Table 9.1 - Resistance Checks - Reliance electric GV3000/SE Installation Manual

Troubleshooting the Drive
Step 4. Check the DC bus potential with a voltmeter as described in section 9.3 to
ensure that the DC bus capacitors are discharged.
Step 5. Disconnect the motor from the drive.
Step 6. Check all AC line and DC bus fuses.
Step 7. If a fuse is open, use a multimeter to check the input diodes and output
IGBTs. See table 9.1.
Note that the drives do not have replaceable transistor modules: the entire
drive must be replaced if a transistor malfunctions.
Step 8. Reconnect the motor to the drive.
Step 9. Reattach the drive's cover.
Step 10. Reapply input power.
Input Meter
Diode Connection
No. (+) (–)
* R/L1
1
* S/L2
2
3 * T/L3
4 R/L1 **
5 S/L2 **
6 T/L3 **
* (+) DC Bus Volts power terminal
** (–) DC Bus Volts power terminal
Meter
Connection
IGBT
No. (+) (–)
1 * W/T3
2 * V/T2
3 * U/T1
4 W/T3 **
V/T2 **
5
6 U/T1 **
* (+) DC Bus Volts power terminal
** (–) DC Bus Volts power terminal

Table 9.1 - Resistance Checks

Component is OK if
resistance (R) is:
50 kW < R < 10 MW
Component is OK if
resistance (R) is:
50 kW < R < 10 MW
Component is defective if:
Continuity (short circuit) or
open when the meter is
connected with reversed
polarity
Component is defective if:
Continuity (short circuit) or
open when the meter is
connected with reversed
polarity
9-3