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Curtis PMC 1297 Manual
20
Preliminary on Verso page is set with right edge at 7 and 7/8,
and the top (as on the Recto page) at 1/4.
CONTACTOR, SWITCHES, and OTHER HARDWARE
Main Contactor
A main contactor should be used with the 1297 controller. Otherwise, the
controller’s fault detection will not be able to fully protect the controller, traction
system, and hydraulic system from damage in a fault condition. The contactor
allows the controller and both motors to be disconnected from the battery. This
provides a significant safety feature, because it means the battery power can be
removed if a controller or wiring fault results in battery power being applied to
either motor inappropriately.
A single-pole, single-throw (SPST) contactor with silver-alloy contacts,
such as an Albright SW180 or SW200 (available from Curtis), is recommended
for use as the main contactor. The contactor coils should be specified with a
continuous rating at the nominal battery pack voltage.
The 1297 controller provides a low-side contactor coil driver (at J1 Pin 17)
for the contactor. The driver output is rated at 2 amps, is overcurrent protected
at 3 amps, and is checked for open coil faults. An active clamping circuit at 70 V
provides fast turn-off and protects the driver from inductive voltage kickback
spikes. The controller also performs a welded contactor check and a missing
main contactor check each time the interlock switch is engaged. Controller
output is inhibited if these contactor checks are not passed.
For information on programming the various contactor-related param-
eters, see Section 3
C
, page 57.
Keyswitch and Interlock Switch
The vehicle should have a master on/off switch to turn the system off when not
in use. The keyswitch input provides logic power for the controller.
The interlock switch—which is typically implemented as a tiller switch,
deadman footswitch, or seatswitch—provides a safety interlock for the system.
The keyswitch and interlock switch provide current to drive the main
contactor coil and the valve solenoid coils as well as the controller’s internal
logic circuitry, and must be rated to carry these currents.
Forward/Reverse, Lift/Lower, Mode, Emergency Reverse,
Horn, Lift Limit, Coast, and Pick Switches
These input switches can be any type of single-pole, single-throw (SPST) switch
capable of switching the battery voltage at 25 mA. Typically the Emergency
Reverse, Horn, and Pick switches are momentary switches, active only while
they are being depressed.
Circuitry Protection Devices
To protect the control circuitry from accidental shorts, a low current fuse
(appropriate for the maximum current draw) should be connected in series with
the battery feed to the keyswitch. Additionally, a high current fuse should be
2 — INSTALLATION & WIRING: Switches, etc.