9.4.4.4 Checking the capacitor release
Check the following settings:
● T950
Primary tapping: 400 V + 15%
Secondary side: jumpers 32 – 33
● K950
Measuring-circuit voltage at IN3 (no-load voltage of the C release unit: approx. 320 V)
Switch positions: UNDERLOAD, NO MEMORY (the switches are located at the side).
T1 = 0.1 s
Ue = 30% / release at 180 V
Hysteresis = 5% / enable at 210 V
● K951
Measuring-circuit voltage at IN2
Switch positions: UNDERLOAD, NO MEMORY (the switches are located at the side).
T1 = 0.1 s
Ue = 60% / release at 180 V
Hysteresis = 5% / enable at 202 V
The wiring to the circuit-breaker must be checked according to the circuit diagram.
9.4.4.5 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 143).
● Check the cabling for defects.
● Replace any defective parts immediately.
9.4.4.6 Checking the plug connections.
Regularly check the plug connections to ensure they are seated correctly and the contacts are
not corroded.
Note
The fiber-optic cables for the gating boards must be properly inserted in the connectors.
Maintenance
9.4 Inspection and maintenance
SINAMICS SM150 6SL3845-2NN41-8AD2
140 Operating Instructions Rev.201910281310 EXAMPLE
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