Siemens SINAMICS GL150 Operating Instructions & Installation Instructions page 121

● Fiber-optic cables
● Opto-transmitter / opto-receiver
● Suppressor capacitors
Figure 9-7
SINAMICS GL150 6SL38502UM114PA0Z
Operating Instructions Rev.201910281441 EXAMPLE
Replace the fiber-optic cables according to the instructions for laying fiber-optic cables.
Defective snubber circuit capacitors may only be replaced on inserted thyristor electronics.
WARNING
Electric shock hazard
The snubber circuit capacitors are not equipped with discharge resistors. The energy
stored in the capacitors is discharged via a circuit in the thyristor electronics. This circuit is
interrupted when the thyristor electronics are withdrawn.
Voltages of up to several 1000 V can occur and cause an electric shock. This can result in
death, severe injuries and significant material damage.
● In this case you should treat the capacitors as if they were charged.
● Discharge the snubber circuit capacitors. Short-circuit the snubber circuit capacitors
before you withdraw the thyristor electronics.
Thyristor rack position
Maintenance
9.7 Repairs
121