Zapi SEM1 User Manual page 26

6. FORW + BACK
The test is carried out continouosly. An alarm is signalled when a double running
request is made simultaneously. Possible causes:
a. defective wiring;
b. running microswitch failure;
c. incorrect operation;
d. if the defect persists, replace the logic.
7. CAPACITOR CHARGE
The test is carried out during initial diagnosis. The alarm is signalled if the capacitor
charge is slower than 2 sec. A possible cause is a failure in the power unit.
8. DRIVER SHORTED, COIL SHORTED
This alarm is signalled if there is a failure of the main contactor. Possible causes:
a. the contactor coil is shorted;
b. the main contactor driver is broken;
c. failure on the logic.
9. I HIGH AT STAND
Test carried out in standby. Check if the current is 0. If not verified, an alarm is
signalled which inhibits machine operations. Possible causes:
a. current sensor failure;
b. logic failure: first replace the logic; if the defects persists, replace the power unit.
10. I = 0 EVER
Test carried out during travel. It checks if the current is greater than a minimum
value. If not, an alarm is signalled and the machine operation is inhibited. Possible
cause: the current sensor has failed. Replace the power unit.
11. VMN NOT OK
The test is carried out in standby and until the 70% of the PWM is reached. If the
VMN voltage is lower than 1/3 battery voltage an alarm is signalled. Possible
causes:
a. Problems with the motor power circuit;
b. check if there is a dispersion of the motor towards ground (motor frame fault);
c. chopper failure, replace it.
12.HIGH TEMPERATURE
Chopper temperature is greater than 75°C. The maximum current is reduced pro-
portionally to the temperature increase. The chopper stops at 85°C.
If the alarm is signalled when the chopper is cold:
a. check the wiring of the thermal sensor;
b. thermal sensor failure;
c. logic board failure.
13. BATTERY LOW
The battery is discharged. This alarm is present only if the "battery check" option
has been selected.
Page 26
SEM1