GRAPHTEC MT100 - Connection Diagram; Internal Equivalent Circuit of the Analog Input Circuit

2-10
Checks and Preparation
b
＋
＋
−
−
Compensationcopperwire
(3) Place the terminal cover back on.
Connection Diagram
voltage input Thermocouple input
Resistance temperature detector input current input
Internal Equivalent Circuit of the Analog Input Circuit
+ ......................................... 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.
b
＋
＋
−
−
Direstvoltage
b
b
A
B
＋
−
Leadwireresistanceshouldbe10Ωorbelow
perwire,andequivalentamongthethreewires
.
b
＋
＋
−
−
Directcurrent
Shuntresistance
Ex:forcurrentinthe4to20mArange,
applyaresistanceof250Ω(±0.1%)an
d
performmeasurementinthe1to5V
range.
50Ω
50Ω
500kΩ
500kΩ
0.05μF
0.05μF
＋
−
ChannelSwitchingRelay
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
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.