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Attention!
To avoid damage (e.g. burns or fusing of contacts) to the external circuitry in case of DC side brake switching,
additional protection elements (e.g. varistors, spark arresters, etc.) are necessary.
Warning!
Work on the brake must only be carried out by suitably qualified personnel. Make sure that no voltage is applied
during brake connection. The specifications on the rating plate and the information provided in the circuit
diagram in the terminal box or in the operating instructions must be strictly observed.
Warning!
The brake is a DC operated system. Permanent voltage variations on the power source of the electromagnetic
brake must be limited to +/-10% of the rated voltage.
The following checks must be carried out when connecting the brake:
•
Check that the connecting cables are suitable for the intended use and for the voltage and amperage of
the brake.
Check that the connecting cables are secured with screws, clamps or other suitable fixtures to avoid
•
interruptions in the power supply.
Check that the connecting cables are long enough for the intended use and that suitable torsion, strain
•
and shear relief features as well as bending protections are provided.
•
Check that the PE conductor (only for protection class I) is connected to the earthing point.
Check that no foreign matter, dirt or humidity is trapped inside the terminal box.
•
•
Check that unused cable entries and the terminal box are suitably sealed to ensure compliance with the
protection class requirements to EN 60529.
3.3.2 Microswitch (13) and thermoswitch (11 & 12) connection
The four (2x2) thermoswitches (11 & 12) and the microswitch (13) provided to control the release status of the
spring-applied single-disc brake are factory-connected in series. These safety switches (microswitch (13) and
thermoswitches (11 & 12)) must be tied into the control circuit of the machine (e.g. motor) (see Fig. 13/1). This
is necessary to ensure that the microswitch (13) prevents machine (e.g. motor) start-up before the brake has
been released. The four (2x2) thermoswitches (11 & 12) connected in series with the microswitch (13) interrupt
the control circuit of the machine (e.g. motor) as soon as the temperature measured at the individual measuring
points of the thermoswitches (field coil (1.2) and flange (3)) exceeds the maximum permitted temperature. The
cover (26) of the junction box (25) must be removed to allow the connecting cable of the safety switches
(microswitch (13) and thermoswitches (11 & 12)) to be installed. The customer-specific connecting cable for
the safety switches can be introduced into the junction box (25) of the spring-applied single-disc brake through
the cable gland (30) (M20x1.5) provided (see Section 3.3). The cable strands must be connected to terminals
5 (TB1) and 6 (TB2) of the terminal block (19) (see Section 3.3, Fig. 11/2). After completion of these steps,
reinstall the cover (26) of the junction box (25).
Attention!
When fixing the cover (26) to the junction box (25), the M
(27) specified in Table 15/1 must be strictly observed.
tightening torques for the socket head cap screws
A
Operating Instructions BA 76..G..B00 // Last updated: 13/03/2020 // Page 14 of 34
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