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2-15
(2) Digital input terminals (FWD, REV, X1 to X9 and CM)
① Digital input terminals (e.g., FWD, REV, X1 to X9)
are generally turned on or off by connecting or
disconnecting the line to or from the CM terminal. If
Digital input terminals are turned on or off by
switching the open collector output of PLC using an
external power supply, a resulting bypass circuit may
cause the inverter to malfunction.
To prevent a malfunction, connect the PLC terminal
as shown in Fig. 2-3-14.
② When using a contact input, a relay having highly
reliable contact must be used.
Example: Fuji Electric Control Relay:HH54PW
Fig. 2-3-14
Connection for External power supply
(3) Transistor output terminals (Y1 to Y4, CME)
① To connect a control relay, connect a surge absorbing diode to both ends of its exciting coil.
(4) Others
① To prevent a malfunction as a result of noise, control terminal cables must be placed as far as possible
from the main circuit cables.
② The control cables inside the inverter must be secured to prevent direct contact with live section (e.g.,
main-circuit terminal block) of the main circuit.
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WARNING
Control lines generally do not have enhanced insulation. If the insulation of a
control line is damaged, the control signals may be exposed to high voltage in the
main circuit. The Low Voltage Directive in Europe also restricts the exposure to
high voltage.
Electric shock may result
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CAUTION
The inverter, motor, and cables generate noise.
Check that the ambient sensors and devices do not malfunction.
Accident may result.
(5) Wiring of control circuit (inverter of 40HP or more)
① Pull out the control circuit wiring along the left panel as shown in Fig. 2-3-15.
② Secure the cable to cable binding hole A (on the left wall of the main circuit terminal block) using a cable-tie
(e.g., insulock). The cable-tie must not exceed 0.14inch (3.5mm) in width and 0.06inch (1.5mm) in
thickness.
③ When the optional PC board is mounted, the signal lines must be secured to cable binding hole B.
Fig. 2-3-15 The wiring route of the control circuit
Programmable
Logic controller
Fig. 2-3-16 The securing positions of the
control-circuit line of inverte
r
(40HP or more)