GRAPHTEC GL820 - Connecting the Signal Input Cables; Terminal Configuration and Signal Types; Connection Diagram

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CHAPTER 2 Checks and Preparation
2.5 Connecting the Signal Input Cables
This section describes how to connect the signal input cables.
Terminal Configuration and Signal Types
＋
−
b
CH1 CH20
Connection diagram
DC voltage input Thermocouple input
Voltage input
Compensationcopper wire
Resistance temperature detector input Current input
Lead wire resistance should
be 10Ω or less per wire,
three wires need to be same length.
A
B
b
b
Shunt resister
Ex: The current is converted to the voltage in
the shunt register.
For 4 to 20mA current input, installing 250
ohms (0.1%) resister for converting 1 to 5V.
* 250 ohms shunt register is the option B551.
Direct current
+ ......................................High-voltage terminal (terminal for high-voltage input signals)
– ......................................Low-voltage terminal (terminal for low-voltage input signals)
b ......................................Dedicated terminal when connecting resistance temperature detector
* Resistance temperature detector input terminals A (+) and B (-) are isolated within each channel. Terminal b is shorted
within all channels.
Item Description
Input configuration Isolated input, scanning
Analog voltage 20, 50, 100, 200, 500 mV/F.S.; 1, 2, 5, 10, 20, 50 V/F.S.; 1-5V
Thermocouples K, J, E, T, R, S, B, N, W (WRe 5-26)
Resistance temperature detector PT100, JPT100, PT1000 (IEC751)
A/D resolution 16-bit (Effective resolution: About 1/40,000 of the +/- range)
Filter Off, 2, 5, 10, 20, 40
Filter operation is on a moving average basis.
The average value of the set sampling count is used.
If the sample interval exceeds 30 seconds, the average value of data ob-
tained in a sub-sample (30 seconds) is used.