RUN XT: Service & Maintenance Manual - rev. 2.0
Page 6.9
6.3.1. THE INVERTER DISPLAY SHOWS E1, E2, E3, E4 OR E5
These inverter error messages are related to output short-circuit problems.
1
NO
Replace the inverter: see
paragraph 7.13.
YES
Is the inverter output
short-circuited?
Is there a short-circuit on the
motor cable terminals?
Is the belt motor
short-circuited?
Replace the belt motor:
see paragraph 7.11.
Replace the belt motor
cable
2 3
YES
YES
NO
Does the machine resume
correct operation after being
turned off for 1 minute?
YES
Probable interference. The
machine is OK
Replace the inverter: see
paragraph 7.13.
NO
NO
E2 E3 E4 E5E1
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) Disconnect the motor cable from the inverter and place the tester probes between its terminals
U-V, U-W and V-W. The measured resistance should be very high, in the order of MOhms. It
is difficult to obtain a stable resistance measurement, however, a phase can be considered
short-circuited or defective when the measured resistance is in the order of a few tens of
Ohms.
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