— 9-1 —
9. Operational Function
9.1. General Operation and Function
9.1.1. Servo “ON”
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After the power to Driver Unit is turned on and its DRDY output circuit is closed, making SVON
input ON should make the Motor servo-on.
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The position error counter will be cleared when SVON input is OFF.
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When SVON input is ON, the “MO” command turns servo-off.
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The “SV” or “MS” command will cancel this “MO” command effect.
Figure 9-1
CPU initialise (2 sec approx.)
30ms max.
Invalid
Close
Open
ON
OFF
ON
OFF
Power supply
DRDY output
SVON input
Motor servo
RS-232C command
ON
OFF
SV or MS
MO
SV or MS
SV or MS
5ms max.
u
Precaution when turning ON/OFF the main power supply and the control power
supply separately:
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When turning on the main power supply with the control power supply turned on: Turn on the main
power supply first, then the SVON input.
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When turning off the main power supply with the control power supply turned on: Turn off the
SVON input first, then the main power supply.
* When the main power supply is turned off in the servo-on state, the Driver Unit outputs the AC Line
under-voltage alarm. (Once this alarm occurs, it will not recover unless the power is turned on
again.)
Figure 9-2
1sec or more
ON
OFF
ON
OFF
Control power
supply
Main power
supply
SVON input
ON
OFF
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