Curtis 1214-/15-/19-8 Manual 13
2 — INSTALLATION & WIRING
CONTACTORS, SWITCHES, and OTHER HARDWARE
Main Contactor
A main contactor allows the controller to be disconnected from the battery. In
24V applications a main contactor is optional, but in 36–48V applications a
main contactor is required. A heavy-duty single-pole, single-throw (SPST)
contactor with silver-alloy contacts is recommended.
After initial closing of the contacts, inrush currents flow as the controller’s
internal filter capacitors are charged. A 250Ω, 5W resistor can be used across the
contactor to precharge the capacitors and reduce the inrush current through the
contacts.
A built-in coil suppression diode is connected between the main contactor
coil output and the brake/seat switch input.
Forward/Reverse Contactors
For forward/reverse, a paired single-pole, double-throw (2×SPDT) contactor is
recommended. With 4-terminal split field motors, two single-pole, single-throw
(SPST) contactors are typically used. The coil voltage should match the vehicle
voltage. The maximum allowed coil current is 1 ampere.
A built-in coil suppression diode is connected between each forward/reverse
contactor coil output and the brake/seat switch input.
Forward/Reverse, Emergency Reverse, and Mode Selection Switches
These switches can be any type of single-pole, single-throw (SPST) switch
capable of switching the battery voltage at 10 mA.
Keyswitch
The vehicle should have a master on/off switch to turn the system off when not
in use. The keyswitch provides logic power for the controller, and coil current for
the contactors. The keyswitch must be capable of carrying these currents.
Circuitry Protection Devices
For reverse polarity protection, a diode should be added to the control circuit. It
must be sized appropriately for the maximum contactor coil currents. To protect
the control wiring from accidental shorts, a low current fuse (appropriate for the
maximum current draw) should be connected in series with the battery feed.
These devices are both shown in the wiring diagrams.
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