17 TYPICAL RATINGS Supply Voltage: 9–32 VDC Control Input Signal Options: 10 K external potentiometer (accepts 5K to 50K pots), or 0–5 VDC signal, 0-10 VDC signal, or 0–20 mA current signal. Input Resistance: Voltage Control: 125K Ohms; Current Control: 50K Ohms Ramp Up and/or Down: 0.01–5.0 seconds (independently adjustable) Operating Conditions: –20° to 85°C (-4º to 185ºF); 0 to 85% relative humidity REMOTE MOUNTED CONTROLLER (See Page 20 for illustration) Description: These controllers are designed for multiple input temperature control. Power supply input is 12 or 24 VDC (nominal). The controller accepts up to three analog temperature sensor inputs and up to two digital inputs. The OEM can select the number of temperature inputs by setting a DIP switch on the controller. NOTE: Once specified, these can be factory preset by Concentric. The temperature range accepted by the controller is set by the sensor specifications. See Page 19 for sensor input requirements. The controller compares the actual value of the temperature inputs with programmed setpoints (specified by the OEM) to generate a proportional current output to the valve. The valve proportionally controls the pressure at the fan motor and therefore mo-tor speed. Proportional control occurs when the temperature sensor inputs fall within the minimum and maxi-mum temperature setpoints of the controller. Turning on the digital input causes the controller to ramp for a 2.5 second period from maximum current output (idle fan speed) to the necessary current output required to achieve set point fan speed. The fan cools by operating between a starting fan speed and a maximum fan speed, which are determined by the cooling system layout. These requirements should be specified on Page 19 (sensor inputs). Calibrating the controller potentiometer and tuning the pressure setting of the valve sets both speeds. Digital inputs can also be set to actuate full fan speed mode when required for engine retarding or other applications where high heat loads are generated. Idling speed is the mode of operation of the fan when it is not required to cool. The controller and proportional valve are designed to provide a maximum fan speed in the cooling circuit in case of a power loss. Overcurrent protection is provided. Once an overcurrent situation is detected, the controller output turns off for several cycles of 10 msec. until the situation corrects itself. If the overcurrent situation continues, the controller will eventually shut off completely to allow the fan to run at maximum speed and cool the system. The fan controller has two modes of operation; calibration and run. A DIP switch sets the mode of operation. In calibration mode, the OEM powers the controller and adjusts the calibration potentiometer until the fan is running at the desired rpm corresponding to the minimum temperature setpoint programmed in the controller (the starting speed). This is the speed to which the fan should ramp when any of the input temperatures go above the minimum temperature setpoint or the digital input turns on. Once the unit is calibrated, the OEM selects run mode. In run mode, changing the setting of the potentiometer will have no effect on the output. NOTE: Once specified, these can be factory preset by Concentric. The controller is packaged for the rugged mobile environment. OEM specific packaging and connection styles are available. For higher volume applications, contact Concentric. Controls Capability (cont.) 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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