Maintenance/repair
7
i
j
| BA 14.0190 - EN | 02/2007
37
7.2.3
Release / voltage
Danger!
The running rotor must not be touched.
Danger!
Live connections must not be touched.
1. Observe air gap ”s
Lü
” during operation of the drive.
2. 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.
7.3
Maintenance operations
7.3.1
Readjustment of air gap
Danger!
Disconnect voltage. The brake must be free of residual torque.
Stop!
Observe for the flange version when it is fixed with additional screws:
Behind the threaded holes for the screws in the flange there must be clearing
holes in the endshield. Without clearing holes the minimum rotor thickness
cannot be used. Under no circumstances may the screws be pressed against
the endshield.
1. Unbolt screws (Fig. 9).
2. Screw the threaded sleeves into the stator by using a spanner.
1
/
6
revolution reduces
the air gap by approx. 0.15 mm.
3. Tighten screws (for torques see table chapter 3.3).
4. Check the air gap ”s
Lü
” near the screws using a feeler gauge (”s
Lürated
” see table
chapter 3.3).
5. If the difference between the measured air gap and ”s
Lürated
” is too large, repeat the
readjustment.
