EATON
WSB11206 WCSB Tensioner / Brake with ORB Coolant Ports Installation, Operation and Maintenance Manual E-CLCL-II009-E
August 2015
14
WCSB tensioner / brake with ORB coolant ports
3.3 Wear-in
Procedures
3.3.1 In order to improve initial operation and
brake torque, it is suggested that the non-asbestos
friction material used in WCSB tensioner / brake
assembly be worn-in prior to normal operation to
improve contact of the mating friction surfaces.
Caution
Machine operation should be monitored closely
until the friction material 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 drawworks applications, disconnect the
wire rope from the drawworks 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 WCSB tensioner / brake
assembly. Verify that coolant temperature, pressure
and flow values are within required settings or limits
during operation.
Caution
Dynamic operation of the WCSB tensioner / brake
assembly including while in the fully released
condition is not recommended without proper coolant
flow in the WCSB tensioner / brake assembly. Heat
generated during operation could result in damage
to WCSB tensioner / brake assembly components.
3.3.4 Release the brake by applying full release pressure
through the ports in the cylinder (19) to allow the
brake to freely rotate. Apply no 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 6. Exhaust the air pressure in the brake
rapidly to 90 psig (6.1 Bar). Slip the brake for the
time specified in Table 7, but DO NOT ALLOW
THE BRAKE TO SLIP FOR MORE THAN THE
TIME SPECIFIED.
Caution
Slipping the WCSB tensioner / brake assembly
at increased time intervals, speeds or pressures
other than specified will result in damage to WCSB
tensioner / brake assembly components.
3.3.6 After the WCSB tensioner / brake assembly has
engaged / slipped for upto the maximum slip time
specified in Table 7, quickly apply full air pressure
to completely release the WCSB tensioner / brake
assembly. Smoke rising from the brake should be
expected. Freewheel the brake discs at the speed
listed in Table 7, allowing the brake disc (119) to
cool to a temperature below 120
o
F (48
o
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.
Table 7
Wear-in Parameters
Operating
Slip
Time
Wear-in
Cycles
Size Speed
(RPM)
(Seconds)
Required
24WCSB 120
16
30
36WCSB 60
20
30
48WCSB 30
20
30
3.3.7 Monitor the brake disc (119) temperature after
slipping and cooling. Do not allow the brake disc
temperature to exceed 180
o
F (82.2
o
C).
3.3.8 Repeat steps 3.3.4 thru 3.3.7 for the number of
cycles shown in Table 7 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 WCSB tensioner / brake
assembly. Verify that coolant temperature, pressure
and flow values are within required settings or limits
during operation.
Caution
Dynamic operation of the WCSB tensioner / brake
assembly 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.
Summary of Contents for Airflex WSB11206
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