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Motor & Resolver Circuitry
Electrical
Troubleshooting Guide
IRB6400 M94A
Rectifier (Cont)
If the rectifier is functioning correctly a green LED will
turn ON at the front of the rectifier. (This LED will only
light when the motors are turned ON.) If there is a fault
on the rectifier, such as low incoming voltage, low
output voltage, or rectifier over temperature, a red LED
will turn ON at the front of the board, and an error will be
generated on the Teach Pendant. Then the drive system
will shut down. To reset the red LED, either power the
cabinet OFF and then ON again, or use the INIT button
on the computer back plane.
Trouble shooting of the rectifier consists of monitoring
the LEDs on the front of the board. Also by checking the
incoming voltage and then the output of the rectifier.
Checking the output voltage can be difficult, but is
possible by checking it on the rectifier board across the
capacitors.
A bad rectifier can damage drive boards in some cases.
Use caution if swapping rectifier boards to find out if a
board is functioning properly because other components
can cause a rectifier to go bad.
Replacement of a rectifier board requires no special
setups or adjustments.
Fig. 9-1 ............
Fig. 9-2 ............
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