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Heating/Cooling control (OUT2)
• OUT2 side
Proportional band: 0.0 to 10.0 times OUT1 proportional band (ON/OFF action when set to 0.0)
Proportional cycle: 1 to 120 seconds
• Overlap band/Dead band setting range
Thermocouple, RTD inputs: –100.0 to 100.0
DC current, DC voltage inputs: –1000 to 1000 (The placement of the decimal point follows the selection)
• OUT2 output ON/OFF action hysteresis setting
Thermocouple, RTD inputs: 0.1 to 100.0
DC current, DC voltage inputs: 1 to 1000 (The placement of the decimal point follows the selection)
• Integral and derivative times are the same as those of OUT1.
• OUT2 action mode selection function
Air cooling (linear characteristic), Oil cooling (1.5th power of the linear characteristic),
Water cooling (2nd power of the linear characteristic)
• Output: Non-contact relay, Control capacity; 0.3A 250V AC
Serial communication
The following operations can be carried out from the external computer.
(1) Reading and setting of SV, PID and various set values
(2) Reading of the PV and action status
(3) Change of the functions
Cable length
Communication interface
Communication method
Communication speed
Parity
Stop bit
Communication protocol
Connectable number of units : Maximum 31 units to 1 host computer
Communication error detection : Parity, checksum (LRC, CRC)
11. Troubleshooting
If any malfunctions occur, refer to the following items after checking the power supply to the controller.
11.1 Indication
Problem
PV display is indicating [
[
] is flashing on the PV
display.
[
] is flashing on the PV
display.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
( )
( )
: Max. communication distance 1000m, Cable resistance; Within 50
: EIA RS-485
: Half-duplex communication start stop synchronous
: 2400, 4800, 9600, 19200bps (Selectable by keypad operation)
: Even, Odd and No parity (Selectable by keypad operation)
: 1, 2 (Selectable by keypad operation)
: Modbus RTU, Modbus ASCII (Selectable by keypad operation)
].
• Control output OFF function is working.
Press the
• Thermocouple, RTD or DC voltage (0 to 1V DC) is burnt out.
Change each sensor.
How to check whether the sensor is burnt out
[Thermocouple]
If the input terminal of the instrument is shorted, and if a value
around room temperature is indicated, the instrument is likely to
be operating normally, however, sensor may be burnt out.
[RTD]
If approx. 100
between A-B of the instrument and between B-B is shorted, and
if approximate 0
operating normally, however, the sensor may be burnt out.
[DC voltage (0 to 1V DC)]
If the input terminal of the instrument is shorted, and if a scaling
low limit value is indicated, the instrument is likely to be operating
normally, however, the signal wire may be disconnected.
• Check whether the input terminals of thermocouple, RTD or DC voltage
(0 to 1V DC) are securely mounted to the instrument input terminals.
Connect the sensor terminal to the instrument input terminal securely.
• Check whether the input signal source of DC voltage (1 to 5V DC)
or DC current (4 to 20mA DC) is disconnected.
How to check whether the input signal wire is disconnected
[DC voltage (1 to 5V DC)]
If the input to the input terminal of the instrument is 1V DC and if
a scaling low limit value is indicated, the instrument is likely to be
operating normally, however, the signal wire may be disconnected.
[DC current (4 to 20mA DC)]
If the input to the input terminal of the instrument is 4mA DC and
if a scaling low limit value is indicated, the instrument is likely to be
operating normally, however, the signal wire may be disconnected.
• Check if the input signal wire of DC voltage (1 to 5V DC), DC current
(4 to 20mA DC) is securely connected to the instrument input terminals.
Connect the signal lead wire to the instrument input terminal securely .
Presumed cause and solution
key for approx. 1 second to release the function.
of resistance is connected to the input terminals
(32 ) is indicated, the instrument is likely to be
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