● Fiber-optic cables
Replace the fiber-optic cables according to the instructions for laying fiber-optic cables.
● Opto-transmitter / opto-receiver
● Suppressor capacitors
Defective snubber circuit capacitors may only be replaced on inserted thyristor electronics.
WARNING
High snubber circuit capacitor voltages
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is interrupted when the thyristor electronics are withdrawn.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.
Figure 9-9 Thyristor rack position
9.6.10.2 Replacing thyristor electronics
DANGER
Non-observance of the five safety rules
Non-observance of the five safety rules can cause death or serious injury. Serious material
damage can also result.
Observe the five safety rules. Work must only be performed on adequately grounded power
circuitry.
Maintenance
9.6 Repairs
SINAMICS GL150 6SL38503UM114PA0Z
Operating Instructions 04/2017 125
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