Introduction
The 7CH150N is a one-quadrant chopper controller designed for PM and 3 clamps DC motors, powered by 12/24/36V batteries. It features a microprocessor for digital control of speed, current regulation, and diagnostics for failures and wiring issues. The power stage uses a MOSFET operating at 300 Hz, and the design complies with key EC standards.

Features
- Power Supply: 12V, 24V, 36V
- Rated Current: 50 A (dependent on power dissipation)
- Max Current: 150 A at 25°C
- Frequency: 300 Hz
- Operating Temperature: -10°C to 40°C
- Speed Reference Potentiometer: 1-5K
- Size: 145x145x70 mm
- Safety Features: Potentiometer fault, enable input, thermal protection at 90°C, output and MOSFET short circuit protection, key-handle sequence
- Calibration: Acceleration ramp (0.5-3 s), maximum speed, braking current at reverse

Installation
The chopper should be installed in a protected area, fixed on a metal surface to aid heat dissipation. If thermal protection frequently activates, additional cooling measures like a heat sink or fan are recommended. The controller can be made bi-directional with a suitable mechanical contactor.

I/O Connector
- Pin 1: Key switch input
- Pin 2: Forward switch
- Pin 3: Backward switch
- Pin 4: Positive potentiometer supply
- Pin 5: Central potentiometer
- Pin 6: Negative potentiometer supply
- Pin 7: Electrobrake coil output
- Pin 8: LED alarm
- Pin 9: Hour-meter output
- Pin 10: Speed reduction input
- Pin 11: Backward contactor coil
- Pin 12: Forward contactor coil

Alarms
Red LED blinking indicates various alarms:
- 1 blink: MOSFET short circuit
- 2 blinks: Forward switch on at power on
- 3 blinks: Backward switch on at power on
- 4 blinks: Potentiometer > 0.6V at power on
- 5 blinks: Breaking potentiometer > 13V
- 6 blinks: Both switches on
- Always on: Thermal protection
To reset alarms, ensure potentiometer and switches are in neutral (open) position.