Maintenance; Checks And Service - Kendrion EEX Series Operating Instructions Manual

Warning!
Any adjustment of the rated torque must be performed by the manufacturer or by authorized specialist
personnel.

4. Maintenance

4.1 Checks and service

The spring-applied single-disc brake does not require any particular maintenance except that the friction disc
(5) must be replaced when worn (see "Technical specifications" for information on the maximum air gap s
and that the safety switches (microswitch (13)
service and maintenance measures must be performed during the general inspection of the electric machine
(e.g. motor). Make sure that the spring-applied brake is unpowered and that the explosion protection is not
interfered with when carrying out service and maintenance work. When opening the flameproof enclosed
solenoid housing (1.1) to replace the friction disc (5), for example, the safety information provided in this
manual must be strictly observed. Always check that the flameproof gaps are in perfect condition. Do not use
spare parts other than original spares supplied by the manufacturer of the spring-applied brake.
Caution!
Before you perform repair work on components which form flameproof gaps, consult the brake manufacturer
for information on the gap dimensions. This is crucial because the dimensions of the flameproof gaps of the
brake described in this manual may have to be longer and the gap widths may have to be narrower than those
specified in Table 2 (3) of EN 60079-1:2014.
Warning!
In case the explosion protection features of the spring-applied brake are damaged during maintenance or
repair work, the brake must be checked by an authorized expert before it can be reused. Any measures
required to restore explosion protection must be performed by the manufacturer or by specialist repair shops
(see Section 13).
Brake removal from the machine (e.g. motor):
Loosen the socket head cap screws (27) provided on the cover (26) of the junction box (25) and remove the
cover (26). Disconnect the strands of the connecting cables (field coil (1.2) and safety switches) from the
terminal block (19). Unscrew the cap nut (30.1) of the cable gland (30) and remove the connecting cables from
the junction box (25). Loosen the mounting screws (10). Remove the brake from the shaft with the two pull-off
threads provided on the solenoid housing (1.1) and by means of socket head cap screws (e.g. to ISO 4762).
Checking the air gap 's':
Loosen the socket head cap screws (20) provided on the cover (7) and remove the cover (7). Place a
measuring bridge with dial gauge on the flange (3) to measure the air gap 's'. Position the measuring tip of the
micrometer screw on the friction disc (5).
Release the spring-applied brake so that the air gap 's' can be determined from the difference between the
values indicated by the dial gauge.
Attention!
Temporary electric release of the spring-applied brake is required to allow the air gap 's' to be measured. For
information on the electrical connection of the brake to the power source, please refer to Section 3.3.
Brake types with microswitch.
3)
and thermoswitches (11 & 12) need to be checked. These
3)
Operating Instructions BA 76..G..B00 // Last updated: 13/03/2020 // Page 19 of 34
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