JLG 3969electric ANSI Service Manual - Manual (Page 16)

SECTION 2 - PROCEDURES
2-4
– JLG Sizzor– 3120768
2.6 COMPONENT FUNCTIONAL
DESCRIPTION
Hydraulic Pump
The single stage gear pump is attached to the electric
motor located on the right rear of frame.
Manual Descent Pump
The manual operated hand pump is located on the right
rear of frame behind ground control station.
2.7 WEAR PADS
The original thickness of the sliding wear pads is 5 in (12.7
mm). Replace sliding pads when worn to 4.7 in (11.9).
2.8 MOTOR CONTROLLER - MODES OF
OPERATION
Traction Motor Drive
Drive in either forward or reverse will start only if the fol-
lowing conditions are satisfied:
1. Function switches off.
2. No procedure or diagnostic faults present.
3. TEB operate
The function is selected in a 3-second window after the
TEB has been momentary closed.
The function is selected in a 10-second window after the
TEB has been permanently closed.
Another function was operated less than 3-seconds
before.
4. FWD or REV selected as appropriate.
Once in “drive” mode, activating a function switch shall
not cause drive mode to be exited, the pump/traction con-
tactor drive shall not be energized it will be left at the trac-
tion position. If a function switch is selected during
traction, a procedure fault will occur when neutral is
selected, remaining until a function switch and both direc-
tions are no longer selected.
When neutral is selected, the controller will control
smooth stopping of the machine, using plug braking,
before the electric brake is allowed to operate.
If a function switch is activated in neutral, when the vehicle
has stopped and the brake is applied, then pump mode
will become operational.
Pump Motor Drive
Pump motor drive will start only if the following conditions
are satisfied:
1. FWD and REV switch off.
2. Traction mode off (brake applied).
3. TEB operate
The function is selected in a 3-second window after the
TEB has been momentarily CLOSED.
The function is selected in a 10-second window after the
TEB has been permanently CLOSED.
Another function was operated less than 3-seconds
before.
Pump drive shall only be enabled when the direction
selector inputs are in neutral and the machine is station-
ary. Once pump drive mode has been entered, then the
status of the direction selector inputs shall no longer inter-
lock pump operation. If a direction switch is selected dur-
ing pump drive, a procedure fault will occur when the
function switch is no longer selected, remaining until both
directions and the function switch are no longer selected.
2.9 FEATURES
Features in Traction Mode
Maximum Speed Control.
The controller incorporates a function to limit the maxi-
mum speed of the machine to a percentage of maximum
possible speed. The function operates in such a manner
as to control vehicle speed by limiting the percentage on
of the switching device to keep the machine speed below
the maximum permitted value or, if required, to apply vari-
able plug braking to restrict machine speed when travel-
ing down a grade. The speed is controlled based on the
percentage of accelerator input.
Features in Pump Mode
1. Proportional Control of Pump Motor Speed - The
pump motor speed shall be controlled by varying
the percentage on of the switching element in rela-
tion to a separate pump accelerator input.
2. Soft Start - The pump motor speed control incorpo-
rates a “soft start” facility by applying acceleration
delay to changes in the applied percentage on of
the switching element.