RUN XT: Service & Maintenance Manual - rev. 2.0
Page 6.19
Follow the procedure step by step to correctly diagnose the problem. Take particular care with the
checks highlighted by circled numbers, which are described in detail below:
(1) The SW version must be higher than EUR 2.4, USA 2.3, TGS EUR 2.2 or TGS USA 2.3.
(2) Place the tester probes between terminals AL0 and AL1 of the inverter. Under an alarm
condition the measured voltage should be 0 Vdc, under normal conditions it should be +10
Vdc.
(3) As for point (2) but between pins 3 (signal) and 4 (ground) of connector CN1 on the inverter
interface board.
(4) Place the tester probes between pins 3 (ground) and 9 (signal) of connector CN2 on the
inverter interface board. Under an alarm condition the measured voltage should be 0 Vdc,
under normal conditions it should be +5 Vdc.
(5) As for point (4) but between pins 3 (ground) and 8 (signal) of connector CN1 on the CPU
board.
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