Publication 2364F-5.05 - March 1999
Troubleshooting The RGU
2-5
Damaged Components
Damaged components may be suspected if a loud discharge or melting
smell has come from the RGU. Check the following items to find damaged
components.
Are the AC line fuses in good condition?
Replace
all
the AC line fuses.
Test the IGBTs (as instructed in Chapter 4).
Are any IGBTs damaged?
Replace the damaged IGBTs. Test and
replace the gate driver board and snubber
boards as necessary.
Are the DC bus fuse(s) in good condition?
Replace the damaged fuses.
No
Yes
Yes
No
No
Yes
Check the RGU for melted wiring. Test the
isolation board and gate driver board (as
instructed in Chapter 4). Replace as necessary.
Push the disconnect lever to off and verify zero volts
across the DC bus before testing the following items.
Is there any visible damage to the MOVs?
Replace the MOVs.
Yes
No
!
ATTENTION: