Curtis 1221 Permanent Magnet Motor Speed Controller (PMC)

Curtis PMC Models are advanced, programmable microprocessor based motor speed controllers which offer smooth, silent, cost-effective control of motor speed and torque. Four quadrant, full bridge power output stages provide for solid state motor reversing and full regenerative braking power. Model 1227 provides extensive standard features.

• Full bridge power MOSFET design provides infinitely variable forward, reverse, drive and brake control; silent high frequency and high efficiency operation.
• Current limited in both driving and regenerative braking.
• Load compensation stabilizes speed on ramps and over
  obstacles. Compensates for battery voltage, voltage drops,
  and motor resistance.
• Anti rollback/roll forward circuitry sets brake delay
  according to speed and direction for improved braking
  response and minimized rollback on hills, etc.