2-8
(1) Analog input terminals (13, 12, C1, 11)
a. Because weak analog signals are handled, these signals are especially susceptible to the
external noise effects. Route the wiring as short as possible (within 20 m) and use shielded
cables. In principle, ground the shield of the shielded cable; if effects of external inductive
noises are considerable, connection to terminal 11 may be effective.
b. Use twin contacts relay for weak signals if relay is used in the circuit. Do not add a contact to
terminal 11.
c. When the inverter is connected with an external device outputting the analog signal, a
malfunction may be caused by electric noise generated by the inverter according to some
type of the circuit of the device. If this happens, connect a ferrite core or capacitor to the
device outputting the analog signal.
(2) Digital input terminals (FWD, REV, X1 through X5, P24)
a. Generally the digital input terminals (FWD, REV, X1-5) are turned on or off in relation to the
P24 terminal.
b. To use contact input, use a reliable contact free from poor contact.
Example: Control relay made by Fuji Electric: HH54PW
(3) Transistor output terminals (Y1E-Y2E, CMC)
a. Circuit configuration shown in Table 2-3-2 for transistor output is adopted. Take care of the
polarity of the external power supply.
b. To connect a control relay, connect a surge absorbing diode across the coil of the relay.
(4) Others
a. Route the wiring of the control terminals as far from the wiring of the main circuit as
possible. Otherwise electric noise may cause malfunctions.
b. Fix the control cables inside the inverter to keep them away from the live parts of the main
circuit (such as the terminal block of the main circuit).
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WARNING
If the control cables touch the live part of the main circuit, the insulation sheath of the
control cable, insulation of which is not reinforced, may be broken to cause a high
voltage of the main circuit to be fed to the control signal. This is banned in the low
voltage directive models for Europe.
Electric shock could occur.
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CAUTION
Electric noise may be generated by the inverter, motor or wiring. Take care of
malfunctions of the nearby sensors and devices.
An accident could occur.
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