Checking Out The Drive With Input Power Off - Reliance electric GV3000 Instructions Manual

9.4 Checking Out the Drive with Input Power Off

9-8
Use the following procedure to check the drive circuitry with power off:
ATTENTION: DC bus capacitors retain hazardous voltages after input
power has been disconnected. After disconnecting input power, wait five
!
(5) minutes for the DC bus capacitors to discharge and then check the
voltage with a 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.
Step 1. Turn off and lock out input power. Wait five minutes.
Step 2. Remove the drive's cover. On 200-400 HP drives, open the outer cabinet
door.
ATTENTION: Do not operate 200-400 HP drives with the outer and inner
cabinet doors open due to possible exposure to high voltage. Close the
!
outer and inner cabinet doors before putting the drive into run. Failure to
observe this precaution could result in severe bodily injury or loss of life.
Step 3. Verify that there is no voltage at the drive's input power terminals.
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 1–10 HP drives do not have replaceable transistor modules: the
entire drive must be replaced if a transistor malfunctions. Intelligent Power
Modules (IPM) may be replaced in 60–150 HP drives.
Step 8. Reconnect the motor to the drive.
Step 9. Reattach the drive's cover. On 200–400 HP drives, close the inner and outer
cabinet doors.
Step 10. Reapply input power.
GV3000/SE AC Drive Hardware Reference, Version 6.06