Technical data
28 8LS...-3 user's manual V2.50
2.8.4 Holding brake (ff) 8LSA / 8LSC
Operating principle
The holding brake is a permanent magnet brake and can be controlled by the B&R drive system. Based on principle,
this type of holding brake exhibits a minimal amount of backlash.
The brake is designed as a holding brake. It not permitted to be used for operational braking! Under these condi-
tions, the brake has a service life of approximately 5,000,000 cycles (opening and closing the brake is one cycle).
Loaded braking during an emergency stop is permitted but reduces its service life.
Information:
The required brake holding torque is determined based on the actual load torque. If not enough infor-
mation is known about the load torque, it is recommended to assume a safety factor of 2.
Warning!
The holding brake is not intended for normal braking. The holding brake does not provide protection
for personnel. The maximum motor torque far exceeds the holding torque for the brake.
Motor options (ff) - Overview (order code)
see "Motor options (ff) 8LSA / 8LSC" on page 24
Note:
In addition to the standard holding brake and the reinforced holding brake, there is also a special
holding brake for special option "reinforced A-side bearing".
see "Special motor options (gg) 8LSA / 8LSC" on page 34
see "Special-purpose holding brake for reinforced A-side bearing" on page 35
2.8.4.1 Standard holding brake (ff) 8LSA / 8LSC
The 8LSA and 8LSC three-phase synchronous motors can be supplied with a standard
holding brake. It is installed directly behind the A flange on the motor and is used to hold
the motor shaft when no power is applied to the servo motor.
Technical data - Standard holding brake
8LSA2
8LSC2
8LSA3
8LSC3
8LSA4
8LSC4
8LSA5
8LSC5
8LSA6
8LSC6
8LSA7
8LSC7
8LSA8
8LSC8
Holding torque M
Br
[Nm] 2.2 4 8 15 32 47 130
Connected load P
On
[W] 8.2 13.4 18.0 24.0 26.0 20.4 50.0
Supply current I
On
[A] 0.35 0.56 0.75 1.0 1.08 0.85 2.08
Supply voltage U
On
[VDC] 24 (+10% / -10%) 24 (+6% / -10%)
Moment of inertia J
Br
[kgcm²] 0.12 0.38 0.54 1.66 5.85 32 53.0
Weight m
Br
[kg] 0.19 0.29 0.46 0.9 1.6 3.8 5.35
2.8.4.2 Reinforced holding brake (ff) 8LSA / 8LSC
8LSA and 8LSC three-phase synchronous motors in sizes 3 - 7 that have normal A-side
bearings can be delivered with a reinforced holding brake.
Combining a "reinforced A-side bearing" with a reinforced holding brake is not possible!
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