ADJUSTMENT
AND
INSPECTION
MAGNA 85 – 100 BS
Doc.
Issued 12/2006
Rev. 00
Pag.
6 di 18
4
VACC NOT OK
The chopper card recognizes an anomaly in the mechanical
stroke of the accelerator
Possible causes
-
the operator switched on the machine with the
accelerator pressed down or he pressed down the
accelerator before the selection of forward or backward
traverse
-
-
-
-
-
the seat microswitch does not work
the potentiometer and/or the chopper card has been
changed and the relating values between the two
components are to be re-programmed
a cable between the potentiometer and the chopper card is
interrupted
the potentiometer is faulty
the PROGRAM VACC (see chapter Adjustment and
Inspection) has not been carried out correctly
Actions
- check the correct sequence to get traverse
-
-
check the continuity of connections between the
potentiometer accelerator and chopper card
re-program the chopper card with PROGRAM VACC (see
chapter Adjustment and Inspection)
- check the functionality of the potentiometer (it could be
broken) and replace it if necessary (re-programming then
the chopper card)
5
I HIGH AT STAND
The chopper card tests if on rest the signal of the
current is zero. Otherwise, it blocks the traction
Possible causes
-
-
defective current sensor
fault in the feedback circuits, or in the logic or on the
chopper card
Actions
- replace the chopper card
6
NPOT NOT OK
Test on working condition: the negative point brings is
at a wrong
Possible causes
-
the potentiometer is not well connected to the chopper card
-
potentiometer defected
Actions
-
-
check the good connections potentiometer – chopper card
check the potentiometer efficiency
