PAM-195-GL - W.E.ST. Elektronische Steuerungen e. K.

W.E.ST. Elektronik GmbH
Technical documentation
PAM-195

W.E.ST. Elektronik GmbH
Table of contents
Revisions ..................................................................................................................................................... 3
Ordering code .............................................................................................................................................. 3
Accessories ................................................................................................................................................. 3
General description ..................................................................................................................................... 4
General installation remarks ........................................................................................................................ 5
In- and outputs .................................................................................................................................... 6
LED function ....................................................................................................................................... 6
Block diagram ..................................................................................................................................... 7
Typical wiring ...................................................................................................................................... 8
Technical Data .................................................................................................................................... 9
Dimensions ....................................................................................................................................... 9
General IO description ...................................................................................................................... 10
Power supply .................................................................................................................................. 10
Digital inputs ................................................................................................................................... 10
Digital outputs ................................................................................................................................. 10
Analogue inputs .............................................................................................................................. 11
PWM outputs .................................................................................................................................. 11
Serial interface ................................................................................................................................ 11
Start-up and commissioning guidelines ..................................................................................................... 12
Parameter table ......................................................................................................................................... 13
Parameter description ............................................................................................................................... 15
EAIN (input signal scaling) .............................................................................................................. 15
AINA (simple input selection) .......................................................................................................... 15
AA (acceleration time) .................................................................................................................... 16
MODE (of the linearization)............................................................................................................. 16
CC (characteristic linearization) ...................................................................................................... 16
RCURR (real current input)............................................................................................................. 17
MIN (compensation of the dead zone) ............................................................................................ 18
MAX (maximum output signal) ........................................................................................................ 18
TRIGGER (threshold value of MIN) ................................................................................................ 18
SOLENOIDS (number of solenoids) ............................................................................................... 19
CURRENT (range of the output current) ......................................................................................... 19
DAMPL (dither amplitude)............................................................................................................... 19
DFREQ (dither frequency) .............................................................................................................. 19
PWM (pwm output frequency) ........................................................................................................ 20
PPWM (P-gain of the current compensator) ................................................................................... 20
IPWM (I-gain of the current compensator) ...................................................................................... 20
CMODE (function of the output stage) ............................................................................................ 20
POL (output polarity) ....................................................................................................................... 21
SENS (sensor monitoring) .............................................................................................................. 21
SAVE (data storing in EEPROM) .................................................................................................... 21
LOADBACK (copy of the EEPROM into the active RAM) ............................................................... 21
DEFAULT (parameter reset) ........................................................................................................... 21
PROCESS DATA (monitoring) ........................................................................................................ 22
Appendix: Remote control ......................................................................................................................... 23
Appendix: S versions ................................................................................................................................. 24
S1 (two flow ranges) ....................................................................................................................... 24
S2 (separate enable signals) .......................................................................................................... 24
S3 (power limitation) ....................................................................................................................... 24
Remarks .................................................................................................................................................... 25
Page 2 of 25

Revisions
W.E.ST. Elektronik GmbH
Date
Module Version/
Revision
Comment
02.01.2006 13 Hardware based on DigiPAM
Additional functions:
improved parameter calculation; eliminated rounding error
improved solenoid current control (CAUTION: the dither
05.12.2006 14-rev 15
amplitude have to be reduced (depending of the valve dynamics))
increased baud rate
remote control
intensity of the yellow LED is related to the current output
24.02.2007 14-rev 16
Hardware protection of the power stage
Ordering code
PAM-195 - for directional valves
Alternative products
PAM-196 - two independent channels for pressure or throttle valves
PAM-197 - with switching inputs (eight selectable command values)
* = Version number, for ordering not necessary. Changes of the last digit (13 to 14) indicate technical improvements
at 100% compatibility. Changes from 13 to 20 indicate significant technical improvements. In
this case check the documentation about the parameter and wiring.
Accessories
RS232-SO - programming cable with RS232C interface
USB-SO - programming cable with USB interface
W.E.ST. Elektronik GmbH
Poststraße 26
D-41372 Niederkrüchten
Fax.: +49 (0) 2163 57 73 55 - 11
Homepage: www.w-e-st.de or www.west-electronics.com
EMAIL: info@w-e-st.de
Date: 20.12.2009
Revision: 10
The right of changes are reserved.
Page 3 of 25

General description
W.E.ST. Elektronik GmbH
This module is used for the control of proportional valves with two solenoids (directional valves). Various
adjustable parameters enable an optimized adaptation to the respective valve. This power amplifier is inexpensive
and a space-saving solution.
The amplifier is controlled by a ±10 V (or 4... 20 mA with 12 mA for the neutral position) signal. The output
current is closed loop controlled and therefore independent from the supply voltage and the solenoid resistance.
Ramps, MIN and MAX, the DITHER (frequency and amplitude) and the PWM frequency are programmable
within a wide range. In addition the valve characteristic can be linearized via 10 XY-points per direction.
For example: by use of pressure valves a linear behaviour between input signal and pressure can be
reached.
The adjustment via RS232C is simple and easy. A standard terminal program, special windows application
software (WPC-300, download from our homepage) can be used.
Typical applications: Control of proportional valves
Features
Power amplifier for proportional directional valves
Compact housing
Digital reproducible adjustments
Characteristic linearization via 10 XY-points per direction
Free parametering of ramps, MIN und MAX current, Dither (frequency, am-
plitude) and PWM frequency
Current range (per software adaptable): 1 A, 1,6 A and 2,6 A
Simple and application orientated parameter settings
Failure monitoring
Adjustments via RS232C interface
Page 4 of 25

General installation remarks
Explanation of terms and notes on safety
Terms:
W.E.ST. Elektronik GmbH
w: command signal
u: internal signal
c: internal signal
ia, ib: output current (not scaled, only for information)
Mounting instructions
This module is for the installation provided in shielded electromagnetic compatibility housing (EMC conform).
All cables operating outside have to be screened. A complete shielding is presupposed. It is also presupposed,
that no strong electrical disturbances near the module are installed.
Typical mounting area: 24V control signal area (near PLC)
By the arrangement of the electrical cabinet a separation between power part (and power cables) and
signal part must be taken in consideration. Experience shows us that the area next to the PLC (24 V
area) is suitable. All digital and analogue inputs and outputs have filters and an over voltage protection. In
case of correct wiring and shielding all EMC demands are fulfilled. If there are nevertheless any problems,
please send us detailed sketches of mounting and wiring. We will look after this problem immediately.
Even if all EMC-norms are fulfilled, technical problems in special cases are possible. Our experience has
shown us that most of these problems are caused in the physical conditions of the cables. If everything is
shielded continuously and configured correctly, no problems have to be expected.
ATTENTION!
ATTENTION!
Due to electrical disturbances, failure at components as well as software faults can cause
in individual cases uncontrolled movements at the drive. Appropriate safety precautions
have to be considered during the engineering.
Connection and start up of the module may only be allowed by qualified persons
who have, because of education, experience and instruction, sufficient
acknowledge on relevant directives and approved technical rules. Please
read and follow the operating instructions carefully. In case of non observance
of the instruction the guaranty and liability claim expires.
Page 5 of 25

In- and outputs
LED function
W.E.ST. Elektronik GmbH
Terminal Description of the analogue inputs and outputs
PIN 9/10 and External command value (V), range ±100 % corresponds to ±10 V
PIN 14/13 or 4… 12… 20 mA
PIN 1/2 and
PIN 3/4
Terminal points for the solenoids. PIN 3/4 A-solenoid, PIN 1/2 B-solenoid
Terminal Description of the digital inputs and outputs
PIN 15 Enable input:
This digital input signal initializes the application. The power output is active and the
READY signal indicates that all components are working correctly.
PIN 6 Free for user specified function:
PIN 5 READY output:
General operational, ENABLE is active and there is no input error (by use of 4… 20
mA input) or solenoid error. This output corresponds with the green LED.
LEDs Description of the LED function
GREEN Corresponding with the READY output.
OFF: No power supply or ENABLE is not activated
ON: System is ready
FLASHING: A failure is detected.
(4… 20 mA input) signal is out of the range or
short cut / broken cable to the solenoids
YELLOW The intensity indicates the rate of output current.
Page 6 of 25

Block diagram
Power supply
PAM-195-*
Voltages input
3,5 mm Cinch
9
12 /24 V
0V
7
8
24 V
Ramp
DC
0 V
RS232 C
9600 Baud
10
DC
8 V
5 V
CMD signal aa:i x
i = 1|2|3|4
x = 0..60000
+
-
10 V... -10 V
W
14
W.E.ST. Elektronik GmbH
3
ia
4
A
A-solenoid
CMODE = OFF
pwm x
x = 80..3900
ipwm x
x = 2..100
ppwm x
x = 0..7
dfreq:i x
i = A | B
x = 60..400
dampl:i x
i = A | B
+
-
13
Current input
U C
Linearisation
CC:i x y
9
2
ib
CMD signal
10
B
4... 20 mA
1
Page 7 of 25
11
B-solenoid
x = 0..1500
3
A-solenoid
min:i x
i = A | B
x = 0..5000
max:i x
i = A | B
x = 5000..10000
4
12 8 V ref.
Power stage
2
General commands
Control program
B-solenoid
6
24 V input
not used
free for S-modifications
CMODE = ON
5
12 / 24 V Ready output
CONFIGURATION
aina x (x = V | C)
mode x (x = ON|OFF)
cmode x (x= ON|OFF)
DIAGNOSTICS
din
xq, xp
wq, qp
z
SUPPORT
save
loadback
help
para
PE via DIN-RAIL
15
Enable
24 V input

Typical wiring
Analoger Sollwert (-10... 10V)
Analogue command signal (-10... 10V)
+ -
W.E.ST. Elektronik GmbH
Schirm /
Screen
PE
1
5
9
13
2
6
10
14
Page 8 of 25
3
7
11
0V
15
4
8
12
16
V ref.
Enable
Magnet B
Solenoid B
Magnet A
Solenoid A
12 V / 24 V
0V
Spannungsversorgung
Power Supply

Technical Data
Power supply
Current consumption
External fuse
Dimensions
WIDTH (see technical data)
W.E.ST. Elektronik GmbH
[VDC]
[mA]
[A]
Digital inputs [V]
[V]
Digital outputs [V]
[V]
Analogue inputs (sensor and command
signals)
Resolution
[V]
[mA]
[%]
Page 9 of 25
10… 30 (incl. ripple)
10 V
logic 0: < 2 V
logic 1: > 10 V (50 mA)
-10… 10; 100 kOhm
4… 12… 20; 390 Ohm
0,025 (incl. oversampling)
Reference voltages [V] 8; 10 mA max.
PWM outputs
max. load
Frequency
Sample time (signal conditioning)
Sample time (current control loop)
Interface
[A]
[Hz]
[ms]
[ms]
1,0, 1,6 or 2,6 (per software switchable)
(alternative adjustable in mA steps)
100… 7700 adjustable PWM frequency
1
0,1667
RS 232C, 9600 Baud, 1 stopbit, No parity, Echo
Mode
Housing Snap-On Module EN 50022
Polyamide PA 6.6
Combustibility class V0… V2 (UL94)
Protection class
Temperature range
Humidity
[IP]
[°C]
[%]
Dimensions (width) [mm] 25,5
20
-20… 60

General IO description
Power supply
W.E.ST. Elektronik GmbH
This module is designed for 10… 30 VDC (typical 12 V or 24 V) of a power supply. This power supply
must correspond to the actual EMC standards.
All inductivities at the same power supply (relays, valves …) must be provided with an over voltage protection
(varistors, free-wheel diodes …).
It is recommended to use a regulated power supply (linear or switching mode) for the supply of the module
and the sensors. These power supplies have a clearly lower internal resistance in comparison with
non regulated power supplies and therefore a better spurious rejection.
Power supply : 10… 30 VDC, incl. ripple
Power consumption: 100 mA + solenoid current consumption
External protection: 5 A fast
Digital inputs
ATTENTION: Without an external fuse and in case of a continual short-circuit the
module can be destroyed in spite of all internal protections.
The digital inputs are designed for a voltage level of 12 V and 24 V. The typical connections to the PLC
will not be screened if the modules are arranged carefully and with short cable lengths. As common potential
0V (PIN 4) is used.
All inputs are protected with suppressor diodes and RC-filters against transient overshoots.
Low level: < 4 V
High level: > 10 V
Current: < 0,1 mA
Digital outputs
The digital outputs are designed for a voltage level of 12 V and 24 V. The typical connections to the PLC
will not be screened if the modules are arranged carefully and with short cable lengths. As common potential
0V (PIN 4) is used.
All outputs are protected with suppressor diodes and RC-filters against transient overshoots.
Low level: < 4 V
High level: > 10 V
Current: max. 50 mA (with load of 200 Ohm)
Page 10 of 25

Analogue inputs
W.E.ST. Elektronik GmbH
The analogue inputs are designed for a maximum voltage range of 10 V. The voltage input is typically
±10 V and the current input is 4… 20 mA with 12 mA for the center position of the directional valve.
The inputs are protected with suppressor diodes (level 33 V) and RC-filter against transient overshoots.
All analogue inputs must be screened.
Differential input:
Voltage level: bipolar ±10 V (PIN 9 / PIN 10 and parallel PIN 14 / PIN 13)
unipolar 0… 10 V to PIN 9 / PIN 10 and separate 0… 10 V to PIN 13 /
PIN 14
input resistance: 100 k
Current level: unipolar 4… 20 mA (PIN 9 to PIN 10)
input resistance: app. 390
Cable break down are monitored via the READY output and a flashing
green LED.
PWM outputs
The output current is controlled via closed loop PWM current controller with PI characteristics. For high
flexibility PWM frequency, dither frequency, dither amplitude and the PI compensator are free configurable.
Cable break down and short cuts are monitored via the READY output and a flashing green READY
LED.
The outputs are protected with suppressor diodes (level 33 V) and RC-filter against transient overshoots.
PWM:
Output current: max. 2,6 A 1
Frequency: 100… 7700 Hz
Serial interface
The serial interface is chosen for the parametering with a PC or a notebook. A suitable cable of 3,5mm
JISC-6560 plug to 9pol. RS232 (PC compatible) can be bought under RS232-SO.
You can parameterize our modules with each terminal program. However, by use of our application software
WPC-300 you have enlarged functions and therefore it is preferable.
Download: WWW.WEST-ELECTRONICS.COM or WWW.W-E-ST.DE
Features:
Table orientated parametering
Saving and loading of the parameter sets
Process data monitoring
Oscilloscope for dynamical optimization of the control parameters
Terminal window for flexible data input
1 The output current can be adjusted in % of the rated current or directly in mA. In case of mA adjustment, the “cur-
rent” command should not be used.
Page 11 of 25

W.E.ST. Elektronik GmbH
Start-up and commissioning guidelines
1. The module must be mounted and wired with attentions to EMC requirements. A star orientated
ground connection should be used when other power consumers are sharing the same power
supply. Following points have to be taken in account for wiring:
Signal cable and power cable have to be wired separately.
Analogue signal cables must be screened.
Other cables should be screened in case of strong electrical disturbance (power relays,
frequency controlled power driver) and cable lengths > 3m. With high frequency EMI inexpensive
ferrite elements can be used. In this typical configuration of installation (see
point 2 to 4), no extra step should be taken in consideration.
2. By the arrangement of the electrical cabinet a separation between the power part (and power
cables) and signal part must be taken in consideration. Experience shows us that the area next to
the PLC (24 V area) is suitable.
3. Low impedance between PE “protected earth” and DIN-Rail should be used. Transient interference
voltages at the terminals are discharged via DIN-Rail to the local PE. The screens have to
be connected directly next to the module via PE terminals.
4. The power supply should be carried out voltage regulated (i. e. PWM controlled). The low impedance
of controlled power supplies facilitates improved interference damping. Therefore the signal
resolution will be increased. Switched inductance (relays and solenoids) operating from the same
power supply has to be damped by surge protection elements directly by the inductance.
5. No plugs with freewheeling diodes, LEDs or other electronics should be used. The freewheeling
diode is integrated in the power stage of the module.
Caution: Using of electronic components in the plugs will destabilize the current
control loop. The power stage can be damaged.
Page 12 of 25

Parameter table
W.E.ST. Elektronik GmbH
Commands Parameter Defaults Units Description
ain a b c x
a= -10000… 10000
b= -10000… 10000
c= -10000… 10000
x= V|C
: 10000
: 10000
: 0
: V
-
-
0,01%
-
Page 13 of 25
…
Analogue output selection. W and X for the inputs and V = voltage,
C = current. With the parameters a, b and c the inputs can be scaled
(output = a / b * (input - c)).
Because of the programming of the x-value (x = C) the corresponding
input will be switched over to current automatically.
aina x x= V|C V - Simple input selection: V is used for voltages input (+/- 10 V) and C
is used for current input (4… 20 mA).
aa:i x i= 1… 4
x= 5… 60000
: 100
ms
Ramp times depending on the relevant quadrant. 1 and 2 are used
for solenoid A and 3 and 4 are used for solenoid B.
mode x x= on|off off - Activation or deactivation of the linearization defined by the CC
command.
cc:i x y i= -10… 10
x= -10000… 10000
y= -10000… 10000
-
-
-
-
0,01%
0,01%
Characteristic linearization.
rcurr x x= on|off off - Real current input. MIN and MAX will be typed in, in mA. If rcurr = on;
the command “current” should not be used.
min:i x i= A|B
x= 0… 5000
max:i x i= A|B
x= 300… 10000
:A 0
:B 0
:A 10000
:B 10000
0,01%
0,01%
0,01%
0,01%
Deadband compensation of positive overlapped proportional valves.
Good adjustment will increase positioning accuracy.
Maximum output range for adapting control range to maximum flow
range.
trigger x x= 0… 2000 200 0,01% Point to activate the deadband compensation (min). Also useful for
reduced sensitivity in position with control valves.
solenoids x x= 1… 2 2 - Number of used solenoids.
2-for directional valves,
1-for pressure or throttle valves 2 .
current x x= 0… 2 0 - Output current range.
0 = 1,0 A range
1 = 1,6 A range
2 = 2,6 A range
dampl x x= 0… 3000 400 0,01% Parametering of the dither amplitude in 0,01 % units of the nominal
current range. Typical values between 500 and 1200 (with 700 we
always had good experience).
dfreq x x= 60… 400 120 Hz Preset of the dither frequency
pwm x x= 100… 7700 2600 Hz Preset of the PWM frequency
ppwm x x= 1… 30 7 - P-gain for control dynamics of the current control loop. Changing of
these parameters should only be done by expert know how. A higher
P-gain increases the control dynamics of the current control and also
the effect of the dither adjustment
ipwm x x= 1… 100 40 - I-gain for control dynamics of the current control loop. Changing of
these parameters should only be done by expert know how
cmode x x= on|off on - Function of the output stage:
OFF: function for closed loop positioning drives,
ON: standard and for only one return line by two solenoids (HAWE
valves).
pol x x= +|- - - Changing of the output polarity.
sens x x= on|off on - Activation of the sensor and internal failure monitoring.
2 Attention: in case of current input and throttle/pressure solenoids the range of 12… 20 mA is used only.

W.E.ST. Elektronik GmbH
Commands Parameter Defaults Units Description
save - - - Storing the programmed parameter in E²PROM.
loadback - - - Reloading the parameter from E²PROM in working RAM
din - - - Status of the digital inputs.
w, c, u, ia, ib - - - Actual signals: command value, actual value, process data…
default - - - Preset values will be set.
Page 14 of 25

Parameter description
EAIN (input signal scaling)
W.E.ST. Elektronik GmbH
Commands Parameter Defaults Units
ain:i a b c x i= W|X
a= 0… 10000
b= 0… 10000
c= -10000… 10000
x= V|C
: 1000
: 1000
: 0
: V
THIS COMMAND WILL BE IMPLEMENTED IN FUTURE VERSION 3 .
Page 15 of 25
-
-
0,01%
-
With this command each input can be scaled individually. For the scaling function the following linear
equation is taken.
y
a
b
x
x is the input signal and y is the output signal.
At first the offset (c) will be subtracted (in 0,01% units) from the input signal, then the signal will be multiplied
with factor a / b. a and b should always be positive. With these both factors every floating-point value
can be simulated (for example: 1.345 = 1345 / 1000).
With the x parameter value the internal measuring resistance for the current measuring (0… 20 mA or
4… 20 mA) will be activated (V for voltages input and C for current input).
AIN:xx a b c x
i with voltage: AIN:i 1000 1000 0 V
i with current: AIN:i 1250 1000 2000 C
AINA (simple input selection)
c
Commands Parameter Defaults Units
aina x x= V|C V -
Simple input selection by presetting the values a, b, c and x of the AIN command.
V = voltage input ± 10 V
C = current input 4… 20 mA, 12 mA is the neutral position (0% output signal).
3 This scaling function will be implemented in version 15.

AA (acceleration time)
W.E.ST. Elektronik GmbH
Commands Parameter Defaults Units
aa:i x i= 1|2|3|4
x= 5… 60000
100
This parameter is set in ms 4 .
The ramp function is defined by the four quadrants for extending and retracting of a hydraulic axis.
aa:1 acceleration (ramp up) for the A solenoid output
aa:2 deceleration (ramp down) for the A solenoid output
aa:3 acceleration (ramp up) for the B solenoid output
aa:4 deceleration (ramp down) for the B solenoid output
MODE (of the linearization)
Commands Parameter Defaults Units
mode x x= ON|OFF OFF -
This command ist used for activation or deactivation of the characteristic linearization defined by the CC
command. To test the linearization it can be useful to deactivate this function.
CC (characteristic linearization)
Commands Parameter Defaults Units
cc:i x y i= -10… 10
x= -10000… 10000
y= -10000… 10000
-
-
-
Page 16 of 25
ms
0,01%
0,01%
A user defined characteristic can be used by this function.
The characteristic linearization defines positive values for the linearization of channel A and negative values
for channel B. Ten XY-points per solenoid are possible.
Every curve function is calculated according to the equation (linear interpolating between the points: y=(xx1)*(y1-y0)/x1-x0)+y1)
.
With the command MODE ON|OFF the linearization function can be activated or deactivated. The characteristic
between the input and the function CC can be considered by the process variables U to C in the
monitor / oscilloscope.
Caution: The table must be filled completely always from the top (10 then 9 then 8… and/or -10 then -9
then -8…). The lower unused range can be filled with cc:i 0 0.
4 A small deviation by long ramp times is possible. Typical failure by 20 seconds are: app. 0,02% (4 ms). This devia-
tion is caused by the internal limited variables.

Example:
Flow characteristics as a square function
W.E.ST. Elektronik GmbH
Command X-value Y-value
CC: -10 -10000 -10000
10000
CC: -9 -9000 -8100
CC: -8
CC: -7
-8000
-7000
-6400
-4900
7500
CC: -6 -6000 -3600
CC: -5 -5000 -2500
5000
CC: -4 -4000 -1600
CC: -3
CC: -2
-3000
-2000
-900
-400
2500
CC: -1 -1000 -100
CC: 0 0 0
0
CC: 1 1000 100 -10000 -7500 -5000 -2500 0 2500 5000 7500 10000
CC: 2
CC: 3
2000
3000
400
900
-2500
CC: 4 4000 1600
CC: 5 5000 2500
-5000
CC: 6 6000 3600
CC: 7
CC: 8
7000
8000
4900
6400
-7500
CC: 9 9000 8100
CC: 10 10000 10000 -10000
Page 17 of 25
Reihe1
Flow characteristics for compensation of non linear valve characteristics with limitation of the output in B.
Command X-value Y-value
CC: -10 -10000 -6000
10000
CC: -9 -8100 -6000 -9000
CC: -8
CC: -7
-6400
-4900
-6000
-6000
7500
CC: -6 -3600 -6000
CC: -5 -2500 -5000
5000
CC: -4 -1600 -4000
CC: -3
CC: -2
-900
-400
-3000
-2000
2500
CC: -1 -100 -1000
CC: 0 0 0
0
CC: 1 100 1000 -10000 -7500 -5000 -2500 0 2500 5000 7500 10000
CC: 2
CC: 3
400
900
2000
3000
-2500
CC: 4 1600 4000
CC: 5 2500 5000
-5000
CC: 6 3600 6000
CC: 7
CC: 8
4900
6400
7000
8000
-7500
CC: 9 8100 9000
CC: 10 10000 10000 -10000
RCURR (real current input)
Commands Parameter Defaults Units
rcurr x
x= ON|OFF OFF -
This parameter is activating the real current function for MIN and MAX input.
If rcurr = on; the minimum and maximum values are defined in mA.
Reihe1

MIN (compensation of the dead zone)
MAX (maximum output signal)
TRIGGER (threshold value of MIN)
W.E.ST. Elektronik GmbH
Commands Parameter Defaults Units
min:i x
max:i x
trigger x
i= A|B
x= 0… 5000
x= 300… 10000
x= 0… 2000
-
0
10000
200
Page 18 of 25
-
0,01%
0,01%
0,01%
With this command, the output signal is adjusted to the valve characteristics.
MIN:B
MAX:B
ATTENTION: If the MIN value is set too high, it influences the minimal velocity, which
cannot be adjusted any longer. In extreme case this causes to an oscillating around the
closed loop controlled position.
Output
TRIGGER
standard deadband
compensation
Input
MAX:A
MIN:A

SOLENOIDS (number of solenoids)
W.E.ST. Elektronik GmbH
Commands Parameter Defaults Units
solenoids x
x= 1… 2 2 -
If this module is used with a throttle or pressure valve solenoid A should be used only.
This command is used to switch off the internal monitoring of solenoid B.
Solenoids = 1 - throttle or pressure valve (See Note 2)
Solenoids = 2 - directional valves
CURRENT (range of the output current)
Commands Parameter Defaults Units
current x
x= 0, 1, 2 0 -
Selection of the output current range: 0 = 1,0 A range, 1 = 1,6 A range and 2 = 2,6 A range.
DAMPL (dither amplitude)
Commands Parameter Defaults Units
dampl x
x= 0… 3000 400 0,01%
Dither amplitude. Typical values between 500 and 1200 (good experience were made with 700) 5 .
DFREQ (dither frequency)
Commands Parameter Defaults Units
dfreq x
x= 60… 400 120 Hz
Dither frequency. Typical values are between 60 and 200 (good experience were made with 125).
The dither amplitude and the dither frequency are adjustable. With the dither setting the valve hysteresis
can be reduced clearly. The dates for the dither setting can often be taken from the valve dates.
The dither amplitude should be as high as possible, but the drive should not vibrate.
Caution: Too high dither amplitude can lead to an increased attrition (the friction in the
valve reduces a short start phase).
Caution: If the PWM frequency is lower than 500 Hz, the dither amplitude should be set to
zero. In this case the low PWM frequency is used to reduce the valve hysteresis
5 The current loop compensator is improved in software version 14. The amplitude has to be reduced again older ver-
sions.
Page 19 of 25

PWM (pwm output frequency)
W.E.ST. Elektronik GmbH
Commands Parameter Defaults Units
pwm x
x= 100… 7700 2600 Hz
PWM frequencies of ≥2000 Hz improve the current loop dynamics. PWM frequencies in the range of
100… 500 Hz will be used for low dynamic valves with high hysteresis. In this case, DAMPL must be
zero.
Caution: In some cases PPWM and IPWM should be adapted for the low current loop dynamics.
PPWM (P-gain of the current compensator)
IPWM (I-gain of the current compensator)
Commands Parameter Defaults Units
ppwm x
ipwm x
x= 1… 30
x= 1… 100
7
40
PI-compensator used for the current control function. Changes should be only done with good experience
in optimizing of current loops.
In cases of a PWM-frequency >2500 Hz; PPWM can be increased to 7… 15 (typical values: PPWM = 7
and IPWM = 40).
In cases of a PWM-frequency

POL (output polarity)
W.E.ST. Elektronik GmbH
Commands Parameter Defaults Units
pol x x= +|- + -
The output polarity of the controller can be switched over.
SENS (sensor monitoring)
Commands Parameter Defaults Units
sens x x= ON|OFF ON -
The sensor monitoring can be activated. The output current to the solenoids and the input signal (in case
of 4… 20 mA) are monitored.
SAVE (data storing in EEPROM)
Commands Parameter Defaults Units
save - - -
Every parameter change is immediately active but only saved in RAM. For permanent storing in
EEPROM the command SAVE is used to copy the parameter from RAM into EEPROM memory.
LOADBACK (copy of the EEPROM into the active RAM)
Commands Parameter Defaults Units
loadback - - -
With this command, the data will be written back from EEPROM to RAM. This is helpful when the previous
control parameter (before the last saving) will be reactivated.
DEFAULT (parameter reset)
Commands Parameter Defaults Units
default - - -
Reset of all parameters to the set in factory definition. Data not stored in EEPROM.
Page 21 of 25

PROCESS DATA (monitoring)
W.E.ST. Elektronik GmbH
Commands Parameter Units
w
Demand value
0,01%
x
Actual value
xw
Control deviation
v
Velocity
u
Actuator signal
The process data can be read out now. They show the actual and command values.
Page 22 of 25

Appendix: Remote control
W.E.ST. Elektronik GmbH
Description of the general REMOTE CONTROL function
The different modules can be directly controlled via the serial interface. All analogue command and digital
switching inputs can be emulated.
Commands:
RC:M 0|1 Activation / Deactivation of the remote function (0 = deactivated)
RC:S 0… 255 Emulation of the digital switching inputs
0 = PIN 8 (ENABLE) (bit value = 1)
1 = PIN 7 (START / RUN) (bit value = 2)
2 = PIN 5 () (bit value = 4)
3 = PIN 6 (Enable B for power amplifier) (bit value = 8)
4 = PIN 13 () (bit value = 16)
5 = PIN 14 () (bit value = 32)
6 = PIN 15 (Enable … only for power amplifier) (bit value = 64)
7 = … (bit value = 128)
RC:910 x Emulation of the command signal PIN 9 / PIN 10.
RC:6 x Emulation of the command signal PIN 6.
RC:13 x Emulation of the command signal PIN 13.
RC:14 x Emulation of the command signal PIN 14 / PIN 13 (only for PAM-196).
RC:29 x Emulation of the command signal PIN 29 (only for pump control modules).
Example (POS-123A): Setting of ENABLE and START „RC:S 3“.
Setting of the target position (75% of full stroke) “RC:13 7500”.
Page 23 of 25

Appendix: S versions
Description of customized adaptations
S1 (two flow ranges)
W.E.ST. Elektronik GmbH
THIS FUNCTION IS ACTUALLY IMPLEMENTED IN THE STANDARD VERSION TOO.
PIN 6 is used to deactivate the output current ratio defined by the command S1.
PIN 6 = off, S1 = 5000 (50 %); the output current is 50% of the nominal current.
PIN 6 = on, S1 = 5000 (50 %); the nominal current range is active.
Commands Parameter Defaults Units
S1 x
S2 (separate enable signals)
x= 0… 10000 5000 0,01%
Separate ENABLE signals for each direction.
S3 (power limitation)
Power limitation by reducing the flow rate depending of the actual pressure.
Page 24 of 25

Remarks
W.E.ST. Elektronik GmbH
Page 25 of 25