HP A0554832 Chapter 4: Operation, 4-1Panel Buttons, Indicator Lights, and Switches

Chapter 4: Operation

4-1 Panel Buttons, Indicator Lights, and Switches

Microprocessor Controllers

Standard chillers use a microprocessor-based PID controller. These controllers are modular, self-contained units that can slide from their mounting housing. They are factory set and adjusted; no field adjustment to the internal controls are necessary. Their standard operation range is 30ºF to 65ºF (-1ºC to 18ºC). See Figure 7: Typical Portable Chiller Microprocessor Controller.

E5CK Controller

Indicator	Name	Description
PV	Process Value LED	During normal operation, the large red PV LED
		on the controller displays the actual process
8.8.8.8
		temperature at the “To Process” thermocouple. It
		also lists parameter symbols during setup and
		error messages if an error occurs
SV	Set Value LED	During normal operation, the green SV LED on
		the controller displays the process set point you
8.8.8.8
		want the chiller to maintain. It also displays
		parameter and pre-set function values during set
		up.
	Out 1 LED	The orange OUT1 LED lights when the control
OUT1		output energizes the hot-gas bypass solenoid valve
	Out 2 LED	The orange OUT2 LED lights whenever the
OUT2		process temperature is two degrees or more above
		the “To Process” setpoint. The compressor then
		comes on and runs until the temperature at the “To
		Process” thermocouple is two degrees below the
		setpoint.
	MANU LED	The orange MANU LED is not used and does not
MANU		light.
	Stop LED	The orange STOP LED is not used and does not
STOP		light.
	RMT LED	The orange RMT LED is lit during remote
RMT		operation.
AT	AT LED	The orange AT LED flashes during auto-tuning.

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