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Curtis 1239E-1269E Manual, os 37.0 RevA – May 2021
SWITCH INPUT WIRING
The following inputs are dedicated to specific functions when the parameter settings are as shown:
EXTERNAL PRECHARGE RESISTOR
When precharge is enabled, output driver 3 (pin 4) is dedicated to the external precharge relay. The
relay coil must be rated for operation at 12 V dc. The contacts of the relay should be rated for the
appropriate high power voltage and a current rating of 5 A.
The external precharge resistor must have a nominal resistance of 40 to 50 Ohms, with a tolerance
of ± 10% or less. The continuous power rating must be at least 20 Watts, and the short time overload
power rating must be at least 100 Watts for 5 seconds. An internal algorithm protects the precharge
resistor from overheating.
NOTICE
If the wrong resistor is used, damage could result.
LOW POWER CIRCUIT SPECIFICATIONS
The input/output circuits wired to the 35-pin connector can be grouped by type as follows; their
electrical characteristics are discussed below.
• Low Power Ground
• Digital Inputs
• Digital and PWM Outputs
• Analog Inputs
• Analog Output
• Power Supply Outputs
• KSI and Coil Return Inputs
• Throttle and Brake Inputs
• Communications Ports I/O
• Position Feedback Inputs
Low Power Ground
A low power ground must be provided from the external 12V power ground source. This 12V-ground
is used for all low power circuits, and must also be connected to the vehicle chassis (or the 12V-ground
reference plane in the case of composite vehicles). In order to maintain electrical isolation, do not
connect this 12V-ground to the high power battery ground (B–). If splices are made to the low power
source's ground wire, they should be made near the controller connector pin 7.
pg. 14
Switch 3: Interlock input if Interlock Type = 0
Switch 7: Forward input if Throttle Type = 1–3
Switch 8: Reverse input if Throttle Type = 1–3
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2 — INSTALLATION AND WIRING
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