Andy Drummond Posted July 9, 2007 Report Share Posted July 9, 2007 Hi Would like to install an electric water pump into my race car. The pump speed (voltage) is proportional to the engine setpoint temperature. Specification of pump motor is 5 to 12 volts DC operating range, upto 2 amps. As the load is high, will need to install a solid-state relay. The solid-state relay will allow for PWM control. Is it possible for the Link to control the electric water pump? Need PWM control that has the following conditions, 1/ Proportional/Integral control, PI (don't need D its to hard to tune with little benefit) 6/ Time base or frequency (Hz). 3/ Selectable process variable (PV) (eg engine temp, rpm, IAT, etc). 2/ Setpoint parameter value (SP). Must be in the same units as the process variable. 5/ Control action either SP minus PV or PV minus SP. 4/ Output limit low (as %) and output limit high value (%). 7/ Enable PI control (on/off) (selectable) (eg continuous, Auxiliary output 1-11, Digital input 1-12, Internal output, etc. If the input or output is high then operate the PI/PWM (on) with the above parameters otherwise turn off PWM control (zero the PI output and disable PI equation). 8/ The control variable (CV) is the PI output as % of the time base (frequency). That is proportional PWM. All the above is generic and can be used for other devices now and in the future. Also you may consider adding some internal outputs that are used internally only (within the Links software only). These internal outputs can act like a normal general output with the standard operating conditions and then these internal outputs are selectable as part of the other outputs operating conditions. Benefit to you and the user is many different conditions can be cascaded allowing for multiple conditions without adding all the fields into one output conditions window. Regards Andy Quote Link to comment Share on other sites More sharing options...
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