Tweco Troubleshooting Power Supply - Manual (Page 14)

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2-2 Input voltage out of range.
The Power supply contains circuits that monitor the AC input voltage. This
works as wrong voltage detection i.e. if unit is configured for 208-230 and 460V
is applied. If there is more than one inverter and one is configured wrong or the
harness connecting to CN1 (230V) or CN2 (460V) on the voltage selection PCB
in not connected it will signal wrong voltage, voltage out of range.
2-2 code will be set if input voltage goes outside the range 141-258 for 208-230
units; 304-533 for 400V and 460V units; 380-665 for 600V units. These ranges
are for wrong voltage detection. It does not mean the unit should be operated
anywhere within the range. For example, do not attempt to operate a unit
configured for 208-230 on 150 VAC.
Causes for 2-2 code:
• CN1 or CN2 connector on one or more inverter voltage select PCBs not
plugged in.
• Power supply inverter(s) configured for incorrect voltage.
• Input voltage is outside the range, too low or too high, or momentarily
goes outside the range. Poor power quality with drop outs or surges can
set 2-2 code. Because they are transient in nature are difficult to detect
w/o a power line monitor.
• At arc transfer as current ramps up Input voltage droops due to not
enough capacity or wires too small.
• Defective power supply PCB (PCB1, PCB4, PCB5) or CCM.
Symptoms when voltage is actually out of range:
If Start signal is not on:
• Code 2-2 blinks, input contactor MC1 (also MC3, MC4 in 2 or 3 inverter
units) and inverter fans shut off (after slight delay) when outside the range.
Coolant pump and fan(s) continues to operate unless voltage is so low it
cannot.
• If voltage returns to within the range input contactor(s) and inverter fans come
on and 2-2 code is automatically cleared.
If Start signal is on:
• Code 2-2 blinks, input contactor(s) and inverter fans shut off (after slight
delay) when outside the range. Coolant pump and fan(s) continues to operate
unless voltage is so low it cannot.
• If voltage recovers but Start remains on, input contactor(s) and inverter fans
come back on but 2-2 code continues to blink. Remove Start and 2-2 code
continues to blink. Reapply Start clears the code and unit operates normally.