Rockwell Automation Liqui-Flo Trane Addendum - Manual (Page 31)

Cabinet Servicing 5-1
C
HAPTER
5
Cabinet Servicing
This chapter describes how to remove the Liqui-Flo drive from the cabinet and
provides a list of replacement parts.
5.1 Removing the Liqui-Flo Drive from the Cabinet
Follow the procedure in section 5.1.1 if you are removing a Liqui-Flo drive from a
6-pulse rectifier cabinet. Follow the procedure in section 5.1.2 if you are removing a
Liqui-Flo drive from a 12-pulse rectifier cabinet.
5.1.1 Removing the Drive from a 6-Pulse Rectifier Cabinet
Use the following procedure to remove a Liqui-Flo drive from a 6-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.
b. Connect one end of a drain hose to the accumulator on the closed loop
coolant system. Connect the other end of the hose to a drain.
c. Connect a shop air line to the closed loop coolant system at the quick
disconnect fitting. Pressurize the line to 60-90 psi for 1 to 2 minutes to
flush all of the coolant out of the drive.
d. Remove the basket from the Y-strainer and check for any contaminants.
e. From inside the cabinet, disconnect the coolant lines from the panel using
a 1-1/16” wrench on the swivel nut connected to the bulkhead fitting. A
crow’s-foot wrench is recommended. Verify that no residual coolant
remains in the drive.
!
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.