User Manual

Troubleshooting the Drive
9-11
Table 9.1 - Resistance Checks (Continued)
200–400 HP Drives (with the motor connected)
IGBT
No.
Meter
Connection
(+) (-)
Component is OK if
resistance (R) is: Component is defective if:
All
IGBTs
tested in
parallel
U/T3 * 10 < R < 1 Megohm Continuity (short circuit) or
open when the meter is
connected with reversed
polarity
* U/T3
U/T3 **
* U/T3
* (+) DC Bus power terminal
** (-) DC Bus power terminal
200–400 HP Drives (with the motor disconnected)
IGBT
No.
Meter
Connection
(+) (-)
Component is OK if
resistance (R) is: Component is defective if:
1 * W/T1 10 < R < 1 Megohm Continuity (short circuit) or
open when the meter is
connected with reversed
polarity
2 * V/T2
3 * U/T3
4 W/T1 **
5 V/T2 **
6 U/T3 **
* (+) DC Bus power terminal
** (-) DC Bus power terminal