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4.4 Common Precautions on Terminals for Control
Circuit
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Precautions on wiring
· For wiring of terminals for control circuit, strip specified length of insulation coating
before connecting.
· Loosen terminal screws and insert wires from bottom of the terminal block, and
tighten screws to specified tightening torque.
· Any loose connection could cause wire to come off and lead to malfunction. Also,
over-tightening could cause short-circuit due to broken of screws or the unit, thus
leading to malfunction.
· Use shielded cables for all control signal lines and separate them from power lines or
high-voltage circuits (20cm or more).
· Wiring length of control signal lines should be within 30m.
· Since input signals of control circuit are feeble, use dedicated contact for feeble
signals to avoid poor contact during contact input.
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Wire size and tightening torque for control circuit terminal
Terminal
symbol
Screw
size
Tightening orque
N·m
Wire size
Stripped
length of
cable sheath
A，B，C
1
to
AR
M3 0.3 to 0.4
0.25mm
2
to 0.75mm
2
(AWG24 to AWG18)
6mm
· Screwdriver ：Small-size ○－ screwdriver · Stripped length of wir e sheath
(Thickness of the edge: 0.4mm/ Width of the edge: 2.5mm)
· Terminal block for main curcuit ：
Terminal block for control circuit (Relay output/Signal input/output) ：The maximam
number of the conductors ： 2 *1
*1 The maximam number of the conductors should be made in the reach of the
suitable electric wire size.
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Precautions on wiring
Observe the following items to prevent wire breakage.
· Do not damage the core wire when tearing the insulation layer off.
· Connect the core wire together.
· Do not lift up the welded part of core wire. It may be broken by vibration.
· Do not apply force to cables after wiring.
· If the tightening direction of calbe in terminal block is CCW, it is wrong.
Remove the cable, and confirm the terminals before reconnect it.
CW CCW※Insert the calbe here.
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