Technical documentation - W.E.ST. Elektronik GmbH

W.E.ST. Elektronik GmbH
Technical documentation
PAM-197

W.E.ST. Elektronik GmbH
Inhaltsverzeichnis
Revisions ...................................................................................................................................................... 3
Ordering code ............................................................................................................................................... 3
Accessories .................................................................................................................................................. 3
General description....................................................................................................................................... 4
General installation remarks......................................................................................................................... 5
In- and outputs ..................................................................................................................................... 6
LED Funktion ....................................................................................................................................... 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
S (setpoint parameterization)........................................................................................................... 15
RMODE (ramp- function mode)....................................................................................................... 15
RA (ramptime parameterization)...................................................................................................... 15
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
SENS (sensor monitoring) ............................................................................................................... 19
SOLENOIDS (number of solenoids)................................................................................................ 19
CURRENT (range of the output current) ......................................................................................... 19
DFREQ / DAMPL (dither frequency, dither amplitude).................................................................... 19
PWM (pwm output frequency) ......................................................................................................... 20
PPWM / IPWM (P-gain and i-gain of the current compensator)...................................................... 20
CMODE (function of the output stage) ............................................................................................20
SAVE (data storing in EEPROM)..................................................................................................... 21
LOADBACK (copy of the EEPROM into the active RAM) ............................................................... 21
DEFAULT (parameter reset)............................................................................................................ 21
PROCESS DATA (monitoring) ........................................................................................................ 21
Remarks ..................................................................................................................................................... 22
Seite 2 von 22 12.03.2008

Revisions
W.E.ST. Elektronik GmbH
Datum Modul Revision Kommentar
27.3.2007 7 Hardware based on DigiPAM
Ordering code
PAM-197-1*
Alternative products
PAM-196 - two independent channels for pressure or throttle valves
PAM-195 - for directional valves
* = 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
HHT-302 - Hand held terminal
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: 11.03.07
Revision: 8
The right of changes are reserved.
Seite 3 von 22 12.03.2008

General description
W.E.ST. Elektronik GmbH
This module is used for the control of proportional valves with one or two solenoids (directional valves).
Various adjustable parameters enable an optimized adaptation to the respective valve.
The dynamic integrated power amplifier with a control/cycle time of 0,167 ms is inexpensive and a spacesaving
solution.
The power amplifier is controlled by an enable input and three switch signals. Therefore 8 demand values
can be activated binary. In case of direct control (non binary) it is par example possible to preset the directions
with two inputs and to switch over between rapid and slow speed with the third input. The output
current is closed loop controlled and therefore independent from the supply voltage and the solenoid resistance.
The current output is observed with regard to cable breakdown and over current (short circuit).
Programmable are ramps, MIN and MAX, DITHER (frequency and amplitude) and PWM frequency.
The adjustment via RS232C is simple and easy, so that a short training period can be guaranteed.
Typical applications: Rapid and slow speed controls and digital selectable set points for pressure and flow
rate values.
Features
• For proportional valves with one or two solenoids
• Three switch inputs for the selection of 8 programmed demand values
• Compact housing
• Digital reproducible adjustments
• Characteristic linearization via 10 XY-points per direction
• Free parametering of ramps, MIN und MAX current, Dither (frequency, amplitude)
and PWM frequency
• Adjustment MIN / MAX in mA
• Current range (per software adaptable): 1 A, 1,6 A and 2,6 A
• Simple and application orientated parameter settings
• Fehler Diagnostik und erweiterte Funktionsüberprüfung
• Failure monitoring
• Adjustments via RS232C interface
Seite 4 von 22 12.03.2008

General installation remarks
Explanation of terms and notes on safety
Terms:
W.E.ST. Elektronik GmbH
w: command signal
c: internal signal
u: 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.
Seite 5 von 22 12.03.2008

In- and outputs
W.E.ST. Elektronik GmbH
Terminal Description of the analogue inputs and outputs
PIN 1 / 2 und
PIN 3 / 4
LED Funktion
PWM outputs for solenoid control. Solenoid B,
Solenoid A.
Terminal Description of the analogue 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.
Error conditions are disabling by ENABLE
PIN 6 / 9 / 14 Digital control inputs to retrieve the appropriate setpoints. All setpoints, in a storage
area be deposited, can be linked binary. S1: Pin 6, S2: Pin 9, S4: Pin 14.
setpoint 0: S1 = 0, S2 = 0, S4 = 0
setpoint 1: S1 = 1, S2 = 0, S4 = 0
setpoint 2: S1 = 0, S2 = 1, S4 = 0
setpoint 3: S1 = 1, S2 = 1, S4 = 0
setpoint 4: S1 = 0, S2 = 0, S4 = 1
setpoint 5: S1 = 1, S2 = 0, S4 = 1
setpoint 6: S1 = 0, S2 = 1, S4 = 1
setpoint 7: S1 = 1, S2 = 1, S4 = 1
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.
Seite 6 von 22 12.03.2008

Block diagram
Power supply
12 /24 V
0V
7
8
PAM-197-*
3,5 mm JISC-6560
24 V
DC
0 V
DC
8 V
5 V
RS232 C
9600 Baud
W.E.ST. Elektronik GmbH
3
ia
A
4
A-solenoid
ib
Ramps
ra:i x
W Linearisation C
i = 1... 7
x = 5... 60000 CC:i x y
2
B
1
min:i x
i = A | B
x = 0..5000
max:i x
i = A | B
x = 5000..10000
trigger x
x = 0... 2000
Values
s:i x
i = 1... 7
x = -10000... 10000
13
10
11
CONFIGURATION
mode x (x = ON|OFF)
cmode x (x= ON|OFF)
rmode x (x= SD|4Q)
rcurr x (x= ON|OFF)
sens x (x= ON|OFF)
solenoids x (1|2)
Seite 7 von 22 12.03.2008
B-solenoid
A-solenoid
3
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
x = 0..1500
current: x
x = 0|1|2
Power stage
U
mode = on
Auswahl
Auswahl
12 8 V ref.
4
General commands
Control program
2
B-solenoid
DIAGNOSTICS
din
w, c
u
ia, ib
S1
digital input
S2 9 digital input
6
5
Ready output
Wiring for valves
in three wire technology
(HAWE)
PE via DIN-RAIL
SUPPORT
save
loadback
help
para
default
id
S4 14 digital input
digital input
15
Enable

Typical wiring
Betriebsbereitschaft
operating state
Sollwertauswahl
command value select
S1
S2
S4
-
Schirm /
Screen
W.E.ST. Elektronik GmbH
PE
1
5
9
13
2
6
10
14
0V
Seite 8 von 22 12.03.2008
3
7
11
15
4
8
12
16
PE
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
W.E.ST. Elektronik GmbH
[VDC]
[mA]
[A]
Digital inputs [V]
[V]
Digital outputs [V]
[V]
Reference voltages [V]
[mA]
PWM outputs
max. load
Frequency
Sample time (signal conditioning)
Sample time (current control loop)
12… 30 (inkl. Rippel)
80 + Magnetstrom
3 flink
logik 0: < 2 V
logik 1: > 10 V
logik0: < 2 V
logik 1: > 12 V (50 mA)
Seite 9 von 22 12.03.2008
[A]
[Hz]
[ms]
[ms]
8
5
1,0, 1,6 or 2,6 (per software switchable)
(alternative adjustable in mA steps)
100… 7700 adjustable PWM frequency
1
0,1667
Interface RS 232C, 9600 Baud, 1 stopbit, No parity,
Echo Mode
Housing Snap-On Module EN 50022
Polyamid PA 6.6
Combustibility class V0 (UL94)
Protection class
Temperature range
Humidity
IP
°C
%
Dimensions (width9 [mm] 22,5
20
-20..55

W.E.ST. Elektronik GmbH
General IO description
This description is a general description of the technical data of out open loop and closed loop control
modules. Please check the implemented IO signals via the block diagram about availability.
Power supply
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
ATTENTION: Without an external fuse and in case of a continual short-circuit the
module can be destroyed in spite of all internal protections.
Digital inputs
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: < 2 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: < 2 V
High level: > 10 V
Current: max. 50 mA (with load of 200 Ohm)
Seite 10 von 22 12.03.2008

W.E.ST. Elektronik GmbH
Analogue inputs
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: unipolar 0… 10 V to PIN 9 / PIN 10 and 0…10 V to PIN 13 / PIN 14
input resistance: 100 kΩ
Current level: unipolar 4… 20 mA (PIN 9 to PIN 10 / PIN13 to PIN14)
input resistance: app. 390 Ω
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 “current”
command should not be used.
Seite 11 von 22 12.03.2008

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
Seite 12 von 22 12.03.2008

Parameter table
W.E.ST. Elektronik GmbH
Kommando Parameter Vorgabe Einheit Beschreibung
s:i x i = 0… 7
x = -10000… 10000
- 0,01% Command values depending on the external signal S1, S2 and S4
rmode x x= SD|4Q SD - Ramp function:
SD = ramp time related to the setpoint value
4Q = Four quadrants ramp, ramp-variable RA:1 to RA:4 is used.
ra:i x i= 0… 7
x= 0..600000
100 ms Ramp-time.
4Q Ramp RA:1 up (solenoid A), RA:2 down (solenoid A)
RA:3 up (solenoid B), RA:4 down (solenoid B)
SD Ramp RA:0 to RA:7
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
x= 0..5000
max:i x i= A
x= 300..10000
0
10000
0,01% / mA
0,01% / mA
Deadband compensation of positive overlapped proportional
valves.
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.
sens x x= ON|OFF ON - Activation of the sensor and internal failure monitoring.
solenoids x x= 1|2
current:i x i= A
x= 0, 1, 2
dampl:i x i= A
x= 0..2000
dfreq:i x i= A
x= 60… 400
pwm:i x i= A
x= 100..7700
ppwm:i x
ipwm:i x
x= 1… 20
x= 5… 100
2 - Number of used solenoids. Two for directional valves, one for
pressure or throttle valves.
0
400
120
2600
7
40
-
0,01%
Hz
Hz
-
-
Output current range.
0 = 1,0 A range
1 = 1,6 A range
2 = 2,6 A range
DO NOT USE THIS COMMAND IF RCURR = ON.
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).
Preset of the dither frequency
Preset of the PWM frequency
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
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).
save - - - Storing the programmed parameter in E²PROM.
loadback - - - Reloading the parameter from E²PROM in working RAM
Seite 13 von 22 12.03.2008

W.E.ST. Elektronik GmbH
Kommando Parameter Vorgabe Einheit Beschreibung
din - - - Status of the digital inputs.
id - - - Display the module type, version and revision
w, c, u, ia,
ib
- - 0,01% Actual signals: command value, actual value, process data…
default - - - Preset values will be set.
Seite 14 von 22 12.03.2008

Parameter description
S (setpoint parameterization)
W.E.ST. Elektronik GmbH
Command Parameter Default Unit
s:i x i= 0… 7
x= -10000… 10000
- 0,01%
Depending on the external switching inputs S1, S2 and S4 the programmed values are retrieved.
S1 = Pin 6, S2 = Pin 9 and S4 = Pin14.
preset value -> 0 1 2 3 4 5 6 7
Input S1 0 1 0 1 0 1 0 1
Input S2 0 0 1 1 0 0 1 1
Input S4 0 0 0 0 1 1 1 1
RMODE (ramp mode)
Command Parameter Default Unit
rmode x x= SD|4Q SD -
Selection:
With “SD”: separate ramp for each setpoint.
With “4Q”: general four quadrant ramps. (RA:1 x, RA:2 x, RA:3 x und RA:4 x).
RA (ramptime parameterization)
Commands Parameter Defaults Units
ra:i x I= 0… 7
x= 0..600000
In mode „4Q“ ramp times 1… 4 are activated:
RA: 1 up ramp solenoid A,
RA: 2 down ramp solenoid A,
RA: 3 up ramp solenoid B,
RA: 4 down ramp solenoid B.
See also command „RMODE“.
100 ms
Seite 15 von 22 12.03.2008

MODE (of the linearization)
W.E.ST. Elektronik GmbH
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
-
-
-
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.
Example:
Flow characteristics as a square function.
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
Reihe1
Seite 16 von 22 12.03.2008

W.E.ST. Elektronik GmbH
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.
Seite 17 von 22 12.03.2008
Reihe1

MIN (compensation of the dead zone)
MAX (maximum output signal)
TRIGGER (threshold value of MIN)
W.E.ST. Elektronik GmbH
Command Parameter Default Unit
min:i x
max:i x
trigger x
i= A|B
x= 0… 5000
x= 300… 10000
x= 0… 2000
-
0
10000
200
-
0,01% / mA
0,01% / mA
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
MAX:A
MIN:A
Seite 18 von 22 12.03.2008
Input

SENS (sensor monitoring)
W.E.ST. Elektronik GmbH
Kommando Parameter Vorgabe Einheit
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.
SOLENOIDS (number of solenoids)
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
Solenoids = 2 - directional valves
CURRENT (range of the output current)
Kommando Parameter Vorgabe Einheit
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.
If modus “RCURR” = ON, then this command is not active.
The current range select done automatically.
DFREQ / DAMPL (dither frequency, dither amplitude)
Kommando Parameter Vorgabe Einheit
dfreq x
dampl x
x= 60… 400
x= 0… 1800
120
400
Hz
0,01%
Dither amplitude. Typical values between 500 and 1200 (good experience were made with 700) 2 .
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
2
The current loop compensator is improved in software version 14. The amplitude has to be reduced again older versions.
Seite 19 von 22 12.03.2008

PWM (pwm output frequency)
W.E.ST. Elektronik GmbH
Kommando Parameter Vorgabe Einheit
pwm x x= 100… 3900 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 / IPWM (P-gain and i-gain of the current compensator)
Kommando Parameter Vorgabe Einheit
ppwm:i x
ipwm:i x
x= 0… 20
x= 5… 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

SAVE (data storing in EEPROM)
W.E.ST. Elektronik GmbH
Kommando Parameter Vorgabe Einheit
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)
Kommando Parameter Vorgabe Einheit
loadback - - -
Über dieses Kommando können die Daten vom EEPROM wieder ins RAM zurück geschrieben werden.
Dies ist hilfreich, wenn die aktuelle Reglerparametrierung nicht optimal ist.
DEFAULT (parameter reset)
Kommando Parameter Vorgabe Einheit
default - - -
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.
PROCESS DATA (monitoring)
Kommando Parameter Einheit
w
c
u
ia
ib
Demand value
Control deviation
Actuator signal
output-current valve A
output current valve B
0,01%
0,01%
0,01%
0,01%
0,01%
The process data can be read out now. They show the actual and command values.
Seite 21 von 22 12.03.2008

Remarks
W.E.ST. Elektronik GmbH
Seite 22 von 22 12.03.2008