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5.4 Warning and alarm codes
Warning
The CU 321 will continue to operate for some time
depending on the alarm. The yellow warning indica-
tor light on the CU 321 flashes, and the specific code
appears in the display. See the specific codes about
the performance during warning.
Alarm with reset
The CU 321 will stop operating. The red indicator
light on the CU 321 lights up and the CU 321 will not
start until it is reset. The CU 321 will try to start if
automatic reset has been selected. Otherwise, press
to reset the alarm. The specific code will appear
in the display.
Alarm locked
The CU 321 will stop running and the AC power must
be cycled to reset the alarm. Alarm locked is the
most severe type of alarm indicating that there is
something wrong in the installation.
The yellow and red indicator lights on the CU 321 will
light up during an alarm-locked situation. The spe-
cific code will appear in the display.
Indicator lights on display
Code Description
Status of the alarm
Warning
Alarm with
reset
Alarm
locked
2 Sensor fault (sensor input below 4 mA) x
4 AC line phase fault (only on 5 hp drive!) x x x
5 Voltage warning high x
6 Voltage warning low x
7Overvoltage x
8 Undervoltage x
9 Overload x
12 Current limit x
13 Overcurrent x
14 Ground fault x
15 Internal fault x
16 Short-circuit x
35 Inrush fault x
36 Overtemperature x x
37-45 Internal fault x x
79 Dry run x
Warning/alarm LED indications
Warning Yellow
Alarm with reset Red
Alarm locked Yellow and red
Off/
Reset
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