Open Circuit Field Wiring; Stalled Pump Motor Or Power Wiring Error; Open Circuit Pump Motor Wiring; Traction T High - Check Power Circuits - JLG 1930ES Service Maintenance Manual

SECTION 6 - DIAGNOSTIC TROUBLE CODES
7-7 Electric Motor
DTC FAULT MESSAGE
775 OPEN CIRCUIT FIELD WIR-
ING
776 STALLED PUMP MOTOR OR
POWER WIRING ERROR
777 OPEN CIRCUIT PUMP
MOTOR WIRING
778 TRACTION T HIGH - CHECK
POWER CIRCUITS
779 TRACTION T LOW - CHECK
POWER CIRCUITS
7710 PUMP P HIGH - CHECK
POWER CIRCUITS
7711 PUMP P LOW - CHECK
POWER CIRCUITS
7741 ARMATURE BRAKING CUR-
RENT TOO HIGH
6-16
DESCRIPTION
Drive, Steer, and Lift Prevented
Drive, Steer, and Lift Prevented
Drive, Steer, and Lift Prevented
Drive, Steer, and Lift Prevented
Drive, Steer, and Lift Prevented
Drive, Steer, and Lift Prevented
Drive, Steer, and Lift Prevented
Drive, Steer, and Lift Prevented
– JLG Lift –
CHECK
• The System Module applied field current, but could regulate the
desired current. The situation is caused by improper field wiring
or a damaged motor.
• ZAPI - HEALTH (Status LED) - ON
• The System Module measured improper pump current feedback
(>4.5V or <0.5V) for 240mS. This is caused by a stalled pump
motor, a power wiring issue, or a System Module malfunction.
• ZAPI - HEALTH (Status LED) - ON
• The System Module measured pump current less than 8A while
the motor voltage was greater than 7V for 1200mS. This indi-
cates there is an open-circuit between the System Module's –P
terminal and the pump motor.
• ZAPI - HEALTH (Status LED) - ON
• While driving, the voltage measured at the System Module's T
terminal did not agree with the predicted value for at least 300mS.
This issue may be caused by a power wiring error or an internal
fault.
• ZAPI - HEALTH (Status LED) - ON
• While driving, the voltage measured at the System Module's T
terminal did not agree with the predicted value for at least
1000mS. This issue may be caused by an opencircuit of the
armature wiring (+B and –T terminals) or an internal fault.
• VMN does not increase more than 1.3V
• VMN is less than 20% Battery Voltage
• Battery Voltage . VMN is greater than 4V
• ZAPI - HEALTH (Status LED) - ON
• While steering or lifting up, the voltage measured at the System
Module's P terminal did not agree with the predicted value for at
least 240mS. This issue may be caused by a power wiring error
or an internal fault.
• Pump Feedback . Predicted >7V
• ZAPI - HEALTH (Status LED) - ON
• While steering or lifting up, the voltage measured at the System
Module's P terminal did not agree with the predicted value for at
least 1000mS. This issue may be caused by an open-circuit of
the pump wiring (+BF2 and –P terminals) or an internal fault.
• Pump feedback does not increase more than 1.3V
• Pump feedback is less than 20% Battery Voltage
• Battery Voltage - pump feedback is greater than 4V
• ZAPI - HEALTH (Status LED) - ON
• The System Module detected excessive braking current for more
than 5000mS. This can be caused by transporting an excessive
load on a steep grade. Alternately, this may indicate an internal
fault.
• ZAPI - HEALTH (Status LED) - ON
3121166