IAI MSCON, Instruction Manual

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Chapter 5 Power Saving Function (Automatic Servo-off Function)
239
Chapter 5 Power Saving Function
(Automatic Servo-off Function)
The product possesses an automatic servo-off function to reduce the power consumption while
the actuators are stopped. Read the description in this chapter carefully to save power so that
the controller can be operated safely.
The servo is automatically turned OFF after a certain period from completion of positioning. 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.
Three periods from completion of positioning to servo OFF can be set as parameters. The
period used for the automatic servo OFF is specified in the position table.
This function can be set for each axis number (actuator).
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: This function is ineffective for pressing. 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.
(1) Setting of periods taken until automatic servo OFF
Three periods from completion of positioning to automatic servo OFF can be set in the
following parameters in seconds [sec].
Parameter No. Description
36 Auto Servo Motor OFF Delay Time 1 (Unit: sec)
37 Auto Servo Motor OFF Delay Time 2 (Unit: sec)
38 Auto Servo Motor OFF Delay Time 3 (Unit: sec)
(2) Set of power-saving mode
Select a proper power-saving mode from the conditions below. Set the corresponding value
in the stop mode of the position table.
[Refer to 14) Stop mode in 3.3 Set of Position Table.]
Set Value Operation after completion of positioning Parameter No.
0 Servo ON not changed –
1 Automatic servo OFF after certain period 36
2 Automatic servo OFF after certain period 37
3 Automatic servo OFF after certain period 38
ME0306-2A