Chapter 3 Characteristics
3–4
3-2-2 Magnetic brake characteristics
HS-RF Series HA-SF Series
Item
43B
73B
53B 52B
103B 102B
202B
Type (Note 1) Spring braking type safety brakes
Rated voltage 24VDC
Rated current at 20°C (A)
0.41 0.8 0.8
Excitation coil resistance at 20°C (Ω)
58 30 30
Capacity (W) 9.9 19.2 19.2
Attraction current (A) 0.20 0.25 0.25
Dropping current (A) 0.12 0.085 0.08
Static friction torque (N·m) 2.4 6.8 8.5
Moment of inertia (Note 2) J (×10
–4
kg·m
2
) 0.26 0.35 2.0
Release delay time (sec) (Note 3) 0.03 0.03 0.03
Per braking 64 400 400
Tolerable braking work amount
(J)
Per hour 640 4000 4000
Brake play at motor axis (deg.) 0.1 to 0.9 0.2 to 0.6 0.2 to 0.6
Brake life (Note 4)
20,000 times with 32 (J)
braking amount
per braking
20,000 times with 200 (J)
braking amount
per braking
20,000 times with 200 (J)
braking amount
per braking
Notes:
1. There is no manual release mechanism. Refer to section "6-4-2 Manually releasing the magnetic brakes".
2. These are the values added to the servomotor without brakes.
3. This is the value for 20°C at the initial attraction gap.
4. The brake gap will widen through brake lining wear caused by braking. However, the gap cannot be
adjusted. Thus, the brake life is reached when adjustments are required.
5. A leakage flux will be generated at the shaft end of the servomotor with magnetic brakes.
6. When operating in low speed regions, the sound of loose brake lining may be heard. However, this is not a
problem in terms of function.
7. The brake characteristics for the HS-RF Series and HS-SF202 are the planned values.
3-2-3 Magnetic brake power supply
(1) Brake excitation power supply
1) Prepare a brake excitation power supply that can accurately ensure the attraction current in
consideration of the voltage fluctuation and excitation coil temperature.
2) The brake terminal polarity is random. Make sure not to mistake the terminals with other
circuits.
(2) Brake excitation circuit
<Cautions>
• Provide sufficient DC cut off capacity at the contact.
• Always use a serge absorber.
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