Coil Suppression - Siemens SIKOSTART 3RW34 Instructions De Service

Installation
Fig. 10 : Overtemperature Switch Mounting for 3RW3486
5.7

Coil Suppression

Relay, electromechanical brake, or solenoid coils produce electrical noise transients (especially when being
de-energized) which can be coupled into the controller circuitry and cause erratic operation. For all such devices
connected to or near the soft starter or its wiring, see Fig. 11 and observe the following.
24 V DC Coils. Connect a diode directly across each DC coil. A standard diode (e.g. 1N4004) is acceptable for most
24 V DC applications up to 1.0 A.
The control outputs are semiconductor (solid-state) outputs. Applying
improper control voltage and/or frequency can damage the control circuits.
Use control circuits only at the rated voltage and frequency. 24 V DC models
have solid-state FET outputs and should not be used on AC circuits.
Alternately, 115 V AC & 230 V AC models have triac outputs and should not be
used on DC circuits.
+
Fig. 11 : Inductive Load Suppression
12
Hazardous voltage.
Can cause death, serious injury,
or property damage.
To prevent electrical shock or burns, do not leave
foreign objects (wire clippings, metal chips, etc.) either
inside or on top of the controller during mounting
procedures.
Order No.
3RW3486-....
End with
No Fans
Overtemperature Switch
Assembly
CAUTION
DC Coil
Switch
+
24 V
DC
WARNING
Switch
120/230 V
AC
AC Coil
220 Ohm
1/4 Watt
0,47 µF,
600 V DC/
230 V AC
3ZX1012-0RW34-1AN1