Siemens SINAMICS S120 Manual page 44

Motor Modules in booksize C/D-type format
3.2 Safety instructions for Motor Modules of C/D-type
Overheating when the total length of the power cables is exceeded
When the total permissible length of the power cables is exceeded, this can result in
components overheating. Further, the motor insulation can be damaged as a result of the
system vibration. This can cause fire and smoke, which can lead to death or severe injury.
• Ensure that the total length of all power cables (motor supply cable, DC link cable) does
NOTICE
Temperature signal disturbances and failure of components as a result of unshielded or
incorrectly routed cables
With unshielded or incorrectly routed cables, it can be expected that interference will be
coupled into the signal processing electronics from the power side. This can significantly
disturb the motor sensor temperature signal and can result in the failure of individual
components (destruction of the devices).
• Only use shielded cables as temperature sensor cables.
• For temperature sensor cables that are routed together with the motor cable, use only
• Connect the cable shield to the chassis potential at both ends over a large surface area.
NOTICE
Damage to the motor or brake when using an incorrect power supply
With an incorrect power supply, the brake can malfunction, i.e. the brake does not open
reliably. If the motor constantly operates against the closed brake, the brake and/or the
motor will be damaged.
• Always use a stabilized DC power supply to operate motors with a built-in holding brake.
• Take note of the motor holding brake voltage tolerances (24 V ± 10%) and the
• Set the DC power supply to 26 V. This ensures that the supply voltage for the brake
42
WARNING
not exceed the specified permissible length.
cables that are twisted in pairs and shielded separately.
The voltage is supplied via the internal 24 V busbars.
connecting cable voltage losses.
remains within the permissible range when the following conditions are fulfilled:
– Siemens three-phase motors are used
– Siemens MOTION-CONNECT power cables are used
– Motor cable lengths, max. 100 m
Power Units in Booksize C/D-Type Format
Manual, 12/2018, 6SL3097-5AC20-0BP0