Speedfax 2017

For Operation in the Control Cabinet
3RW Soft Starters
Project Planning aids
Main circuit
Possibility 3a:
Inline circuit with ramp-down function DC braking 3)
(for device types 3RW44 22 to 3RW44 25)
Control circuit
Possibility 3a:
Control of the DC braking contactor 3)
L1
L2
L3
3/N/PE 400 V AC 1) , 50 Hz
L1
1/N/PE 230 V AC 1) , 50 Hz
Q1
F2
+24 V DC
PLC output
F3
L1 L2 L3
(optional
semiconductor
protection)
M
Start 2)
Reset
PTC type A or
Thermoclick
Q11
T1 T2 T3
Q91
No action
No action
Reset
Soft Starter
Control
M1
PE
Q91
2
U1 V1 W1
M
3~
Q91
NSB0_01501b
Q91
PE
N
Q11
A1
L+ L- IN1 IN2 IN3 IN4
PE
DC braking contactor 3)
96
A2 13 14 23 24 33 34 95 98
Switch-on duration Q91 No action Group error
T1
+
T2
NSB0_01502a
Main circuit
Possibility 3b:
Inline circuit with ramp-down function DC braking 3)
(for device types 3RW44 26 to 3RW44 47)
Control circuit
Possibility 3b:
Control of the DC braking contactor 3)
L1
L2
L3
Q1
3/N/PE 400 V AC 1) , 50 Hz
L1
1/N/PE 230 V AC 1) , 50 Hz
F2
+24 V DC
PLC output
17
CONTROL
PRODUCTS
F3
Q11
L1 L2 L3
T1 T2 T3
(optional
semiconductor
protection)
M
Motor right
PS 1
Start 2)
No action
No action
Reset
Reset
PTC type A or
Thermoclick
M1
PE
Q91 Q92
3 3
U1 V1 W1
M
3~
NSB0_01503b
K4
Q92
Q91
K4
Q91
Q92
PE
Q11 A1 L+ L- IN1 IN2 IN3 IN4
PE
DC braking contactor 3)
96
A2 13 14 23 24 33 34 95 98
Switch-on duration
4)
K4
N
No action
Group error
T1
+
T2
NSB0_01504a
1) Permissible values for main and control voltage, see
"Technical specifications".
2) Caution: Risk of restarting!
The start command (e. g. from the PLC) must be reset prior to a reset command
because a new, automatic restart will take place automatically if a
start command is active after the reset command. This applies especially
in case of motor protection tripping.
For safety reasons we recommend incorporating the group error output
(terminals 95 and 96) in the controller.
3) If the ramp-down function "Combined braking" is selected, no braking contactor
is required.
If the ramp-down function "DC braking" is selected, a braking contactor
must be used in addition. For type see "Fuse Assignment (Inline Circuit)"
on pages 17-238 to 17-240.
For applications with large centrifugal masses (J Load > J Motor ) we recommend
the function "DC braking".
The output 2 must be switched over to "DC braking contactor".
4) Auxiliary relay K4, e. g.:
LZX:RT4A4T30 (230 V AC rated control supply voltage),
LZX:RT4A4S15 (115 V AC rated control supply voltage).
17-292
Siemens Industry, Inc. SPEEDFAX Product Catalog