Curtis PMC 1297 Manual
21
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.
2 — INSTALLATION & WIRING: Switches, etc.
wired in series with the main contactor to protect the motors, controller, and
batteries from accidental shorts in the power system. The appropriate fuse for
each application should be selected with the help of a reputable fuse manufac-
turer or dealer. The standard wiring diagrams (Figures 3 and 4) show the
recommended location for each fuse.
Valves
The hydraulic line’s load holding valve (if used) and lowering valve should be
large enough to provide adequate flow when open.
The load holding valve’s solenoid coil should be rated at the nominal
battery voltage of the system and must not exceed the 2 amp rating of its driver.
The lowering valve solenoid coil should be rated at or below the nominal
battery voltage and should be capable of opening the valve completely using not
less than half an amp of current and not more than 3 amps.
The 1297 controller provides a low-side load-holding valve solenoid
driver at J1 Pin 18; this driver output is rated at 2 amps, and is overcurrent
protected at 3 amps. A low-side lowering valve solenoid driver is provided at
J1 Pin 7; this driver output is rated at 3 amps, is overcurrent protected, is
checked for open coil faults, and can drive either a proportional lowering valve
or a simple open/closed lowering valve.
An active clamping circuit at 70 V provides fast turn-off and protects the
drivers from inductive voltage kickback spikes.
For information on programming the various valve-related parameters,
see Section 3B, page 49.
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