2-18
CHECK TRACTION MOTOR PHASES BALANCING
When traveling or material handling operation seems abnormal, it is possible to accurately judge
if the controller is functioning correctly or not by measuring the motor phase balancing.
Measuring method Procedure using a clamp amperometer
(1)Remove the rear plastic
(2)Jack up the front wheels
(3)Connect a clamp amperometer
(4)Operate the lifting lever
(5)Check the value of the current of each phase
(6)If the value of one phase is higher or lower respect the others it means that the system is not
balanced and the motor is jerking. In this situation the logic unit must be replace
Measuring method, procedure using a multimeter
(1)Remove the rear plastic
(2)Jack up the front wheels
(3)Set the multemeter in Volt AC
(4)Connect the negative of the multemeter on the battery negative
(5)Connect the positive on one of the phase of the logic unit
(6)Check the value of the voltage of each phase
(7)If the value of one phase is higher or lower respect the others it means that the system is not
balanced and the motor is jerking. In this situation the logic unit must be replace
In order to compare the value of the phases it is necessary to use the same tool and not different
type of multimeters or clamp ammeters for each phases. This because the tool have different
tolerance respect each others.
Measuring method, procedure using
a multimeter
Measuring method Procedure using
a clamp amperometer
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