Novenco ZerAx axial fan types AZL-AZN-AZW
– Installation and maintenance
17 of 30
6.7 Motor removal
Switch off the power and disconnect the motor cable in the terminal box, before
beginning work on the rotor and motor.
For fans with PM motors, make sure the motor axles cannot rotate during service, e.g.
by blocking the fan rotors. PM motors can generate high voltages when the motor axles rotate,
even though the power is disconnected.
The below procedure is with reference to figures 12 and 13 beginning on page 26.
Motor removal
1.
Dismount any ducts on the inlet and outlet sides.
2.
Remove the screws (figure 12, comp. 1) that hold the hub
cap and remove the cap (figure 12, comp. 2).
3.
Remove the rotor centre bolt and washers (figure 12,
comp. 3).
4. Fans with hub clips:
Remove the hub clip, screws and
washers (figure 12, comp. 4).
5.
Dismount the rotor with a puller fastened in the threaded holes of the hub boss (figure 12,
comp. 5). See also figure 13.
“Mounting of puller in Ø350 hubs with hub clips” on page
6.
Disconnect the motor cable from the motor.
7.
Support the motor. See the technical fan specifications from the AirBox program.
Motor
size
Poles
Lubrication
intervals [hours]
50 Hz
60 Hz
160
2
22000
20000
4
25000
25000
6
8
180
2
17000
14000
4
25000
25000
6
8
200
2
15000
12000
4
25000
25000
6
8
225
250
280
2
5000
4000
4
14000
12000
6
20000
17000
8
24000
20000
2
4000
4000
4
13000
10000
6
18000
16000
8
20000
20000
Table 5.
Grease amounts and intervals for WEG
W22 TEFC motors – ball bearings
Motor
size
Poles
Lubrication
intervals [hours]
50 Hz
60 Hz
160
2
16000
12000
4
25000
25000
6
8
180
2
11000
8000
4
25000
25000
6
8
200
2
9000
6000
4
25000
21000
6
25000
8
225
250
280
4
11000
9000
6
16000
13000
8
20000
19000
4
9000
7000
6
14000
12000
8
19000
17000
Table 6.
Grease amounts and intervals for WEG
W22 TEFC motors – roller bearings
Avoid exposure of fans
and motor parts to
shocks, as these can
result in imbalance and
deformations. Motor bearings
and fan components are
vulnerable parts.
