The Mark VII Series electronic controller from Philadelphia Gear controls variable-speed and soft-start hydroviscous drives. To maintain a desired clutch output condition, whether it be speed, torque (load), flow or pressure, it works as a closed-loop feedback device using the clutch output shaft controlled parameter as feedback. The input command signal is automatically and continually compared to the output shaft controlled parameter, an error signal is generated, and the clutch clamping pressure continually self-adjusts to maintain input command signal. Output parameter regulation is accurate within plus or minus 0.1 percent, and can monitor low oil pressure, high oil temperature, as well as programmed acceleration and deceleration rates. Interactive control of multiple clutches or clutch-brake combinations is another programmed capability. It is user-friendly and no on-site software programming is necessary. 800/766-5120;

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