JLG 1230ES Service Manual - Manual (Page 36)

SECTION 3 - THEORY OF OPERATION - 1230ES
3-6 – JLG Lift – 3121222
apply all available Battery power to the pump motor (as in
Lift Up at full speed).
When the Control System is energized, the voltage at the
P Terminal will be approximately +24V (referenced to -B)
when the pump is static. The P Terminal will be approxi-
mately at +1V (referenced to -B) when the pump is run-
ning at full speed (Lift Up from Ground Mode).
Personalities
Lift system Personality settings can be changed via ANA-
LYZER -> PERSONALITIES -> LIFT:
• ACCEL - Time to ramp from 0% to 100% command
• DECEL - Time to ramp from 100% to 0% command
• UP MIN - Minimum pump speed up (Creep)
• UP MAX - Maximum pump speed up
• DN MIN - Minimum pump speed down (Creep)
• DN MAX - Maximum pump speed down
Interlocks
Lift up will be prevented under the following circum-
stances.
• Vehicle is tilted, elevated and ANALYZER -> MACHINE
SETUP -> TILT CUTOUT is set to YES.
• Charging of the vehicle’s battery is in progress and
ANALYZER -> MACHINE SETUP -> CHARGER INTER-
LOC is set to DRV & LIFT UP.
3.7 STEER
Steering is actuated by a double action hydraulic cylinder.
To change steering angle of the drive wheels, the steer left
or steer right solenoid is energized and the pump is ener-
gized. Pressure is applied to one side of the piston and
drained from the other. The pump speed, and thereby the
rate of steering angle change, is adjusted based on drive
speed. This adjustment is modified by steer personality
settings.
Figure 3-6. STEER SYSTEM
Personalities
Steer system Personality settings can be changed via
ANALYZER -> PERSONALITIES -> STEER:
• STATIC - Pump commanded % power when drive com-
mand is 0%
• DRIVE - Pump commanded % power when drive com-
mand is 100%
Interlocks
Steering is prevented whenever conditions are present to
prevent drive. See Interlocks on Pg. 4
Figure 3-5. Hydraulic Pump Electrical Schematic -
1600423 (SEVCON) Power Module
Series DC
Pump Motor
Line Contactor
24V
+B
–B
P
Power Module