IAI PCON-CB series, Instruction Manual

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Chapter 6 Power-saving Function
POWER CON
PCON-CB/LC
163
Chapter 6 Power-saving Function
6.1 Automatic Servo-off and Full Servo Functions
This controller possesses Automatic Servo-off and Full Servo functions to reduce the power
consumption while the actuator is stopped. Read the description in this chapter carefully to
save power so that the controller can be operated safely.
Automatic Servo-off function automatically turns the servo OFF in certain time after positioning
process is finished. The next positioning command is issued to turn the servo ON automatically
and achieve the positioning. No holding current flows in the stop state to allow the power
consumption to be saved.
3 types of patterns can be set for the time since positioning complete until servo turned OFF,
and either one can be selected.
In the Full Servo Function, it is able to reduce the power consumption by controlling the pulse
motor which consumes comparatively high current during a stop
(Note 1)
. (RCP6 is can not be
used full servo function)
For the power saving function, which of Parameter No.53 or “Stop Mode” in the position table is
to be used is determined by the actuator condition. The details are shown below.
Note1 Certain amount of stop current is applied to restrain small vibration during a stop to stop
completely. Also, return to the target position will not be performed for the misalignment
in the range of +/-2 counts from the target position for the encoder value.
(Return operation will be performed even for misalignment of 1 count when the full servo
feature is activated.)
RCP6 makes recovery operation even for one count of misalignment just like the full
servo control.
Setting
Status
PIO Pattern 0 to 4 PIO Pattern 5
Standby after home return
is complete
(Positioning to the target
point is not done)
Power saving function executed
with the values set in Parameter
No.53 (Stop Mode of the
position number is invalid)
Standby with the servo
turned ON after the power
is supplied (Positioning to
the target point is not
done)
Power saving function executed
with the values set in Parameter
No.53 (Stop Mode of the
position number is invalid)
Standby after the
positioning is complete to
the target position set in
the position table
Power saving function executed with the values set in “Stop
Mode” in each position number (Setting of Parameter No.53 is
invalid)
Warning: Do not use this function if the automatic servo-off is followed by pitch feed (relative
movement).
Servo ON/OFF may cause slight position shift to occur. If position shift occurs due to
external force during servo-off, positioning to the correct position is disabled. It is
because pitch feed is operated based on the position at start used as the base point.
Caution: Automatic servo-off function is not effective while in pressing operation.
Do not use. It becomes effective at completion of positioning. In pressing, the function
becomes effective only when miss-pressing occurs (the status at the completion of
operation without pressing is the same as that at the completion of positioning).
No retaining torque is provided in automatic servo-off. The actuator can move with an
external force. Pay attention to the interference to the peripherals and the safety in
the installation.
Caution: When an operation is made with jog or inching while in operation with the full servo
function, the full servo function will be inactivated. If a movement is made again on the
position number that the full servo function is set valid, the full servo function will be
activated.