Return to TOC Curtis 1239E-1269E Manual, os 37.0 RevA – May 2021
2 — INSTALLATION AND WIRING
pg. 11
CONTROLLER WIRING: BASIC CONFIGURATION
A basic wiring diagram is shown in Figures 5 and 6. e throttle and brake are shown in the diagram
as 3-wire potentiometers; other types of throttle and brake inputs are easily accommodated, and are
discussed in the following throttle wiring section.
e main contactor coil must be wired directly to the controller as shown in Figure 5 to meet EEC
safety requirements. e controller can be programmed to check for welded or open (did not close)
contactor faults and uses the main contactor coil driver output to remove power from the controller
and motor in the event of various other faults. If the main contactor coil is not wired to Pin 6 of the
35‑pin connector as shown, the controller will not be able to open the main contactor in serious
fault conditions and the system will therefore not meet EEC safety requirements.
e internal capacitor precharge function is performed with an external relay and precharge resistor.
No internal precharge feature is provided in the 1239E/1269E controllers. Precharge decreases main
contactor arcing and can increase the contactor’s life.
Note that the basic wiring diagram is designed for generic applications and may not fully meet
the requirements of every vehicle systems. These controllers have very flexible I/O and wiring
congurations; Please contact the Curtis distributor or support engineer to discuss a particular application.
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