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ACC7200 Air Compressor Controller User Manual Page 66 of 77
positive and negative to controller’s positive and negative input ports in order to prevent charger
disturbing the controller’s normal working.
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SPEED SENSOR INPUT: Speed sensor is the magnetic equipment installed in the starter for
detecting flywheel teeth. The connection wires with controller should apply 2-core shielding line.
The shielding layer should be connected to No. 22 terminal in the controller and another side is
hanging up in the air. The other two signal wires are connected to No. 21 and No. 22 terminals. The
output voltage of speed sensor should be within AC (1~24)V (effective value) during the full speed
range. AC12V is recommended (at rated speed). When speed sensor is installed, let the sensor
spun to contacting flywheel first, then, port out 1/3 lap, and lock the nuts of sensor at last.
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OUTPUT AND EXPAND RELAYS: All controller outputs are relay contact output type. If expansion
relay is needed, please add freewheel diode to both ends of expansion relay’s coils (when relay
coils have DC current) or, increase resistance-capacitance return circuit (when relay coils have AC
current), in order to prevent disturbance to the controller or other equipment.