7. Tighten the water hoses with a torque of 1.5 Nm.
8. Screw the electrical cables
①
back to the resistor.
Note
Recommissioning
Operate the water circuit for at least two hours to remove the air bubbles from the system.
9.6.2
Replacing the snubber circuit capacitor
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when the thyristor electronics are withdrawn.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 always handle the capacitors as if they were charged.
● Discharge the snubber circuit capacitors. Short-circuit the snubber circuit capacitors
before you withdraw the thyristor electronics.
Use heat-stabilized cable ties for fixing the capacitors in place. Tighten the capacitor terminals
with the following torques.
Table 9-2
Torques of the capacitor connections
Nuts
Tightening torque
M8
5 Nm
M12
10 Nm
Maintenance
9.6 Repairs
SINAMICS SL150 6SL38655UM427AA02
Operating Instructions Rev.201910281507 EXAMPLE
75
