Checking Out The Power Modules With Input Power Off; Table 9.1 Resistance Checks - Reliance electric GV3000 Instruction Manual

9.4

Checking Out the Power Modules with Input Power Off

Use the following procedure to check the drive's Power Module circuitry with power off:
D C BUS CAPACITORS RETAIN HAZARDOUS VOLTAGES AFTER INPUT POWER HAS BEEN
DISCONNECTED. AFTER DISCONNECTING INPUT POWER, WAIT FIVE (5) MINUTES FOR THE D C
BUS CAPACITORS TO DISCHARGE AND THEN CHECK THE VOLTAGE WITH A VOLTMETER TO
ENSURE THE D C BUS CAPACITORS ARE DISCHARGED BEFORE TOUCHING ANY INTERNAL
COMPONENTS. FAILURE TO OBSERVE THIS PRECAUTION COULD RESULT IN SEVERE BODILY
INJURY OR LOSS OF LIFE.
Step 1. Turn off and lock out input power. Wait five minutes.
Step 2. Remove the drive's cover.
Step 3. Verify that there is no voltage at the drive's input power terminals.
Step 4. Check the D C bus potential with a voltmeter as described in section 9.3 to ensure that the
D C bus capacitors are discharged.
Step 5. Disconnect the motor from the drive.
Step 6. Check all A C line and D C bus fuses.
Step 7. If a fuse is blown, use a multimeter to check the input diodes and output IGBTs. See table
9.1.
Note that 1 10HP drives do not have replaceable transistor modules: the entire drive must
be replaced if a transistor malfunctions. Intelligent Power Modules (IPM) may be replaced if
they fail in a 60 150HP drive.
Step 8. Re connect the motor to the drive.
Step 9. Re attach the drive's cover.
Step 10. Re apply input power.
Input Meter
Diode Connection
No.
(+) (-)
1 * R/L1
2 * S/L2
3 * T/L3
4 R/L1 **
5 S/L2 **
6 T/L3 **
* (+) D C Bus Volts power terminal
** (-) D C Bus Volts power terminal
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DANGER

Table 9.1 Resistance Checks

1 60HP Drives
Component is OK if
resistance (R) is:
50 < R < 10 Megohm
Component is defective if:
Continuity (short circuit) or open when the meter is
connected with reversed polarity connected with reversed polarity