Curtis 1268-5403 SepEx Controller, 36/48V 400A, 0-5k Throttle
- Replaces a controller whose label reads Curtis 1268-5403
- New Curtis SepEx controller, 36 to 48V and 400A, with regenerative braking
- For a 3-wire potentiometer or 0-5V throttle, with a built-in pre-charge resistor
- Does not fit: vehicles with an ITS throttle sensor
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Overview
The Curtis 1268-5403 is a new 36 to 48V, 400A SepEx controller: a programmable controller for separately excited motors, with regenerative braking. It is the 1268 model for a 3-wire potentiometer (0-5k) or 0-5V throttle.
We list it by exact label match. It replaces a controller whose label reads Curtis 1268-5403. Curtis builds a number of 1268 models for different vehicles and throttles, so the part number on your label is the fitment.
Curtis designed the 1268 for heavy-duty golf carts, personnel transports and utility vehicles. It has a built-in pre-charge resistor, a status LED that flashes fault codes, a speed sensor input and a driver for a walk-away relay or electromagnetic brake.
Curtis programmable controllers are set up for the vehicle they go into. After you order we email you to confirm your vehicle and pack voltage, so it arrives set up for it.
- Voltage
- 36V or 48V
- Controller
- 400A
Manuals and documents
Compatibility
Fits
- Universal by controller Vehicles whose controller label reads Curtis 1268-5403
- Stock controller
- Curtis 1268-5403
- Voltage
- 36V or 48V
- Years
- Identify by controller
Separately excited motor with a 3-wire pot or 0-5V throttle
Does not fit
- Carts whose controller label reads something other than Curtis 1268-5403
- Vehicles with an ITS throttle sensor, which take one of the 1268 models built for ITS
- Series wound motors, because the 1268 drives separately excited motors only
- AC drive carts
- Gas carts
Have a 1268 with a different number on the label? Send us a photo and we will tell you what matches. support@golfcartlab.com
How to confirm it fits
Read the label on your existing controller. This part replaces a Curtis 1268-5403.
Check the throttle: this model takes a 3-wire potentiometer or a 0-5V signal, not an ITS sensor.
Compare the mounting space with the drawing: a 229 x 178 mm footprint with four holes 210 x 159 mm apart.
Send us a photo of the label if it is hard to read and we will match it for you.
Buying guide: A Beginner’s Guide to Replacing a Failed Golf Cart Controller
What's in the box
- One Curtis 1268-5403 controller, new
Completes the install
Optional
The throttle on your vehicle is reused. This is the matching new one if yours needs replacing.
Specifications
- Brand
- Curtis
- Manufacturer part number
- 1268-5403
- Type
- SepEx controller for separately excited motors, with regenerative braking
- Nominal battery voltage
- 36V or 48V
- Armature current, 2 minute rating
- 400A
- Field current, 2 minute rating
- 50A
- Throttle
- 3-wire potentiometer (5k to 10k) or 0-5V
- PWM operating frequency
- 16 kHz
- Logic connector
- J1, 24-pin Molex Mini-Fit Jr.
- Other connectors
- J2 6-pin (speed sensor) and J3 4-pin (programmer)
- Power terminals
- B+, B- and M- on M8 studs; F1 and F2 on M6 studs
- Terminal torque, maximum
- M8 power studs 20 Nm (15 ft-lb); M6 field studs 16.3 Nm (12 ft-lb)
- Pre-charge resistor
- Built in
- Diagnostics
- Built-in status LED flashes two digit fault codes
- Operating ambient temperature
- -40 to 50 C (-40 to 122 F)
- Heatsink overtemperature cutback
- Starts at 85 C (185 F), cutoff at 95 C (203 F)
- Environmental rating
- IP64 and IP67
- Weight
- 3.9 kg (8.5 lb)
- Dimensions (L x W x H)
- 229 x 178 x 81 mm (9.0 x 7.0 x 3.2 in.)
- Mounting
- Four 7.1 mm (0.28 in.) holes, 210 x 159 mm (8.25 x 6.25 in.) apart
- Condition
- New
Requirements and install notes
Disconnect the battery pack before you touch any terminal.
Remove any pre-charge resistor fitted across the solenoid. This controller has one built in, and an external resistor can damage it.
Check the motor with an ohmmeter first, with the motor disconnected: A1 to A2 roughly 0.2 to 2 ohms, F1 to F2 roughly 0.8 to 3 ohms, A1 to F1 open, and F1 to the motor case above 5 megohms.
Check the main solenoid: the coil should read 100 to 250 ohms depending on the type, and the closed contacts less than 0.3 ohm. A suppression diode goes with its non-banded side to the wire from J1 pin 17.
Throttle connections: Pot High on J1-13, wiper on J1-15 and Pot Low on J1-14. The wiper should read under about 0.5V with the pedal up and over about 4V with the pedal fully down.
Mount the controller where its top stays reachable. The programmer port and the status LED are both on top. Any orientation is allowed, and Curtis asks for a spot that stays as clean and dry as possible.
Keep the power cables clear of the cable-free zone marked on top of the controller, and stay within the stud torque given in the specifications.
When the controller sees a fault, the status LED flashes a two digit code, for example 3,2 for a welded main contactor. The full code table is in the manual above.
FAQ
What does SepEx mean?
Separately excited. The controller drives the motor armature and the field winding through separate outputs, which lets it reverse the motor and brake regeneratively without extra relays or contactors.
Can I use it in place of a different 1268 part number?
We list it only as a replacement for a controller labelled 1268-5403. Other 1268 models are set up for other vehicles and throttles. Send us your label and we will tell you what matches.
Is it programmable?
Yes. Curtis 1268 controllers are programmed with a Curtis handheld programmer or PC programming station, which also reads diagnostics. The programmer is a separate tool.
Does it need a pre-charge resistor on the solenoid?
No. It has one built in. Take any external resistor off the solenoid before you fit it.
Warranty
This part is new and covered by our returns and refunds policy. We handle any claim for a defective part directly with you. A controller damaged by a shorted motor, a failed solenoid or incorrect wiring is not covered, which is why the checks above come first.
Manufacturer part reference
- Manufacturer part number
- 1268-5403
- GCL SKU
- 76-1268-5403
