7200 TROUBLESHOOTING
E - 2
1.0 Drive Cabinet Unresponsive/Inverter Display Blank
NOTE: This error can occur even if the ACU has not been
installed.
If the drive cabinet does not respond to drive commands from local controls and
the inverter display is blank (the inverters are not energized), follow these steps.
On the drive cabinet swing-out panel, check to see if the CONTROL POWER rocker
switch (breaker) is in the ON position and verify that the green LED on the switch
is illuminated. Also verify that the CONTROL switch is in the LOCAL position.
1. If the LED is not illuminated, check the following:
a Verify power to the main power feeder and breaker.
b. Verify that all emergency stop pushbuttons and interlocks are not
activated.
c. Check the input wiring to the 24 VDC power supply to verify that AC
voltage is applied.
d. If the conditions listed in steps a through c exist, measure the power
supply output pins to verify that 24 VDC is available. If DC voltage is not
available, disconnect the limit switch wiring from the drive cabinet to be
sure that the +24 VDC lines from the cabinet are not shorted to ground.
Recheck the power supply and if DC voltage is still not available, replace
the power supply.
2. If the LED is illuminated and the main contactor is not energized, check the
following:
a. Shorted diode (02) across pins 7 and 8 of relay KC1 on the relay PCB.
b. Tripped inverter circuit breaker.
c. Loose wiring on any terminal on the relay PCB.
d. Relay K7 (and diode D19 across pins 13 and 14) on the relay PCB.
2.0 Drive Cabinet Inverter Faults
NOTE: The fault codes in brackets are indicated on the inverter
displays.
These faults are indicated by a display of AZ|EL FLT on the ACU. Refer to Section
4 for proper inverter parameter setup. For more comprehensive inverter fault
information, see the inverter O&M manual provided on the product CD.
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