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4.5.2 Motor-less operation in controller
POINT
Use motor-less operation which is available by making the servo system
controller parameter setting.
Connect the servo system controller to the servo amplifier before the motor-less
operation.
The motor-less operation using a controller is available with rotary servo motors
only. It will be available with linear servo motors and direct drive motors in the
future.
(1) Motor-less operation
Without connecting the servo motor to the servo amplifier, output signals or status displays can be
provided in response to the servo system controller commands as if the servo motor is actually running.
This operation may be used to check the servo system controller sequence. Use this operation with the
forced stop reset. Use this operation with the servo amplifier connected to the servo system controller.
To stop the motor-less operation, set the motor-less operation selection to "Disable" in the servo
parameter setting of the servo system controller. When the power supply is turned on next time, motor-
less operation will be disabled.
(a) Load conditions
Load item Condition
Load torque 0
Load to motor inertia ratio Same as the moment of inertia of the servo motor
(b) Alarms
The following alarms and warning do not occur. However, the other alarms and warnings occur as
when the servo motor is connected.
Alarm and warning
Rotary servo
motor
Linear servo motor Direct drive motor
(Note) Rotary servo
motor in fully closed
loop system
[AL. 16 Encoder initial communication error 1]
[AL. 1E Encoder initial communication error 2]
[AL. 1F Encoder initial communication error 3]
[AL. 20 Encoder normal communication error 1]
[AL. 21 Encoder normal communication error 2]
[AL. 25 Absolute position erased]
[AL. 28 Linear encoder error 2]
[AL. 2A Linear encoder error 1]
[AL. 2B Encoder counter error]
[AL. 92 Battery cable disconnection warning]
[AL. 9F Battery warning]
[AL. 70 Load-side encoder error 1]
[AL. 71 Load-side encoder error 2]
Note. The fully closed loop system is available for the MR-J4-_B_(-RJ) servo amplifiers of which software version is A3 or above. Check
the software version using MR Configurator2.