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12
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5.2 Precautions while connections
Observe the following cautions during connections for securing safety and reliability.
1) Power supply
Use a single-phase power supply having a stable
voltage without any waveform distortion for the
purpose of preventing wrong operations.
2) Keep the input/output connections away
from a high voltage power circuit
Don’t place the input/output cables close or in
parallel with any strong power circuits including
power line. Place the cables 50 cm or more away
from high voltage power circuits when they are
placed close or in parallel to other circuits.
3) Keep the thermocouple input away from a
heat source
For thermocouple inputs, keep the input terminals
away from a heat source (a heating body) to reduce
a reference junction compensation error. Don’t
expose the input terminals to direct sunlight, etc.
4) Keep all connection cables away from
noises
Keep all connection cables away from noise source
as far as possible, otherwise unexpected
malfunction may occur. Provide a solution if the
cables cannot be separated from a noise source
due to unavoidable circumstances.
Major
noise
sources
Electromagnetic switch, etc.
Power line having waveform distortion
Inverter
Thyristor regulator
Counter
measures
Insert noise filters between power
terminals and input/output terminals.
A CR filter is often used.
5) Use crimp style terminals
(1) Fix crimp style terminals to termination of
connection cables for preventing the looseness
or disconnection of terminals and a short-circuit
failure between terminals.
(2) Use the crimp style terminals with insulation
sleeve for preventing an electric shock.
6) Unused terminals
Don’t use any unused terminals for relaying;
otherwise the electric circuits may be damaged.
Kinds of terminals and termination
Terminal name
Screw
diameter
Tightening
torque
Termination (Unit: mm)
Power and
protective
conductor and
communication
terminals
M4
1.2N • m
Terminals other
than described
above
M3.5
0.8N • m
*Use Type O whenever possible.
(1)
A switch and an overcurrent protective device
Prepare a switch and an overcurrent protective device
(3A) to the power supply for preventing an electric
shock accident during connection work. This recorder
is not provided with any replaceable fuse.
(2)
Turn off the power supply before connections.
Be sure to turn off the power supply before
connecting cables to the power and the input/output
terminals to prevent an electric shock.
Warning
Secure the connected cables properly.
Secure the connected cables so as not to allow them to be hooked by a person or a substance, otherwise the
connections may be cut and disrupted that may cause an electric shock or other accidents.
Warning
Type O
Less than 8.5
More than 4.3
t: 0.8
With an insulation sleeve
t: 0.8
With an insulation sleeve
Type O
t: 0.8
Type Y
Less than
8
More than 3.7
Less than
8
More than 3.7
