Frenic 5000VG7S Series, Instruction Manual

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2-15
(2) Digital input terminals (FWD, REV, X1-X9, PLC, and CM)
1) The digital input terminals such as FWD, REV, and X1-
X9 are generally turned on/off between the CM terminal.
If turned on/off using an external power source and open
collector outputs from the programmable logic controller,
the terminals may malfunction due to current leak from
the external power source. In this case, connect the
external power source using the PLC terminal as shown
in Figure 2-3-12.
2) When inputs are made through relay contacts, use a
highly reliable relay contacts (Fuji Electric's HH54PW
control relays, for example).
(3) Transistor output terminals (Y1-Y4 and CME)
1) A circuit configuration as shown in the 'Transistor Output
Terminals' column of Table 2-3-4 is used. Take care not
to connect external power leads with reversed polarity.
2) When control relays are used, connect a surge
suppression diode to each end of the exciting coil.
(4) Miscellaneous
1) The control terminal leads should be kept as apart from the main circuit leads as possible to prevent
malfunction due to noise.
2) The control leads inside the inverter should be secured to prevent direct contact with the live part of the
main circuit (the main circuit terminal blocks, for example).
·
The shield of each control cable does not serve as a reinforced insulator. If the shield is broken for some
reason, a high voltage in the main circuit may invade the control signal circuit. The Low Voltage
Directive in Europe also prohibits the users to wire the inverter with a main circuit lead in contact with a
control lead.
Doing so may lead to electric shock.
·
Noise may be generated from the inverter, motor, and leads.
·
Protect sensors and devices around the inverter from malfunction.
Failure to do so may lead to accident.
(5) Wiring of Control Circuits
1) FRN18.5VG7S-2 to FRN55VG7S-2
FRN18.5VG7S-4 to FRN110VG7S-4
(a) Pull the wiring out along the left side panel of the inverter as shown in Figure 2-3-13.
(b) Tie leads with bands (Insulock, for example) and secure to the hole (tie mounting hole A) on the left
side wall of the main circuit terminal block on the way outward. The bands should be 3.5mm or less in
width and 1.5 mm or less in thickness as they are to be passed through the holes (4mm dia.).
(c) If an optional printed circuit board is mounted, secure signal leads to the tie mounting hole B.
Figure 2-3-12
Protection against Current Leak
from External Power Source