The Belt Motor Is Jerking - Technogym Forma Service Maintenance Manual

FORMA: Service & Maintenance manual - rev. 3.0

6.4. THE BELT MOTOR IS JERKING

The probable cause of this error is a disconnected phase on the motor or inverter output.
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 4.4 Ohm.
(2) Operate the machine at 8.3 Km/h and place a tester across its terminals U-V, U-W and V-W.
The measured voltage should be 220 VAC.
THE BELT
MOTOR IS
JERKING
1
Are the belt motor windings
short-circuited or
open-circuited?
NO
2
Does the inverter generate
a balanced voltage on all
phases?
YES
Check and/or replace
cable FR-8
YES
Replace the belt motor
NO
Replace the inverter
Page 6.23