18 Controls Capability (cont.) (1) Calibration current output is set by the OEM when calibrating the controller. NOTE: Once specified, these can be factory preset by Concentric. (2) The factory setting for the ramp time for the digital inputs is 2.5 seconds. The factory setting for the ramp time for the temperature sensor inputs is 1 second. If other ramp times are required, specify the ramp times when ordering the controller on Page 19. Inputs to Controller Controller Output (Run Mode) Valve Output Fan Speed Temperature Sensor (< min. temp. setpoint) Maximum current output Fully open Idling speed Temperature Sensor (> min. temp. setpoint) Current ramps over 1 second to the calibration current output (setting. Proportional control occurs when the temp. sensor inputs fall within the min. and max. temp. setpoints of the controller. The controller prioritizes temperature sensor inputs over the digital inputs (priorities are factory set to suit application). Pressure setting established during calibration Starting fan speed (the starting point for proportional control of fan speed) The speed of the fan will vary linearly between the starting fan speed (set during calibration of the controller) and maximum fan s peed. Temperature Sensor (> max. temp. setpoint) 0 Amps Pressure setting when controller has 0 current output (Closed) Maximum fan speed Digital Input 1 ON Ramps (2) from maximum current output to calibration current output Pressure setting established during calibration Fan runs from idling speed to starting fan speed Digital Input 1 OFF Ramps to maximum current output (as long as min. temp. setpoint is not exceeded) Valve returns to fully open position Fan returns to idling speed from starting fan speed Power Loss or No Inputs to the Controller 0 Amps Pressure setting when controller has 0 current output (Closed) Maximum fan speed quality products for mechanical & fluid power jbj Techniques Limited, www.jbj.co.uk quality products for mechanical & fluid power ~ jbj Techniques Limited, www.jbj.co.uk UK distributor for Concentric Hydraulics
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