EATON Airflex WSB 11210 WCSB3 Installation Operation and Maintenance E-CLCL-11001-E October 2013
16
WCSB3 Brakes
Caution
Machine operation should be monitored closely until
the friction couple wears in.
3.3.2 The shaft on which the brake discs are mounted
should be free to rotate to allow for run-in. On draw-
works applications, disconnect the wire rope from
the draw-works drum to allow operation as described
in the following paragraphs.
3.3.3 Ensure that the coolant system is operating prior
to dynamic operation of the WCSB3 tensioner. Verify
that coolant temperature, pressure and flow values
are within required settings or limits during operation.
See Table 6, Table 7 and Table 10.
Caution
Dynamic operation of the WCSB3 - including while in
the fully released condition - is not recommended
without proper coolant flow in the tensioner. Heat
generated during operation could result in damage to
brake components.
3.3.4 Release the brake by applying full release air pressure
through the ports in the cylinder (19) to allow the
brake to freely rotate. Apply no air pressure to the
tensioner pressure ports in the mounting flange/
cylinder (112).
3.3.5 Run the motor to achieve a brake disc speed listed in
Table 12. Exhaust the air pressure in the brake rapidly
to 90 psi (6,1 bar). Slip the brake for the time
specified in Table 12, but DO NOT ALLOW THE
BRAKE TO SLIP FOR MORE THAN THE TIME
SPECIFIED.
Caution
Slipping the brake at increased time intervals, speeds
or pressures other than specified will result in dam-
age to brake components.
3.3.6 After the brake has engaged/slipped for up to the
maximum slip time specified in Table 12, quickly
apply full air pressure to completely release the brake.
Smoke rising from the brake should be expected.
Free-wheel the brake discs at the speed listed
in Table 12, allowing the brake disc (119) to cool to
a temperature below 120°F (49°C). The use of fans
or clean, dry compressed air can be used to
accelerate the cooling process.
Caution
Use proper safety precautions when using forced
ventilation.
3.3.7 Monitor the brake disc (119) temperature after
slipping and cooling. Do not allow the brake disc
temperature to exceed 180°F (82°C).
3.3.8 Repeat steps 3.3.4 thru 3.3.7 for the number of
cycles shown in Table 12 to allow for adequate wear-
in of the air-cooled brake. Allow the brake disc to
completely cool to ambient temperature prior to
testing the torque capacity of the brake or returning it
to service.
3.4
Operational Sequence
3.4.1 Ensure that the coolant system is operating prior
to dynamic operation of the WCSB3 tensioner. Verify
that coolant temperature, pressure and flow values
are within require settings or limits during operation.
Caution
Dynamic operation of the WCSB3 - including while in
the fully released condition - is not recommended
without proper coolant flow in the tensioner. Heat
generated during operation could result in damage to
brake components.
3.4.2 Air pressure is first applied through the ports in the
mounting flange/cylinder (112) to apply force to the
piston (33) in the tensioner. Adequate pressure
should be applied to support the load the tensioner is
controlling. Air pressure is then applied through the
ports in the cylinder (19) on the spring set section of
the unit, until it is fully released.
Caution
Observe all pressure and speed limits while operating
the WCSB3 tensioner. See Section 3.2.
3.4.3 After release of the spring set brake, slowly relieve
the air pressure within the mounting flange/cylinder
(112) to reduce the clamp force applied to the friction
disc assemblies (7), allowing the shaft to rotate.
Modulation of the air pressure will vary the applied
torque of the tensioner. Modulation control is
dependent upon the specific pneumatic control
system used. Refer to the manufacturers’ information
for operation of control valves or feedback systems.
3.4.4 WCSB3 tensioners with dual pressure pistons (33)
provide a more finite range of control. Each chamber
within the dual pressure piston can be pressurized
independently or simultaneously.
Caution
When applying or exhausting operating pressure to
only one of two ports on units with dual pressure pis-
tons (33), the second piston pressure port must be
open (vented) to atmosphere. Open ports should be
filtered to avoid contamination of the piston and
cylinder during piston operation.
Table 12
Wear-In Parameters
Operation
Wear-in
Speed
Slip Time
Cycles
Size
(RPM)
(Seconds) Required
36WCSB3 60
20
30
