Rockwell Automation Liqui-Flo Trane Addendum - Manual (Page 33)

Cabinet Servicing 5-3
Step 16. Using the hoist, lift the drive slightly to take the load off of the cabinet’s panel
studs. Pull the drive off of the studs and up through the wire entry and access
panels until it is clear of the cabinet enclosure. Note that drive’s center of
gravity is forward of the hoist, which will result in the top of the drive tilting
forward during removal.
Step 17. Move the drive to a horizontal pallet for servicing or shipment. The eyebolts
and the chain between them do not need to be removed.
Step 18. Reinstall the drive by following steps 17 to 1 in reverse order.
a. During reinstallation, tighten the hardware to the torque values (+ 10%)
shown in table 5.1
b. Visually inspect the insulation of the wiring and buswork to ensure that it
was not damaged.
c. Refill the drive with coolant.
Step 19. Test the drive for proper operation by following the start-up procedures in
instruction manual D2-3410.
5.1.2 Removing the Drive from a 12-Pulse Rectifier Cabinet
Use the following procedure to remove a Liqui-Flo drive from a 12-pulse rectifier
cabinet:
Step 1. Turn off and lock out AC input power to the cabinet.
Step 2. Place the circuit breaker in the Off position. Wait five minutes.
Step 3. Verify that there is no voltage at the drive’s input power terminals.
Step 4. Check the DC bus potential with a voltmeter to ensure that the DC bus
capacitors are discharged.
Step 5. Drain the drive’s coolant and disconnect the coolant lines.
a. Use a ball valve at the inlet connection to drain the coolant while running
the pump for 1 to 2 minutes.
Table 5.1 – Hardware Tightening Torques
Hardware
Maximum Recommended
Tightening Torque
1/4” - 20 UNC Screws 75 in-lb
1/2” - 13 UNC- 2B Nut 45 ft-lb
3/8” - 16 UNC - 2B Nut 19 ft-lb
I/O Terminal Block Screws 4.5 in-lb
!
ATTENTION: DC bus capacitors retain hazardous voltages after input
power has been disconnected. After disconnecting input power, wait five
(5) minutes for the DC bus capacitors to discharge and then check the
voltage with a voltmeter to ensure the DC bus capacitors are discharged
before touching any internal components. Failure to observe this
precaution could result in severe bodily injury or loss of life.