Big Joe J1-192 Maintenance Repair Parts Manual page 24

Table 3-3 Troubleshooting Chart (Traction/Lift Controller) - Continued
ERROR ERROR TEXT
49 I=0 EVER
55 PROGRAM LIFT
LEVER
53 STBY I HIGH
3-8
POSSIBLE CAUSE
This test is carried out when the motor is
running, and it verifies that the current
feedback sensor is not constantly
stuck at 0.
The SW continuously matches the
potentiometer connected to CNA#18
with the Main Lifting/Lowering pair
request (CNB# and CNB#8). When the
vehicle TYPE is set 2, the alarm occur
in the following conditions:
1. If both the Main Lifting and Main
Lowering request are disactive and
the potentiometer voltage is higher
than 60 mV over either the MIN
LIFT or the MIN LOWER setting.
2. If the Main Lifting request is active
and the potentiometer voltage is
higher than 200 mV over the MAX
LIFT setting.
3. If the Main Lowering request is
active and the potentiometer volt-
age is higher than 200 mV over the
MAX LOWER setting.
4. If the MIN LIFT setting is higher
than the MAX LIFT setting.
When the vehicle TYPE is set at 3, the
alarm occurs in the following condi-
tions:
1. If the Main Lowering request is
higher that the MIN LOWER.
2. If the MIN LOWER setting is higher
that the MAX LOWER
This diagnosis is executed only when
the main contactor is opened and
asked to be closed (e.g. at key on or
when the main contactor is opened
and a new motion request turn active).
Then the outputs of the Current amplifi-
ers must be in a narrow window close
to 2.5 Vdc (from 2.26 V to 2.74 V).
Otherwise this STBY I HIGH alarm
occurs.
FAULT CLEARANCE
If everything is OK for the motor, the
problem could be in the related circuit.
Check the Main Lifting/Lowering pair
(CNB#8 and CNB#9) and the voltage
on the potentiometer connected to
CNA#18. (Use the readings LIFTING
SWITCH, DESCENT SWITCH and
LIFTING CONTROL in the TESTER to
facilitate the troubleshooting).
If the alarm occurs permanently, replace
the controller.
BL-J1-192-0315 - 11-19-2019