Rockwell powerflex 700h, Service Manual

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1-18 Troubleshooting and Error Codes
Blown Input Fuse
If the drive causes the AC input line fuse to open, complete the following
tests to verify that the power structure is functioning properly before
replacing the AC input line fuse and reapplying power to the drive.
No HIM Display
If the HIM does not display, complete the following procedure to verify that
power is available.
Diagnostic Procedure Corrective Action
1. Disconnect the motor leads. Continue with step 2.
2. Complete the “Conducting Forward and
Reverse Biased Diode Tests for Major Power
Components” on
page 2-3 for the Rectifier
module.
If the test is not completed successfully, replace
the Rectifying module.
Continue with step 3.
3. Complete the “Conducting Forward and
Reverse Biased Diode Tests for Major Power
Components” on
page 2-3 for the Output Power
modules.
If the test is not completed successfully, replace
the Output Power modules.
Continue with step 4.
4. Examine the DC bus capacitors. If there is evidence of charring and damaged
reliefs, replace the DC bus capacitors.
Otherwise, continue with step 5.
5. Check the motor windings and motor cables
with a high resistance DVM (megger).
Repair or replace the motor as needed.
Otherwise, continue with step 6.
6. Disconnect and check the AC choke with a high
resistance DVM (megger).
•
Verify that the line to line is open
•
Verify that the line to ground is open
•
Verify that the input to output is low
resistance, but not shorted
Repair or replace the AC choke as needed.
Continue with step 7.
7. Reconnect the AC choke and motor leads.
Diagnostic Procedure Corrective Action
1. Measure the DC bus voltage. If the DC bus is not within specification, repair or
replace the Rectifying module as needed.
Otherwise, continue with step 2.
2. Measure the DC voltage supply at connector
X4 on the DPI circuit board on the back of the
HIM cradle. The voltage should be
approximately 12V DC.
If the DC voltage is incorrect:
•
PowerFlex 700S drives - Replace the High
Power Fiber Optic Interface circuit board
•
PowerFlex 700H drives - Replace the output
power modules
Otherwise, continue with step 3.
3. Check for loose or missing connections
between the DPI circuit board and the High
Power Fiber Optic Interface circuit board.
If there are loose or missing connections, or a
board has been damaged, replace the loose or
missing connections, or repair or replace any of
the boards as needed.
Otherwise, Replace the HIM.