Curtis PMC 1209B/1221B/1221C/1231C Manual
2
OVERVIEW
Working on electric vehicles is potentially dangerous. You should protect
yourself against runaways, high current arcs, and outgassing from lead acid
batteries:
RUNAWAYS — Some fault conditions could cause the vehicle to run out of
control. Jack up the vehicle and get the drive wheels off the ground before
attempting these procedures or any other work on the motor control
circuitry.
HIGH CURRENT ARCS — Electric vehicle batteries can supply very high power,
and arcs can occur if they are short circuited. Always open the battery circuit
before working on the motor control circuit. Wear safety glasses, and use
properly insulated tools to prevent shorts.
LEAD ACID BATTERIES — Charging or discharging generates hydrogen gas,
which can build up in and around the batteries. Follow the battery
manufacturer’s safety recommendations.
Wear safety glasses.
✓ Undervoltage cutback function protects against low battery voltage, includ-
ing low voltage caused by external loads
✓ Throttle pot fault circuitry shuts off the motor in the event of an open circuit
fault in the throttle or its wiring, to prevent runaway conditions
✓ Frequency shifting feature provides improved control of current limit at low
duty cycles [“C” models only]
✓ Simple installation with no adjustments required
✓ Tin-plated solid copper bus bars
✓ Push-on connectors for control wiring
Familiarity with your Curtis PMC controller will help you to install and operate
it properly. We encourage you to read this manual carefully. If you have
questions, please contact the Curtis office nearest you.
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