Manual

46 3-phase stepper motor
3 Technical Data BRS3
0198441113730, V2.02, 03.2011
3.10 Options
3.10.1 Holding brake
Function The holding brake in the motor has the task of holding the current motor
position when the power stage is disabled, even if external forces act (for
example, in the case of a vertical axis). The holding brake is not a safety
function.
For a description of the controller, see chapter 4.4.3 "Holding brake con-
nection".
Technical data The signals of the holding brake meet the PELV requirements.
Table 3.1 Technical data holding brake
Holding brake controller When the holding brake heats up to 80°C, the holding torque can de-
crease to 50% of the nominal torque. In the case of excessive heat, it is
recommended to use a holding brake controller with voltage reduction.
This allows for a voltage reduction of up to 50% after approx. 100 ms. If
a holding brake controller is used, the holding brake must be connected
using a shielded cable.
@ WARNING
LOAD FALLS DURING SWITCHING ON
When the holding brake of stepper motor drives is released and ex-
ternal forces are applied (vertical axes), the load may fall if the friction
is low.
• In such applications, limit the load to a maximum of 25% of the
static holding torque.
Failure to follow these instructions can result in death, serious
injury or equipment damage.
Holding brake for motor type BRS •• •• 36 •• 39 •• 3A
Nominal voltage [V] 24± 10% 24± 10% 24± 10%
Holding torque [Nm] 1 6 16
Electrical pull-in power [W] 8 22 28
Moment of inertia [kgcm²] 0.015 0.23 0.65
Permissible energy per deceleration Q
1)
[J] 6 * 10
6
8 * 10
6
13 * 10
6
Holding brake release time [ms] 60 30 50
Holding brake application time [ms] 14 18 20
Radial backlash [Degrees] 0.6 0.6 0.6
Mass approx. [kg] 0.5 1.5 3
1) The values apply to 1 ... 10 decelerations per hour.