8 HK-RT SERIES
8.2 The graph of overload protection characteristics of rotary servo motor
193
8
8.2 The graph of overload protection characteristics
of rotary servo motor
Overload protection of rotary servo motors has been enhanced. Refer to "Overload protection characteristics" in the following
manual.
MR-J5 User's Manual (Hardware)
8.3 Characteristics of electromagnetic brake
Before operating the servo motor, confirm that the electromagnetic brake operates properly.
The operation time of the electromagnetic brake varies depending on the power supply circuit being used.
Check the operation delay time with an actual machine.
The characteristics of the electromagnetic brake provided for the rotary servo motor with an electromagnetic brake are shown
below.
*1 This type does not have a manual release mechanism. Use a 24 V DC power supply to release the brake electrically.
*2 The value for initial on gap at 20 °C.
*3 Brake lining wear due to braking will increase the brake gap, but the gap is not adjustable. Therefore, the brake life indicates the number
of times the brake can be applied before gap adjustment becomes necessary.
*4 Prepare a power supply exclusively for the electromagnetic brake.
*5 The values are design values. These are not the guaranteed values.
*6 Select the electromagnetic brake control relay properly, in consideration of the characteristics of the electromagnetic brake and surge
absorber. When a diode is used as a surge absorber, the electromagnetic braking time becomes longer.
*7 The value of the brake static friction torque is the lower limit in the initial state at 20 °C.
Item HK-RT103(4)WB
HK-RT153(4)WB
HK-RT203(4)WB
HK-RT353(4)WB
HK-RT503(4)WB
HK-RT702(4)WB
Type
*1
Spring actuated type safety brake
Rated voltage
*4
Power consumption at 20 °C [W] 13.8 23
Coil resistance
*5
[]42 25
Inductance
*5
[H] 0.15 0.25
Brake static friction torque
*7
[N•m] 9.5 or more 16 or more
Release delay time
*2
[s] 0.09 0.12
Braking delay time [s] DC off
*2
0.03 0.03
Permissible braking
work
Per braking [J] 64 400
Per hour [J] 640 4000
Brake looseness at servo motor shaft
*5
[degree] 0.9 0.01 to 0.6
Brake life
*3
Number of braking times
[times]
5000 5000
Work per braking [J] 64 400
Selection example of
surge absorbers to be
used
*6
For the suppressed
voltage 125 V
TND20V-680KB (Manufactured by NIPPON CHEMI-CON CORPORATION)
For the suppressed
voltage 350 V
TND10V-221KB (Manufactured by NIPPON CHEMI-CON CORPORATION)
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