SECTION 3 - THEORY OF OPERATION - 1230ES
3-4
– JLG Lift –
3121222
The Field Windings also provide direction reversal for trac-
tion. When driving forward, MOSFET switches 1 and 4 turn
On to apply positive potential to F2 and ground potential
to F1. In reverse, MOSFET switches 2 and 3 turn On to
apply positive potential to F1 and ground potential to F2.
Theses switches are pulse-width modulated by the Power
Module to maintain a fixed relationship between Field and
Armature Current.
Two electrically-released parking brakes are mounted to
the rear of the drive motors. The Ground Module ener-
gizes the two 24V electro-magnets when appropriate to
allow vehicle motion. The parking brakes can be released
electrically for emergency vehicle towing.
Personalities
Traction system Personality settings can be changed via
ANALYZER -> PERSONALITIES -> DRIVE:
•
ACCEL - Time to ramp from 0% to 100% of command
•
DECEL - Time to ramp from 0% to 100% of command
•
MINIMUM - Minimum drive speed (Creep)
•
MAXIMUM - Maximum drive speed when platform is
stowed
•
ELEV. MAX - Maximum drive speed when platform is
elevated
Interlocks
As the machine travels down an incline the drive power
output will be reduced proportionally to avoid overspeed-
ing the vehicle. A bad tilt sensor will force the control sys-
tem to assume maximum incline and reduce drive power
accordingly.
Creep mode (reduced drive speed) will be active if the
control system determines the platform is elevated. Drive
may be prevented by a different interlock, however.
Drive will be prevented if any of the following occur:
•
Vehicle is tilted, elevated and ANALYZER -> MACHINE
SETUP -> TILT CUTOUT is set to YES.
•
Batteries are being charged (0V is applied to ground
board J1-29)
•
Vehicle is elevated above the calibrated Drive Cutout
height and ANALYZER -> MACHINE SETUP -> DRIVE
CUTOUT is set to YES.
Figure 3-3. Drive Motors Schematic - 1001092456 (ZAPI) Power Module
+
24V
+
+
+
Line Contactor
Right Field Winding
Left Field Winding
Power Module
Left
Armature
Right
Armature
+
+
BF1
BF2
B
+B
T
F1
F2
Field
MOSFETS
Armature
MOSFET
Shunt
Summary of Contents for 1230ES
Page 1: ...AS NZS Service and Maintenance Manual Model s 1230ES P N 3121222 June 22 2017 ...
Page 2: ...NOTES ...
Page 24: ...SECTION 1 MACHINE SPECIFICATIONS 1 12 JLG Lift 3121222 NOTES ...
Page 32: ...SECTION 2 GENERAL SERVICE INFORMATION 2 8 JLG Lift 3121222 NOTES ...
Page 78: ...SECTION 4 BASE COMPONENTS 4 40 JLG Lift 3121222 NOTES ...
Page 104: ...SECTION 5 CONTROL COMPONENTS 5 26 JLG Lift 3121222 NOTES ...
Page 158: ...SECTION 8 DIAGNOSTIC TROUBLE CODES 8 22 JLG Lift 3121222 NOTES ...
Page 198: ...SECTION 9 GENERAL ELECTRICAL INFORMATION SCHEMATICS 9 40 JLG Lift 3121222 ...
Page 199: ...SECTION 9 GENERAL ELECTRICAL INFORMATION SCHEMATICS 3121222 JLG Lift 9 41 ...
Page 200: ...SECTION 9 GENERAL ELECTRICAL INFORMATION SCHEMATICS 9 42 JLG Lift 3121222 ...
Page 202: ...SECTION 9 GENERAL ELECTRICAL INFORMATION SCHEMATICS 9 44 JLG Lift 3121222 NOTES ...