Table of Contents
Advertisement
5
CHARACTERISTICS
5.1
Overload protection characteristics
Outline
An electronic thermal is built in the drive unit to protect the servo motor, drive unit and servo motor power wires from
overloads. In this section, overload protection characteristics refer to the overload protection characteristics of drive units and
servo motors.
[AL. 050 Overload 1] occurs if overload operation performed is above the electronic thermal protection curve shown below.
[AL. 051 Overload 2] occurs if the maximum current is applied continuously for several seconds due to machine collision, etc.
Use the equipment within the overload protection level indicated on the left side of the continuous or dotted lines in the
following graphs.
For machines where unbalanced torque occurs, such as a vertical axis system, the unbalanced torque should be kept at 70 %
or lower of the rated torque.
This drive unit has a servo motor overload protection function. (The servo motor overload current is set on the basis of 115 %
rated current (full load current) of the drive unit.)
The drive unit may malfunction regardless of the electronic thermal protection if torque exceeding 100 % of the rated torque is
generated too frequently while the servo motor is stopped (servo-lock status) or being operated at low speeds of 50 r/min or
less.
Graph of overload protection characteristics
The following table lists servo motors and corresponding graphs of overload protection characteristics. The overload
protection characteristics depend on the servo motor.
Rotary servo motor
HK-KT
053W
13W
1M3W
434W
634W
7M34W
1034W
634UW
1034UW
1534W
2034W
2024W
5 CHARACTERISTICS
92
5.1 Overload protection characteristics
HK-ST
524W
1024W
1724W
3024W
2024W
3524W
2024AW
3534W
5024W
7024W
5034W
HK-RT
1034W
1534W
2034W
3534W
5034W
7034W
Graph of overload protection
characteristics
Page 93 Characteristic a
Page 93 Characteristic b
Page 93 Characteristic c
Advertisement
Table of Contents
