7
Inspection and maintenance
100
07.2020
ba
-o
.2
.6
.0
-us
-3
.2
-ys
|
A1
18
67
50
1 Re
v A
E
7.8
Hoist motor brake (NM) 4H..-MF
WARNING
Danger of falling load
Carry out work on the hoist brake only when the hoist is unloaded and the bottom hook
block has been set down.
➢
Switch off the main isolation switch and secure against being switched on again!
(1)
Stopping plug
(2)
Stopping plug
(3)
Enclosure upper part
(4)
Stud bolt
(5)
Fan cover
(6)
Stud bolts
(7)
Fanwheel
(8)
Fastening screws
(9)
Coil carrier
(10)
Anchor plate
(11)
Brake rotor
(12)
Hub
(13)
Enclosure lower part
(14)
Retaining ring
(15)
V-ring (IP66)
Fig. 74
7.8.1
Checking the brake
Remove stopping plug from the fan cover.
Remove stopping plug (2) with pliers
Measure the air gap (S) with a feeler gauge (b).
NOTICE
When measuring, ensure that the feeler gauge (b) is slid up to insertion
depth “a” as a minimum and does not become caught on the ledge (!). Refer to the
table for the maximum permissible air gap (S). The brake is not readjustable. Once
the max. permissible air gap (S) has been reached, the brake rotor must be replaced.