Toshiba Tosvert VF-AS1 - Manual (Page 197)

E6581301
G-3
7
3) Connection with transistor output
+ The inverter can be controlled by connecting
the input terminal with output (contactless
switch) of a programmable controller. Use this
function to specify forward/reverse run or a
preset speed operation. Use a transistor that
operates on 24Vdc, 5mA power.
CC
Input terminal
Inverter Programmable controller
* Interface between programmable controller and inverter
When using an open-collector output type programmable control device to control the operation of a motor, connect
cables, as shown in the schematic diagram for sink/source logic (when an external power supply is used) on page
B-13. When using the internal power supply of the inverter, connect cables, as shown in the schematic diagram on
page B-12. If the programmable control device is turned off with the inverter left on, an incorrect signal will flow into
the inverter, as shown in the figure below, because there is a potential difference between the control power
supplies.Be sure to provide an interlock so that the programmable controller cannot be turned off when the inverter
is on.
External +24V
power supply
P24
COM
Fuse
Fuse blowout
detector circuit
Inverter internal
+24V power
supply
+24V
Programmable controller Inverter
Input terminal
(F, R, ST….)
■ Example of use- three-wire operation
The three-wire operation function allows you to make the inverter self-hold its operation, without setting up a
sequential circuit, so that the inverter can be operated by means of external signals (reset contact signals).
F
CC
S3
Revers run
HD
Forward run (F): If you press the Forward (F) button, the
motor rotates in the forward direction at the
frequency specified with a command.
Revers run (R): If you press the Reverse (R) button, the
motor rotates in the reverse direction at the
frequency specified with a command.
HD (S3): If you press the HD (S3) button, the motor
decelerates and comes to a stop.
R
Forward run
[Parameter setting]
Terminal
symbol
Title Function Adjustment range Example of setting
S3 H
Input terminal function
selection 7(S3) ( HD operation retention)