Panasonic VF0 Series Instruction Manual page 22

♦ By using terminals No. 8 and 9, the output frequency can be controlled with
■ Precautions
1. Use shielded wires for all control signal wires and keep them more than 20
2. Maximum control signal wire length is 30m or less.
3. The control circuit's input signal is a minute signal, so use two minute
4. No-voltage contact signal or open-collector outputs signal should be used
5. When an inductive load is to be driven by an open-collector output, be sure
Inverter internal circuit
21
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the PWM signal.
· No. 8: Frequency setting signal changeover input terminal (SW2)
(OFF: PWM signal, ON: controlled with signal set in parameter
P09)
· No. 9: PWM signal input terminal
3 8 9
PWM
signal
SW2
cm from power wiring.
signal contacts in parallel or use a twin contact to prevent contact faults
when inputting the contact.
with control terminals No. 5 to 9.
(If a voltage signal is applied across these terminals, the internal electronics
may be damaged.)
∗ Input circuit specifications are shown below. Take special care to avoid
loop or leakage current.
to use a freewheel diode.
2kΩ
Terminals
12VDC
No.5 to 9
Terminal
No.3
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Note 1) When controlling the output frequency with the PWM
signal, parameters P22, P23 and P24 must be set.
Note 2) Use a PWM signal transistor (Tr) that has the following
capabilities:
· Maximum rated voltage : 50VDC or more
· Rated current
Freewheel diode
Inverter
internal circuit
Terminal
No.10
Terminal
No.11
: 50mA or more
X
+
e.g.24VDC
power source