GRAPHTEC GL450 - Connecting the Signal Input Cables to the Input Terminal Unit

Checks and Preparation
2-13
2.11 Connecting the Signal Input Cables to the Input Terminal Unit
This section describes how to connect the signal input cables to the input terminal unit.
Input Terminal Unit Types
There are three types of input terminal unit:
• 10-channel input terminal unit (mounted in the GL450) : 10TU
• 20-channel input terminal unit (mounted in the GL450) : 20TU
• 50-channel input terminal unit (used outside the GL450) : 50TU
Note: Each of these input terminal units has been designed for use with the GL450 model only.
CHECKPOINT
These input terminal units are for use with the GL450 model only. Moreover, input terminal units
designed for other models cannot be used with the GL450.
Terminal Configuration and Signal Types
Terminal layout on the top part of the unit
Terminal 1 Terminal 2
CH6 CH7 CH8 CH9 CH10
CH1 CH2 CH3 CH4 CH5
CH6 CH7 CH8 CH9 CH10
CH1 CH2 CH3 CH4 CH5
+
– b
Terminal configuration
+
–
Voltage
++
––
Thermocouple
+
– b
Resistance
temperature
detector (RTD)
Current
measurement
Signal source
For current in the 4 to 20 mA range,
apply a resistance of 250 Ω and
perform measurement in the 1-5V
range.
+ ......................................... High-voltage terminal (terminal for high-voltage input signals)
–.......................................... Low-voltage terminal (terminal for low-voltage input signals)
b.......................................... Terminal used for RTDs only
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
Sampling interval*
1
100, 200, 500 ms; 1, 2, 5, 10, 20, 30 s; 1, 2, 5, 10, 20, 30 min; 1 h
A/D resolution 16-bit
Filter On, Off (software filter)
*1 The maximum sampling interval will depend on the number of channels being used.