CHAPTER 10 – PREVENTIVE AND CORRECTIVE MAINTENANCE 174
11. When all cables have been reconnected, check
that the drive control system and the phase
module communicate with each other. Switch
on the auxiliary power supply.
Check that the LEDs on the Phase-INT circuit
board of the phase module are on (box).
12. Push the phase module back into the rack as far
as it goes and tighten the fastening bolt on
each side.
13. Remove the rails and reinstall the acrylic panel.
14. Switch on all miniature circuit breakers in the
control compartment.
The work is now completed, and the drive can be
started again.
For further information, see 8.6 Starting the drive.
10.6.13 Replacing a fan
The fan housing can stay on the roof when only the
impeller is replaced.
1. Disconnect all power supplies to the drive and
ground the drive.
For further information, see 10.6.3 De-energiz-
ing the drive locally.
To isolate the fan unit from the auxiliary power
supply, switch off the motor starter of the fan
unit.
2. Continue with Standard fan units or DTL fan
units as applicable.
Standard fan units
3. Remove the cover from the fan housing.
4. Disconnect the control and power supply cables
of the fan.
5. Remove the fastening screws from the support
plate and the duct ring.
6. Using the lifting eyes in the fan housing cover
and a lifting gear, lift off the support plate with
the fan attached to it.
7. Unscrew the support plate from the fan
8. Replace the fan and re-assemble in reverse
order of removal.
DTL fan units
9. Disconnect the power supply cable at the entry
of the terminal box.
10. Unscrew the cover from the fan housing.
To identify the motor starter, see Appen-
dix D – Wiring diagrams.
Terminal box
Disconnect here
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