RUNRACE : Service & Maintenance Manual - rev. 2.0
Page 6.25
6.5. THE BELT MOTOR IS JERKING
The probable cause of this error is a disconnected phase on the motor or inverter output.
THE BELT MOTOR
IS JERKING
Are the belt motor windings short-
circuited or open-circuited?
Does the inv erter generate a
balanced v oltage on all phases?
YES
NO
YES
Replace the inv erter
1
2
NO
Check and/or replace
cable RN-17Q connecting
the inv erter to the belt
motor
Replace the belt motor
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 motor and place a tester across its terminals U-V, U-W
and V-W. The measured resistance should be approximately 1.7 Ohm.
(2) Run the machine at 12.6 Km/h and place a tester across its terminals U-V, U-W and V-W.
The measured voltage should be 220 VAC.
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