Siemens SIMOTICS M-1PH8 - Page 189

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① Oval head screw (2x) ⑤ Bracket
② Cylinder head screw (2x) ⑥ Hexagon bolt M2.5x8 (not included in the scope of
delivery)
③ Bellows ⑦ Dowel pin
④ Bolt ⑧ Microswitch
Figure5-5 Microswitch mounting of a single-disk spring-operated brake module 77 500...B15
Electrical connection
WARNING
Fire hazard and risk of destroying the brake module
The brake module is an electromagnetic component and a DC system. An impermissibly high
connection voltage at the brake module can cause the recti󹪝er or the winding to burn. This can
block the brake module, causing it to overheat.
If the connection voltage is too low, the magnetic excitation will also be too low, preventing the
brake from being released. The brake goes into the brake mechanism although this is not
wanted.
• Make sure that the connection voltage of the brake module remains within the permissible
tolerance of +10 % to -10 % of the nominal voltage. Comply with the legal standards for
connection to the grid. Pay attention to the correct dimensioning of the cable lengths and
conductor cross-sections in the connection cables.
• Check the electrical connection of the holding brake based on the following checklist.
Table 5-16 Checklist for checking the electrical connection of the holding brake
Check OK
The connection cables are suitable for the type of use and the voltages and currents that occur. 
The connection cables are connected correctly by means of screws, clamps or other equivalent means, so
that the electrical connection is maintained permanently.

Motor components and options
5.2Options
1PH8 SIMOTICS M main motors
Con󹪝guration Manual, 12/2022, A5E51895839A 187