4
6. Indicator Light, Traction Motor. This light
will illuminate with another warning light if a fault
occurs in the traction motor. Example: If the brush
wear sensor is activated in the motor, the warning
light,brushwear(7)willgo“ON”andtheindicator
light for the traction motor will show which motor
has the problem.
7. Indicator Light, Hydraulic Motor. This
light will illuminate with another warning light if a
fault occurs in the hydraulic pump motor. Example:
If the temperature over limit switch closes in the
motor, the warning light, motor temperature over
limit (10) will go “ON” and the indicator light for
the hydraulic motor will show which motor has the
problem.
8. Warning Light, Motor Temperature Over
Limit. The traction motor and the hydraulic
pump motor have thermal switches inside the
motors.Whenthe temperature increasestothe limit
set by the manufacturer of the motor, the thermal
switch closes and the warning light on the
instrument panel display illuminates. The indicator
light for traction motor (8) or for the hydraulic
motor (9) will show which motor has the problem.
The travel speed will also be decreased.
9. Indicator Light, Hourmeter: When the
hourmeter indicator is illuminated, the status code
will display the operating time of the lift truck. The
hourmeter indicator lamp is illuminated for four
seconds after the key has been turned “OFF”. If
thereisanhourmeter for thehydraulicpumpmotor,
it will display for another four seconds.
10. Indicator Light, Fault: The fault indicator
light will flash if the control card senses a symptom
or a malfunction with the lift truck. A status code
number will appear on the digital display of the
status code indicator. The status number will be
preceded by a dash (–) in the left digit position.
11. Indicator Light, Battery Function: The
battery function indicator will flash when the status
code indicator reads 19 (battery is approximately
70% discharged). The lift pump circuit will be
disabled at a display of 10 (approximately 80%
discharged).
PRINTED CIRCUIT BOARDS
There are two printed circuit boards used to control
some of the electrical and hydraulic functions of the lift
truck. The steering angle control board is located in the
rear compartment and the lift pump control board, for
the hydraulic control circuit, is located above and be-
hind the hydraulic control valve.
The lift pump control board has been designed with test
pointstoprovide foreasychecking ofthedifferent elec-
trical circuits controlled by the printed circuit board.
Steering Angle Control Board
(See FIGURE 3)
The steering angle board is located in the rear compart-
ment. It is installed with the components facing down-
ward over the steering axle assembly. Optical switches
onthesteeringanglecontrolboardareusedtodetermine
steeringangle.Inaddition,separatefunctionsrelativeto
lift pump operation and lift interrupt (contactor con-
trolled lift pump motor only) are controlled. An internal
voltage regulator allows dual voltage operation (36 or
48 volts).
The steering angle board performs several functions:
1. Monitors steering angle and supplies input to
the SCR traction control for drive motor cutout and
reversal during turns. Signals are generated to
indicate left or right, and 60 or 90 turns.
Optical switches are mounted on the steering angle
board. and an interrupter (shade) is mounted to the
steering axle assembly to sense steering angle.
1
369
12
OPT1
OPT2
OPT3
OPT4 DS1
P1
BOTTOM VIEW AS INSTALLED
FIGURE 3 – STEERING ANGLE CONTROL
BOARD
2. Energizes the lift pump contactor, when
signaled by the lift pump control board.
(Contactor controlled lift pump motor only.)
The optical switches on the lift pump control board
supply an input to the steering angle board. A
portionofthesteeringangleboardisusedtoprocess
