Unique Broadband Systems Ltd. DRU1KW User Manual
Chapter
6
Maintenance
6.5.11 Fan Box Replacement
Always ensure that the HB or LB sub-system has been placed in standby
mode and DC power to the corresponding HPAs has been disabled. This
mode and DC power to the corresponding HPAs has been disabled. This
will prevent damage to the HPAs due to overheating.
Always ensure that the AC power to the fan box has been switched OFF
prior to removing the fan box. This will prevent injury caused by electric
prior to removing the fan box. This will prevent injury caused by electric
shock and prevent damage to equipment.
Always remove/install the fan box with the aid of a second handler. The
fan box weighs approximately 38 lbs.
6.5.11.1 Fan Box Removal
The fan box should be removed in the following sequence:
1. Open the electronics compartment front door for the corresponding sub-system.
2. Open the HPA compartment rear door for the corresponding sub-system.
3. Using the HBE GUI or LBE GUI, place the corresponding sub-system in standby mode.
4. Using the LBE GUI, place the LB sub-system in standby mode.
5. Switch OFF the HPA PSU circuit breakers, located on the HB cabinet PDU or LB cabinet
2. Open the HPA compartment rear door for the corresponding sub-system.
3. Using the HBE GUI or LBE GUI, place the corresponding sub-system in standby mode.
4. Using the LBE GUI, place the LB sub-system in standby mode.
5. Switch OFF the HPA PSU circuit breakers, located on the HB cabinet PDU or LB cabinet
PDU – please refer to section 2.3.4 or 2.3.5 for breaker designations.
6. Remove the four (4) lifting eyes from the cabinet hood – see Figure 6-22.
7. Carefully lift the cabinet hood from the top of the cabinet and place it aside.
8. Disconnect the fan box AC power cables from the FAN 1 / FAN 2 or FAN 3 / FAN 4
7. Carefully lift the cabinet hood from the top of the cabinet and place it aside.
8. Disconnect the fan box AC power cables from the FAN 1 / FAN 2 or FAN 3 / FAN 4
panel mount connectors located on the HPA compartment frame backplane – see
9. Cut the cable ties which secure the fan box AC power cables to the top of the HPA
compartment – see Figure 6-24.
10. Remove the eight (8) 1/4-20 socket head cap screws (with 1/4” lock washers and flat
washers) which secure the fan box to the cabinet – see Figure 6-25.
11. Using two handlers, one located on each side of the cabinet, carefully lift the fan box
from the top of the cabinet and set it aside. Ensure that the weatherproof gasket is
not stuck to the bottom of the fan box.
not stuck to the bottom of the fan box.
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