7. Reinstall the new differential pressure monitor in the cabinet. Reconnect the cables and air
hose.
8. After replacing the differential pressure monitor, adjust the switching point.
Setting the switching point
Set the switching point for the differential pressure during commissioning. Select the switching
point so that when a fan is switched off, this will cause the differential pressure switch to trip
after approximately 3 seconds. As a minimum, set differential pressure values of 500 Pa.
9.7.5 Replacing contactors
CAUTION
Injury when using incorrect contactors
Use of the wrong contactor can result in a malfunction and thus lead to physical injuries and
material damage.
● Always use contactors of the same type. Check the device numbers of the previous and
new contactors.
To replace the contactors, proceed as follows:
1. Loosen the cables. To do so, unscrew the screws.
2. Remove the contactor from the DIN rail.
3. Snap the new contactor onto the DIN rail.
4. Reattach the cables. Adhere to the markings. Do not interchange the cables.
5. Re-connect the protective circuit after replacing a contactor. Refer to the circuit diagrams to
help you. You will find these in the section headed "Overview diagram, circuit diagram,
terminal diagram" in the "Power Unit Circuit Manual".
9.7.6 Replacing the coupling unit
To replace the coupling unit, proceed as follows:
1. Disconnect all terminals.
2. Remove the Teflon cable.
3. Undo the mounting screws in the defective coupling unit.
4. Replace the coupling unit.
5. Screw the new unit into position.
6. Connect up the Teflon cable.
7. Reconnect all the terminals.
Maintenance
9.7 Repairs
SINAMICS SL150 6SL38600UL432AA0Z
Operating Instructions Rev.201910281433 EXAMPLE 91
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