Characteristics; Overload Protection Characteristics - Mitsubishi MR-J4-10A Instruction Manual

16. USING A DIRECT DRIVE MOTOR
Timing chart at power on under the condition of performing magnetic pole detection
Power
SON (Servo-on)
ABSM (ABS transfer mode)
ABSR (ABS request)
ABST
(ABS transmission data ready)
ABSB0
(ABS transmission data bit 0)
ABSB1
(ABS transmission data bit 1)
Base circuit
RD (Ready)
Warning
Note 1. Refer to section 12.8.2 (1) (b) for details.
2. Performing the magnetic pole detection triggers [AL. 93 ABS data transfer warning].
For transferring absolute position data to the controller, refer to section 12.8.

16.5 Characteristics

16.5.1 Overload protection characteristics

An electronic thermal is built in the servo amplifier to protect the servo amplifier, the direct drive motor, and
direct drive motor power wires from overloads.
[AL. 50 Overload 1] occurs if overload operation performed is above the electronic thermal protection curve
shown in fig. 16.2. [AL. 51 Overload 2] occurs if the maximum current is applied continuously for several
seconds due to machine collision, etc. Use the equipment on the left-side area of the continuous or broken
line in the graph.
For the system where the unbalanced torque occurs, such as a vertical axis system, it is recommended that
the unbalanced torque of the machine be kept at 70% or less of the motor's rated torque.
This servo amplifier has solid-state direct drive motor overload protection for each axis. (The direct drive
motor overload current (full load current) is set on the basis of 120% rated current of the servo amplifier.)
ON
OFF
First servo-on after power on
ON
OFF
ON
During ABS transfer
OFF
(Note 1)
ON
OFF
(Note 1)
ON
OFF
(Note 1)
Absolute
position data
95 ms
ON
OFF
15 s or less
Magnetic pole detection time
ON
OFF
Existent
Non-existent
Operation
possible
(Note 2)
16 - 15
Second or later servo-on
During ABS transfer
(Note 1)
(Note 1)
(Note 1)
Absolute
position data
95 ms
Operation
possible