Rockwell Automation SA3000 High Power Modules - Manual (Page 47)

Diagnostics and Troubleshooting 4-15
4.4.2 Replacing an IGBT Phase Module Assembly
Important: When replacing an IGBT phase module assembly be sure to re-install,
position, and tighten the hardware in the proper sequence. The IGBT
phase module must be aligned correctly to prevent damage to the
components.
If all three IGBT phase modules are to be replaced, it will be easier to remove them by
starting at the top and working down, i.e., begin by removing module U, continue with
module V, and then finish by removing module W. Be sure to re-install the IGBT phase
modules in reverse order, beginning by installing module W, continuing with module V,
and finishing by installing module U.
Use the following procedure to replace an IGBT phase module assembly (U, V, or W):
Step 1. Turn off and lock out AC input power.
Step 2. Wait ten minutes to allow the DC bus voltage to dissipate.
Step 3. Open the cabinet doors and check the voltage across the DC bus bars, 347
A,B,C (+ bus) and 345 A,B,C (- bus), with an external voltmeter to ensure the
DC bus capacitors are discharged before touching any internal components.
See figure 4.1.
Step 4. Remove all wires, connectors, and harnesses from the IGBT Phase module
assembly to be replaced. Label all of the wires to aid in re-installation. Refer
to the wiring diagrams supplied with your system.
Step 5. Remove the right M8 bolt from the fuse. See figure 4.7, callout 2. Note that if
you are only replacing the fuse, remove both M8 bolts as shown in figure 4.7,
callouts 1 and 2. Remove the fuse without disturbing the alignment of the
IGBT Phase module.
Step 6. Remove the two M8 bolts from the AC LEM bus bar. The bolts are located
above the fuse and under the LEM device. See figure 4.7, callout 3.
Step 7. Remove the two M6 hex nuts from the negative bus bar. See figure 4.7,
callout 4.
Step 8. Remove the two 5/16” x 1” cap screws, flat washers, and lock washers from
the heatsink. One cap screw is located on each side of the heatsink. See
figure 4.7, callout 5.
Step 9. Remove the IGBT Phase module assembly from the Power Module.
Step 10. Install the new IGBT Phase module assembly by aligning the module's
mounting holes with the studs. Push the module into place and hold it in
position.
!
ATTENTION: DC bus capacitors retain hazardous voltages after input
power has been disconnected. After disconnecting input power, wait ten
(10) minutes for the DC bus capacitors to discharge. Open the cabinet
doors and check the voltage across the DC bus bars, 347 A,B,C (+ bus)
and 345 A,B,C (- bus), with an external 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.