9.4.1.5 Checking the cable and screw terminals
● Check the cable and screw terminals regularly to ensure that they are secure.
● Tighten the screws if necessary. When doing this, comply with the specified torques
(Page 70).
● Check the cabling for defects.
● Replace any defective parts immediately.
9.4.1.6 Checking the thyristor electronics
● Check the thyristor electronics for contamination. Carry out this inspection when you service
the valves.
● Check whether the components are showing signs of failure. Examples of failure symptoms:
– Irreparable damage
– Traces of smoke
– Scorching
● Check the circuit boards with regard to the following criteria:
– Interruptions
– Short-circuits
– Minimum clearances
– Traces of smoke
– Scorching
See also
Cleaning (Page 115)
9.4.1.7 Checking the filter mats
● Check the air filters in the cabinet doors for pollution.
● Clean the filter mats or replace them if the air flow is obstructed.
See also
Cleaning (Page 115)
Replacing filter mats (Page 113)
Maintenance
9.4 Preventive maintenance
SINAMICS GL150 6SL38503UM114PA0Z
Operating Instructions Rev.201910301420 MUSTER 109
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