Commissioning and operation
6
j
| BA 14.0190 - EN | 02/2007
32
6.1.2
Microswitch - release check
Danger!
The brake must be free of residual torque. The motor must not rotate.
Danger!
Live connections must not be touched.
Connection diagram: (
29)
1. Remove two bridges from the motor terminals.
– Do not switch off the DC brake supply.
2. The switching contact for the brake must be open.
3. Apply DC voltage to the brake.
4. Measure the AC voltage at the motor terminals. It must be zero.
5. Close the switching contact for the brake.
6. Measure the AC voltage at the motor terminals.
– It must be the same as the mains voltage.
7. Measure the DC voltage at the brake:
– The DC voltage measured after the overexcitation time (see bridge/half-wave
rectifier) must be half the voltage indicated on the nameplate. A 10 % deviation is
permissible.
8. Check air gap ”s
Lü”
.
– It must be zero and the rotor must rotate freely.
9. Open the switching contact for the brake.
10. Bolt bridges to the motor terminals.
