Control Supply Module (Csm); Description - Siemens SINAMICS S120 System Manual

Control Supply Module (CSM)

9.1

Description

The Control Supply Module provides an output voltage of 24 V - 28.8 V DC. The output voltage
can be adjusted using an integrated potentiometer.
The Control Supply Module absolutely requires the AC line voltage for start-up, from which it
continues to be supplied during normal operation. When the power fails, the module
automatically changes over to supply from the DC link. This makes it possible, for example, to
execute retraction movements in the event of a power failure. If the AC line voltage is once again
within the permissible range, the equipment switches back to AC, ensuring that the DC link is
only loaded if the AC is either not available or is not within the permissible range.
The Control Supply Module has an integrated line filter for the AC input (Category C2 according
to IEC 61800-3 for line supplies with grounded neutral point) and a precharging circuit for the
DC link in the device, from which the isolated 24 V voltage is generated.
Note
Start-up of the Control Supply Module from the DC link voltage is not possible to prevent an
uncontrolled start-up with residual voltage at the DC link.
The Control Supply Module has safe electrical separation between the line potential and the DC
link potential. This therefore ensures that the DC link is not unintentionally charged. The Control
Supply Module can therefore remain connected to the supply if the Line Module is galvanically
isolated from the line supply, for example using a line contactor.
The 24 V ground of the Control Supply Module is internally grounded.
The Control Supply Module is air cooled using an internal fan.
Temperature and voltages are internally monitored.
Temperature monitoring:
In the event of an overtemperature in the Control Supply Module, a temperature advance
warning is issued via a signaling contact. If the temperature falls below the limit value within the
advance warning time, then the module remains operational and the signaling contact is de-
energized. If the overtemperature condition persists, the module is switched off and restarted.
Voltage monitoring:
When the monitoring threshold (32 V) of the output voltage is exceeded for > 20 ms, the Control
Supply Module switches off and attempts a restart after 10 s. This is supplemented by a
hardware-based overvoltage limiting. This prevents that more than 35 V can be output in the
case of a fault.
The Control Supply Module can either be operated individually or in a parallel connection with
a maximum of 10 devices. The switchover between single and parallel operation is realized in a
no-current state using a DIP switch on the upper side of the module.
High Frequency Drive
System Manual, 10/2020, 6SL3097-5AH10-0BP0
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