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MKE Synchronous Servomotors
Features and functions
Bosch Rexroth AG
R911402016, Edition 02
Technical data holding brakes
Table 10: Holding brake data (optional)
Type
Holding
torque
Rated voltage
1)
Rated current Maximum
connection
time
Maximum dis-
connection
time
M
4
[Nm]
U
N
[V]
I
N
[A]
t
1
[ms]
t
2
[ms]
MKE037B-___-__1-____
1.00
24
0.40
3
4
MKE047B-___-__1-____
2.20
24
0.34
14
28
MKE098B-___-__1-____
11.00
24
0.71
13
30
MKE118B-___-__1-___
32.00
24
0.93
15
115
MKE118D-___-__3-___
70.00
24
1.29
53
97
1) Tolerance ± 10%
Energy saving function for holding brakes
Decrease brake voltage
The control voltage of the holding brake in MKE
holding brakes can be reduced after executing
the switching operation “Open brake” by using
suitable control modules (e.g.
IndraDrive brake
control module HAT02.1-003). By decreasing
the control voltage, energy can be saved of up to
50% and the self-heating of the motor can be
reduced.
To decrease the control voltage of MKE holding
brakes, the following conditions apply:
•
Maximum decrease of control voltage to U
N
≥17
V
DC at the motor.
•
Waiting time after releasing the holding brake
is at least 200 ms
•
Decreasing the control voltage by voltage
control or pulse width modulation with a
PWM cycle frequency ≥
4
kHz
Decreasing the controlled voltage or PWM
cycle frequency of the control voltage
≥
4
kHz
•
Ensure the functionality of the holding brake.
Remark:
Refer to the instructions in the con-
trol module documentation.
Refer to the notes for dimensioning of the cable
length and cable cross-section of brake cables.
Safety and personal protection
The permanent magnet brakes of the MKE motors
are not safety brakes, since a holding torque
reduction can occur due to uninfluenceable dis-
turbance factors. Especially for use in vertical
axes.
WARNING
Grievous bodily harm due to dangerous move-
ments from falling or dropping axes!
Secure vertical axes against dropping or sinking
after switching off by e.g.:
−
Mechanical locking of the vertical axis
−
External brake, arrestor, clamping device.
−
Weight compensation of the axes
The holding brake itself is not suitable for per-
sonal protection. Ensure protection of persons by
superordinate fail-safe measures, like block
danger zones via safety fences.
For European countries, additionally comply with
the following standards and guidelines, e.g.
