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EN 61000-4-11 Voltage dips, short interruptions, and short supply voltage variations:
a)
Voltage interruptions:
Brakes that comply with the requirements of DIN VDE 0580 are de-energised after the specified switching
times at the latest. The switching time depends on the control and mains conditions (e.g. generator effect
of running down motors). Voltage interruptions of shorter duration than the response delay specified by
DIN VDE 0580 will not cause any malfunctions. The user must ensure that any damage is avoided (e.g.
motor start-up before the brake has been released caused by phase failure in the case of two-phase
energised motors or by the slipping of an electromagnetically engaged system due to torque drop). The
functional reliability of the electromagnetic brake and its electronic accessories remains unaffected
provided that any damage is avoided.
b)
Voltage dips and short supply voltage variations:
Electromagnetically released systems:
Voltage dips and supply voltage variations to below 60% of the rated voltage and lasting longer than the
response delay specified by DIN VDE 0580 may cause the brake to be de-energised temporarily. Damage
as described under a) above must be avoided by the user by taking adequate precautions.
Electromagnetically engaged systems:
Voltage dips and supply voltage variations to below the minimum tolerance threshold will cause torque
reductions. The user is required to take adequate precautions to avoid consequential damage.
Radio interference suppression in accordance with EN 55011:
The brakes and the recommended electronic rectifiers are classified as Group 1 equipment in accordance with
EN 55011. As far as the emissions from this equipment are concerned, one distinguishes between field guided
radiated interference and line-conducted interference.
a)
Radiated interference:
When operated with DC voltage or rectified 50/60 Hz AC voltage, all brakes comply with the limit values
applicable to Class B equipment.
b)
Conducted interference:
When
connected
electromagnetic brakes meet the limit values applicable
to Class A equipment. If the brakes are connected to a
50/60 Hz AC power source and equipped with electronic
rectifiers or other electronic controls, interference
suppression measures as shown in Fig. 16/1 must be
taken to ensure compliance with the limit values
applicable
to
Class
suppression capacitors should be used which must be
dimensioned to suit the connection data of the
electromagnetic components and the specific mains
conditions. The recommended rectifiers specified in
Section 3.3 are CE mark certified in accordance with the
EMC
Directive.
suppression components and comply at least with the
requirements of EN 55011 for Class A equipment, unless
otherwise specified in the specification sheet. When
brakes are used with the specified rectifiers or with other types of rectifiers, the recommended values
listed in Table 17/2 should be observed. Interference suppression components should be installed as
close as possible to the consumer. Interference caused during switching operations of the electromagnetic
component is generally attributable to the inductive load. Where necessary, assemblies designed to limit
the disconnection voltage (e.g. anti-parallel diode) or voltage limiting components (e.g. varistors,
suppressor diodes, resistance diodes and the like) can be installed. However, such components will
inevitably change the switching times of the brake and increase the generated noise level. The rectifiers
specified in Section 3.3 are equipped with free-wheel diodes and/or varistors to limit the disconnection
voltage. In case of DC side switching, a varistor rated for the type-specific maximum operating voltage
and connected in parallel with the field coil (1.2) limits the peak voltage to the values specified in
Table 17/2.
to
a
DC
power
source,
A
equipment.
They
have
built-in
Operating Instructions BA 77 600..A00 // Last updated: 13/03/2020 // Page 16 of 33
the
R
U
Interference
C
interference
Fig. 16/1
L
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