nord 6052902/0213, Manual With Installation Instructions

Page: 60 / 128

Industrial gear units – Manual with installation instructions
60 B 1050 en-3921
3.25.2 Limit switch to indicate the brake lining wear (option SLW)
While being operated, the brake lining of a mechanical brake is subject to wear. The option SLW
indicates when the wear limit is reached and the brake lining must be replaced.
3.25.3 Connecting the NC/NO contacts (Option: SO/SC)
The Option SO/SC comprises limit switches that make it possible to report the switching state of the
mechanical brake (open/closed).
The switching state of the limit switches is evaluated by a higher-level control. The correct connection
and the processing of the switching states must be ensured by the operator.
With proper evaluation, the Option SO/SC prevents e. g. the drive from starting while the brake is
applied.
3.25.4 Manual release and manual release with limit switch (option: MR, Option: MRS)
WARNING
Unexpected movement
Operating the manual release will disengage the brake. This can result in unexpected drive
movements even if the drive is switched off electrically.
• Safeguard the hazard zone.
• Secure the drive against impermissible movement before actuating the manual release.
• Disengage the machine.
• Do not lock the manual release.
Options MR and MRS comprise a manual release of the brake. With these options, the contact
pressure and thus the brake torque can be reduced or cancelled entirely.
The option MRS features an additional limit switch. This limit switch reports the switching state of the
manual release and can be accordingly evaluated by a higher level control unit.
Information
You must check and if necessary correct the function of the limit switch after the brake linings are
replaced.
3.26 Subsequent painting
For retrospective painting of the gear unit, the shaft sealing rings, rubber elements, pressure vent
screws, hoses, type plates, adhesive labels and motor coupling components must not come into
contact with paints, lacquers or solvents, as otherwise the components may be damaged or made
illegible.