EM-285 DC-MOTOR SPEED REGULATOR - Panel mountable - Small size - Good speed regulation - Load comp. adjustable Rxl - Adjustable current limit - Overheating protection EM-285 is a PWM-based DC-motor driver. The materials and features meet the industrial standards. Motor voltage is regulated against supply voltage changes, and there is also a load compensation adjustment ( Rxl ), which enables steady speed during motor loading. Because of these features EM-285 can offer a good DC-motor speed regulation. In the power line of EM-285 there is an overvoltage limit, which trips the power stage in case the voltage would try to rise too high. This is possible in deceleration situation (emf voltage generation in braking). If potentiometer is turned on zero-position, the driver will make a shorting on motor wires for 5s. This creates a powerfull braking (dynamic brake) which can be used to stop or lower the motor speed fast. The current limit and potentiometer range can be adjusted with on-board trimmer potentiometer. The device is EMC measured and meets industrial requirements in typical installation. EM-285 is easy to mount to a D10mm hole in the assembly panel. The power stage is not short circuit protected, so it is recommended to use an external fuse in application supply wiring. TECHNICAL DATA Overvoltage shut down 38V Undervoltage shut down 10V Motor current cont. max 20A ( Ta<50°C ) Motor current peak max 30A ( 10s. ) Motor and supply connectors 2.5mm VOLTAGE SENSE

Recommended supply voltage 12-32Vdc filtered DC Ripple should be less than 20% at max. power. At high power use the supply wires should be as short as possible. The use of external fuse is recommended. ATT. Wrong supply polarity can damage device. ATT. Driver has no inbuilt fuse. Select operation frequency. At 2kHz there are lower power losses and lower EMC emission level, but some cases there can occur audiable noise. Range trim is used to scale the usable speed adjust range. Current limit ( l-lim ) limits the motor current, in other words the motor torgue. This adjustment should be used to...