Panasonic AFPE224300 User Manual page 21

- Thermocouple input specifications
Item
Number of input
Temperature sensor type
Input range
Accuracy
Resolution
Conversion time
Insulation method
Detection function of wire
disconnection
*1)Temperature can be measured up to 330 ºC (626 ºF). When the measured temperature exceeds 330
ºC (626 ºF) or the thermocouple wiring is disconnected, "K20000" is written to the register.
*2)Temperature conversion for thermocouple input is performed every 250 ms. The conversion data is
updated on the internal data register after the scan is completed.
*3)The internal circuit and thermocouple input circuit are not insulated. Therefore, use the nongrounding
type thermocouples and sheath tubes.
Note:
- To prevent the influence of noise, use the shielded thermocouples and compensating lead wires
after grounding them. When the shielding types are not used, thermocouples and compensating
lead wires should be used less than 10 m.
- When the wire of the thermocouple is extended, be sure to use compensating lead wires
according to the thermocouple type.
- It takes about 2 seconds until the input processing is completed after the power is supplied.
Therefore, the input data is necessary to be valid after the temperature input completion flags X4E
(CH0) and X4F (CH1) turn ON.
After that, the temperature input completion flags turn on for only one scan at every time that the
temperature conversion process has been completed (every 250ms approx).
- 1 to 50 times (Average) can be set using the system register 409. The initial setting is "0." (Average:
20 times)
Set the value to 20 or more to prevent the fluctuation of the thermocouple input value.
- For accurate temperature measurement, we recommend to warm up the unit for 30 minutes after the
power is supplied.
- Connecting/disconnecting the thermocouple input terminal block while the thermocouple unit is ON
will lower accuracy temporarily. In that case, it is recommended to warm up the unit for at least 15
minutes.
- A rapid temperature change in the thermocouple unit might change the temperature data temporarily.
- Prevent a direct air (wind) from the cooling fan built in the control panel etc. The direct air (wind) to the
thermocouple unit will lower accuracy.
Example of Input temperature and internal data processing
Input temperature
- 30.0 ºC (- 22.0 ºF)
25.0 ºC ( 77.0 ºF)
200.0 ºC (392.0 ºF)
To display the temperature in the Fahrenheit scale (ºF), turn Y37 contact ON.
F = C x 9/5 + 32
F: Fahrenheit, C: Celsius, 0 ºC = 32 ºF, 100 ºC = 212 ºF
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
Specifications
2 points (CH0: WX1, CH1: WX2)
Thermocouple type K
*1)
(
- 30.0 to 300.0 ºC - 22 to 572 ºF)
±0.5%FS±1.5 ºC (FS = -30 to 300 ºC)
0.1 ºC
*2)
250 ms/2CH
Between internal circuit and thermocouple input
*3)
circuit: noninsulated
Between CH0 and CH1 of thermocouple input:
PhotoMos insulation
Available
Internal data (WX1 and WX2)
K-300 (K-220)
K 250 (K 770)
K2000 (K3920)
2-7