Commissioning and operation
6
i
j
| BA 14.0190 - EN | 02/2007
33
6.1.3
Microswitch - wear check
Danger!
The brake must be free of residual torque. The motor must not rotate.
Danger!
Live connections must not be touched.
1. Remove two bridges from the motor terminals. Do not switch off the DC voltage for
the brake. When connecting the rectifier to the neutral point of the motor, the PE
conductor must also be connected to this point.
2. Set air gap to ”s
Lümax.
”
. See chapter 4.3.2 Step 8-11.
3. Connect the mains supply.
4. Measure the AC voltage at the motor terminals and the DC voltage at the brake. Both
must be zero.
5. Disconnect the mains supply.
6. Set air gap to ”s
Lürated
”. See chapter 4.3.2 Step 8-11.
7. Connect the mains supply.
8. Measure the AC voltage at the motor terminals. It must be the same as the mains
voltage.
9. 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.
10. Check air gap ”s
Lü
”. It must be zero and the rotor must rotate freely.
11. Switch off the current for the brake.
12. Bolt bridges to the motor terminals. Remove additional PEN conductor.
