Accessory Card — American Control electronics
The CMC Series by American Control Electronics is a standalone accessory card that provides an adjustable current limit alarm for any DC motor controller, preventing false alarms due to predictable increases in current draw. Compatible with any DC motor controller, the card is wired in series with a DC motor using a jumper to set a base current limit trip point. An onboard “Offset” trim pot can finely adjust the trip point, while a “Time Delay” trim pot establishes how long the motor’s amperage draw must exceed the trip point before determining that a fault has occurred. When the card determines a fault exists, it will close a normally open (N.O.) output contact and open another normally closed (N.C.) output contact. These contacts are used as preconfigured switches to turn on or off other circuits. The card is set to latch or configured to automatically reset once current falls below an adjustable “Hystersis” setting.