GRAPHTEC GL840 - 2.5 Connecting the Signal Input Cables

2-6
CHAPTER 2 Checks and Preparation
2.5 Connecting the Signal Input Cables
This section describes how to connect the signal input cables.
During wiring, conrm that the signal's supply source is turned OFF to prevent electrical shocks.
Also, position the GL840 input cable away from any power lines and ground cables.
Terminal Conguration and Signal Types (Standard terminal: B-564, Withstand high-voltage high-precision terminal: B-565)
Terminal assignment of standard terminal and Withstand high-voltage high-precision terminal is common.
CH1 CH20
+
-
b
Connection diagram (Standard terminal: B-564, Withstand high-voltage high-precision terminal: B-565)
+
-
A
B
b
+
-
b
+
-
+
-
DC voltage input Thermocouple input
Resistance bulb input DC current input
Voltage input
Compensation wire
The lead wire resistance per line should
be 10Ω or less, and the resistance values
of the three lines should be equal.
Shunt resister
Ex: For 4-20mA, add 250Ω (±0.1%) and measure in the 1-5V
range.
* Use B-551 (option) for the shunt resistor.
DC 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 bulb
* Resistance bulb input terminals A (+) and B (-) are isolated within each channel. Terminal b is shorted
within all channels.
Item Description
Input conguration Isolated input, scanning
Measurement range 20, 50, 100, 200, 500 mV/F.S.; 1, 2, 5, 10, 20, 50, 100 V; 1-5V/F.S.