ThyssenKrupp Mini gearless DAF270, Operating Manual

Page: 53 / 76

O
PERATING
M
ANUAL
7. M
AINTENANCE
ThyssenKrupp Aufzugswerke GmbH
53
Issue 06.2004
Replacing of dual-circuit disc brake (Warner)
Note: for safety reasons, the brake must be completely replaced as soon as
the brake is defective or the wear limit reached.
Exchange of the brake to be made in the house Warner.
To replace the brake proceed as follows:
Disasssembly:
•
Switch off power supply and secure installation against unintentional
switching on
•
Rest counterweight on buffer; secure car
•
Remove cover plate at brake
•
Disconnect or unplug connecting cables between brake monitoring
switch, PTC thermistor and brake connections at brake.
Remove terminal connection between encoder and motor shaft. Remove
fixing strap at brake housing and encoder at the same time. Assembly
instructions see chapter 7.2.
•
Attention! Prior to continue disassembly screw in enclosed red hexagon
sockets (M8x150). In case of disregard the brake parts will be separated
by spring force.
•
Screw transport eyebolts (M12) into side threads at the brake housing
circumference. Fix brakes at lifting device
•
Mark position of connection box at drive
•
Remove fastening screws (fig. 19 pos. 8)
•
Carefully push off brake housing and rotor from toothed sleeve (fig. 19
pos. 11) and place aside
•
Carefully push off rear rotor at bearing bracket (use two screw drives as
lever, if necessary)
Note: the toothed sleeve is pushed over the shaft end of the warmed up
drive (240°C). Non-defective pushing off is not possible, therefore. Re-use if
toothing is free from any visible damage.
Assembly:
•
Fasten new brake at lifting device
•
Clean and slightly grease toothed sleeve at motor shaft end
•
Replace defective O rings at toothed sleeve, if necessary
•
Clean braking surface at bearing bracket of drive using special cleaner
and slightly grease (with DELOTHEN NK1, for example)
•
Mount front brake rotor to toothed sleeve (make sure that the rotor is
mounted the right way round; hub collar backwards!)
•
Align new brake towards toothed sleeve using lifting device. Observe
position of connection box (marking at bearing bracket).
•
Before you start mounting the brake, connect the brake coils and make
sure that the brake is open. In case of disregard, the brake rotor blocks
and the brake housing cannot be moved and aligned while fitting the
screws.
•
Mount brake and second brake rotor; tighten fastening screws and
observe proper tightening torque.