IAI RCM-P6AC, Instruction Manual, Page: 187 / 286

6. Power-saving Function
Fieldbus Communication
175
RCP6S
Chapter 6 Power-saving Function
6.1 Automatic Servo-off and Full Servo Functions
This controller possesses Automatic Servo OFF (setting available on all model) and Full Servo
functions (for RCP6S and RCM-P6PC only) 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
(Note 1)
, it is able to reduce the power consumption (Note) by
controlling the pulse motor which consumes comparatively high current during a stop.
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.
Note 1 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.)
Condition Setting
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.
ME0349-4B