Lenze MDFQA 100 User Manual

Technical data
Holding brake (option)
3
 21
BA33.0001 E N 2.0
3.4 Holding brake (option)
The MDXKX, MCA and MCS servo motors can be equipped with permanent magnet
holding brakes (option). The enclosed-ventilated MDFQA asynchronous s ervo motors and
the MDXMA three-phase AC motors can be equipped with a spring-operated brake. The
installation or mounting of the brakes increases the length of the motor.
The brakes used are not fail-safe brakes in the sense that a torque reduction cannot occur
through uncontrollable interference factors, such as through the entrance of oil.
With long motor supply cables, the ohmic voltage drop along the cable must be observed
and compensated for by a higher voltage at the cable entry.
The following applies to Lenze system cables:
U
*
[
V
]
=
U
[
V
]
+
(
0
0
8

V

⋅
L
[
m
]
⋅
I
[
A
]
)
U* Resulting supply voltage
U
*
[
V
]
=
U
B
[
V
]
+
(
0
.
0
8

V
m ⋅ A

⋅
L
[
m
]
⋅
I
B
[
A
]
)
U
B
Rated voltage of the brake
L Length of cable
I
B
Rated current of the brake
 Stop!
If no suitable voltage (incorrect size, incorrect polarity) is applied to the brake,
the brake is applied and can overheat and be destroyed by the motor which
continues to run.
Theshortestoperatingtimes of the brakes are achievedby switchingthe voltageon theDC
sideand a suppressorcircuit (varistoror spark suppressor). Without suppressorcircuit,the
operating times may increase. A varistor/spark suppressor limits the breaking voltage
peaks. It must be observed that the power limit of the suppressor circuit is not exceeded.
It is dependent on the brake current, brake voltage, disengagement time and the
switchings per time unit.
Thesuppress or circuitis also required for radiointerference suppression and for increasing
the service life of the relay contacts ( external, not integrated in the motor).

Lenze MDFQA 100 Specifications

General

Brand	Lenze
Model	MDFQA 100
Category	Servo Drives
Language	English