7 Operation
−43−
Setting by external DC voltage
External DC voltage is used when the speed is set by D/A output from an external
control device such as a programmable controller, or when the speed is switched
over two levels during operation in combination with the internal speed
potentiometer.
For external DC voltage, use DC power supply (0 to 5 VDC, 1 mA or more) where
the primary and secondary sides are provided with reinforced insulation.
012345
500
1000
1500
2000
2500
3000
3500
Speed
∗
[r/min]
DC voltage [V]
External DC voltage
-
speed characteristics
(typical value)
External
DC power supply
0 to 5 VDC
1 mA or more
+
-
5
4
VRM Green
VRL Yellow
I/O signals
connector (CN2)
∗ Indicates the speed of the motor alone. The speed of the gear output shaft of a geared type or
combination type is obtained by dividing the motor speed by the gear ratio.
To drive the motor set at the external DC voltage, turn off the INT.VR/EXT input.
• To set the running speed only by the external speed setter, there is no problem if
the INT.VR/EXT input is not connected.
• To perform operation by switching the motor running speed, use the INT.VR/EXT
to switch the external DC voltage and internal potentiometer.
Note
• The external DC power supply voltage must not exceed 5 VDC. Otherwise,
the driver may be damaged.
• When connecting the external DC power supply, sufficient care must be
taken not to mistake power polarity. Connection with incorrect polarity may
damage the driver.
• To use a shielded cable for connection with the external DC power supply,
connection should be made close to the I/O signals cable connector.
Connect the shielded wire to the pin No.3 GND.
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