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72 Fault tracing
Fault indication/Fault
Chopper starts to function at
too low a DC voltage.
Inverter trips on fault 3210 DC
link overvoltage.
Brake resistor or chopper
overheats.
LEDs
￭
Control panel and panel platform/holder LEDs
The ACX-AP-x control panel has a status LED. The control panel mounting platform or
holder has two status LEDs. For their indications, see the following table.
Location
LED
Control panel
Continuous green
Flickering green
Blinking green
Continuous red
Blinking red
Blinking blue (ACS-
AP-W only)
Flickering blue
(ACS-AP-W only)
Control panel
Red
mounting platform or
Green
holder (with the con-
trol panel removed)
￭
Control unit LEDs
This table shows the LEDs visible on the BCU control unit.
LED
Color
BATT OK
Green
PWR OK
Green
FAULT
Red
WRITE
Yellow
Cause
Chopper voltage setting too low.
Chopper voltage setting too high.
The maximum brake cycle exceeded
or resistor cooling insufficient.
Indication
The unit is functioning normally.
Data is transferred between the PC and the unit through the USB
connection of the control panel.
There is an active warning in the unit.
There is an active fault in the unit.
There is a fault that requires the stopping and restarting of the
drive/converter/inverter.
The Bluetooth interface is enabled, in discoverable mode, and
ready for pairing.
Data is being transferred through the Bluetooth interface of the
control panel.
There is an active fault in the unit.
Power supply for the control unit is OK.
Indication
Battery voltage of the real-time clock is OK (higher than 2.8 V).
When the LED is not lit,
• battery voltage is below 2.8 V,
• the battery is missing, or
• the control unit is not powered.
Internal voltage OK
The control program indicates that the equipment is faulty. See
the appropriate firmware manual.
Writing to SD card in progress.
What to do
Check voltage setting.
Check voltage setting.
Check parameters of all inverters.
Check duty cycle and resistor cooling.
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