Panasonic VF0 Series 400V class Instruction Manual page 22

♦ By using terminals No. 8 and 9, the output frequency can be controlled with
the PWM signal.
· No. 8: Frequency setting signal changeover input terminal (SW2)
· No. 9: PWM signal input terminal
3
8
SW2
Precautions
1. Use shielded wires for all control signal wires and keep them more than 20
cm from power wiring.
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
signal contacts in parallel or use a twin contact to prevent contact faults
when inputting the contact.
4. No-voltage contact signal or open-collector outputs signal should be used
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.
5. When an inductive load is to be driven by an open-collector output, be sure
to use a freewheel diode.
Inverter internal circuit
12VDC
21
(OFF: PWM signal, ON: controlled with signal set in parameter
P09)
9
PWM
signal
2kΩ
Terminals
No.5 to 9
Terminal
No.3
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
Inverter
internal circuit
Terminal
No.10
Terminal
No.11
: 50mA or more
Freewheel diode
X
+
e.g.24VDC
power source