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Temperature
Control
Fluid temperature control is achieved by activating a chilled-water solenoid
valve and a tank heater. PID microprocessor algorithms control both the valve
and heater, unless in the remote mode where control of the valve and heater
is from the host unit.
Flow Control
Flow control is achieved by adjusting the flow control valve to the desired flow
and pressure. The valve is located behind the front bottom access door.
Flow Monitors
Each recirculating THERMAL FLUID RETURN line is each equipped with a
flow sensor. The sensor confirms proper flow returning from your application.
The flow sensor provides an opto-isolated current sinking transistor output at
the P1 connector for flow rates above one gallon per minute. The signal is
absent at flow rates below one gallon per minute.
Each channels flow setpoint value can be changed or turned off for the full
operating range of the flow monitor, see page 14.
Low Level
Monitors
There are two level switches in the reservoir. When the fluid level drops to
3¾ gallons, the ADD FLUID lamp on the side of the unit will illuminate and a
signal is sent to the tool. If the fluid level should drop to 2.0 gallons, the
LEVEL FAULT LED illuminates and the heater is disabled.
If the fluid level drops to two gallons the LEVEL FAULT LED illuminates and
the heater is disabled. If a LEVEL FAULT occurs within three minutes after an
ADD FLUID fault, the unit shuts down and the LEVEL FAULT LED will flash. It
is not possible to start the unit in any mode with an active LEVEL FAULT. The
fault clears automatically once the reservoir is refilled. The ON/OFF button
must be pressed to start the unit.
Resistivity &
Temperature
Sensor
A resistivity and temperature sensor is located in the recirculating process
fluid outlet line. The sensor provides output voltages to J1 pins 7 and 8 which
are proportional to temperature and resistivity respectively.
Pin7
Temperature Readout 0 - 10V = 0 - 100°C
Pin6Temperature Readout Common
Pin8
Resistivity Out 0 - 16 megohm-cm 3.4 VDC full scale
Pin11
Resistivity Out Common
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