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4. Measurement input terminals wiring
1) Measurement input terminal
Turn OFF the feed power source before
wiring to prevent an electric shock.
Install crimping terminals with insulation
sleeves to input terminals for wiring.
2) DC voltage (current) input wiring
Use instrumentation twisted cables for
measures against noise as input cables.
For current input, connect the shunt resistor
for current input to the channel to be
measured before wiring.
3) Thermocouple (TC) input wiring
Make sure to wire thermocouple cable (or
compensation lead wire) to input terminals of
the unit.
If a copper conductive wire is connected
halfway, big measurement error will be
generated.
In addition, avoid parallel connection of a pair
of thermocouple wires with other instruments
(controller or others) that cause troubles.
4) Resistance thermometer (RTD) input wiring
To prevent measurement errors, use 3-core
cables as the input cable in which lines have
the same resistance.
In addition, one resistance thermometer
cannot be connected in parallel with other
instruments (a controller or others).
mark on measurement input terminals
High voltage may be applied to the measurement input terminals due to common mode
noise. Allowable noise value is 30VAC or 60VDC or less. Check that the voltage is equal
to or less than the allowable value. Do not use the instrument for measurements on
mains circuits. Install terminal covers after wiring to prevent an electric shock and
protect input cables. For thermocouple input, installing terminal covers reduces
reference junction compensation errors.
!
!
Warning
Instrumentation
twisted cable
DC voltage input
(+)
(-)
1 2 3 4
DC voltage (current) input
!
Thermocouple (TC) input
!
Compensation leas wire
Red (+)
White (-)
1 2 3 4
Thermocouple
Resistance thermometer (RTD) input
!
3-core cable (Same line
diameter, same length)
Note: Cable resistance per 1 cable is 10
Ω
or less.
3 lines have the same resistance.
1 2 3 4
Resistance thermometer
A
B
B
Allowable input voltage
Input type
Allowable input voltage
Voltage, thermocouple input
±10VDC *
Resistance thermometer input
±6VDC
*±60VDC for channels specified with ±10V range or more
Rated including maximum transient overvoltage: ±60VDC
Caution
!