49
MicroController Control System
Testing And Adjusting
C5) The most probably reason is that the failure is
inside the controller, replace it.
E1) If there's the bypass contactor check that it is
not stuck or it is too much slow in opening.
For verifying this possibility, disconnect the
bypass and check if the failure disappears :
if this happens, replace the logic.
PAY ATTENTION : the contactors connected to
the controller must not have arc suppressers on
the contactor coils because these are inside
the controller and then the external ones
modify the contactor opening times.
6) VMN HIGH
Test carried out in standby. if the VMN voltage is
greater than 2/3 VBATT, an alarm is shown.
Possible causes:
a) Contactor stuck(only standard traction).
b) Short circuit b BATT and VMN, please
check if there are any metallic parts causing short
circuit in the contactor board.
c) Logic failure, probably the braking diode are
broken, replace the power.
7) NO FULL COND.
The test is carried out in full conduction. If, in this
condition, the VMN is found to be greater than 1/3
VBATT, the diagnostic circuit is faulty, causing a
safety risk, and thus machine operation is inhibited.
If the defect persists, replace the logic.
8) THERMAL PROTECTION
An indication that the controller temperature has
exceeded 80˚C. The maximum current is gradually
reduced, reaching 0 at a temperature of 85˚C.
a) If the alarms occurs while cold, the most
probably reason is the failure of the thermic
diagnosis circuit on the power or on the logic
board, replace on of the two parts or replace the
complete controller.
b) If the alarm often occurs after short time the
machine is working, probably it is due to
inadequate heat sink, check the fixing nuts
tightening and the correct installation.
9) BATTERY LOW
The battery charge is low.
The alarm is signalled only if the “battery check”
option has been selected from the serial console
(default). When this alarm occurs, the maximum
current is reduced to 50%.
10) INCORRECT START
An incorrect starting sequence.
The machine only starts if sequence is followed :
key-handle(or seat)-running.
Possible causes :
a) Running microswitch or handle microswitch
stuck.
b) Error in sequence made by the operator, pedal
pressed at the key on.
c) Incorrect wiring if there is not any defect
externally is necessary to replace the logic.
11) FORW - BACK
The test is carried out continuously. An alarm is
signalled when two requests for running are made
simultaneously. Possible causes:
a) Defective wiring.
b) Running microswitch stuck.
c) Incorrect manoeuvre.
d) If there is not external defects, replace the logic.
12) VACC NOT OK
The test is made in standby.
The alarm indicates that the accelerator voltage is
greater than 1V with respect to the minimum
value stored. Possible causes:
a) A potentiometer wire is interrupted or the
potentiometer negative has not been connected
to the PIN DC-2 of the logic board, In this case
it is generated an alarm because the logic don't
find the load to pin DC-2.
b) The potentiometer is not correctly calibrated.
c) The potentiometer is defective(interrupted).
13) I HIGH AT STAND
Test carried out in standby. Checks that the
current is nil.
If this is not verified, an alarm is signalled.
This alarms inhibits machine operation.
Possible cause:
a) Current sensor broken and logic failure.
First replace the logic, and if the defect persists,
replace the power unit.
14) I=0 EVER
Test carried out in running.
Checks that the current during running is greater
than a minimum value. If not, an alarm is signalled
and the machine is shut down. Possible causes:
a) The current sensor is faulty. Replace the power
unit.
b) Wrong connections of the motor cables to the
power bars SH- and SH+.
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