4. Disconnect the 3-pole shielded cables for the test signal, as well as the yellow-green ground
cable ②.
5. Remove the screws ③ connecting the current transformer to the bars.
6. Remove the current transformer from the cabinet.
Installing the current transformer
To install the current transformer, proceed as follows:
1. Carry out the removal steps in reverse order.
2. Screw the screws into the busbars with a tightening torque of 25 Nm.
3. After installing the current transformer, check that it works properly.
9.7.9 Replacing the thyristor electronics and thyristors
9.7.9.1 Check components of the thyristor assembly
In the event of a thyristor assembly failing, establish which component has failed:
● Thyristor (by resistance measurement)
When a thyristor fault message is output, the fault value indicates which thyristor is affected.
Check the thyristor resistance while it is installed.
● Thyristor electronics (by replacement)
Send the replaced thyristor electronic boards to the manufacturer for testing.
● 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
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interrupted when the thyristor electronics are withdrawn.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.
Maintenance
9.7 Repairs
SINAMICS SL150 6SL38600UL432AA0Z
Operating Instructions Rev.201910281433 EXAMPLE 93
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