EATON Airflex WSB 11210 WCSB3 Installation Operation and Maintenance E-CLCL-11001-E October 2013
15
Warning
Friction lining must be worn-in to achieve product
torque rating for new installations or after repair.
Verify proper operation before putting the product
into service. See Section 3.3 for additional burnishing
procedures.
Warning
Protective means must be used to prevent oil,
grease, dirt or coolant from coming into contact with
the surfaces of the friction discs (8) or the wear plates
(3). Oil or grease on these parts will significantly
reduce the torque capacity of the unit. Dirt or coolant
will produce erratic torque. Do not risk personal injury
of damage to the equipment.
Warning
Maximum free-wheeling speed must not exceed the
speeds listed in Table 11. Exposure to speeds in
excess of these values may cause the friction discs
(8) to burst and result in extensive damage to the
tensioner and/or cause personal injury.
Caution
For proper cooling of the WCSB3 tensioner, it is
required that the coolant inlet and outlet manifolds be
located as close as possible to the tensioner. It is
recommended that the inlet hoses are of the same
length and all outlet hoses are of the same length.
Caution
For operation in subfreezing temperatures, ethylene
glycol antifreeze must be added to the water. The
antifreeze content of the mixture is critical and should
not exceed 50% by volume. Excessive amounts of
antifreeze will reduce cooling capacity and can cause
coolant leakage due to overheating. Refer to Table 10
for the percentage of water/ethylene glycol mix and
the corresponding maximum outlet coolant
temperature.
Caution
The coolant outlet temperature should not exceed
the values given in Table 10. However, in no event
should there be more than a 50°F (28°C) temperature
rise between inlet and outlet. See Table 10 for maxi-
mum allowable outlet coolant temperature with
various water/ethylene glycol mixtures and other
cooling media.
Caution
Maximum ambient temperature is 110°F (43°C). Mini-
mum ambient temperature for closed loop systems
using ethylene glycol antifreeze is 0°F (-18°C). For
open loop systems using water as a coolant, the mini-
mum ambient temperature is 45°F (7°C)
Caution
The tensioner is never to be operated without the
coolant supply attached and coolant running through
the unit.
3.2
Pressure and Speed Limits
3.2.1 Maximum allowable coolant pressure is 40 psig (2.8
bar) for size 36WCSB3 units. The use of an
accumulator or pressure relief valve may be desirable
to reduce the effect of pressure spikes in the coolant
system during operation.
Warning
Applied pressure or surges exceeding maximum
allowable may result in damage to the tensioner.
3.2.2 Maximum slip speeds and free-wheeling disc speeds
are shown in Table 11.
Caution
Excessive slip speeds will result in rapid friction
material wear. For good life, the values in Table 11
should not be exceeded.
3.2.3 Maximum allowable air pressure is 120 psig (8,2 bar)
in the spring set brake cylinder (19). Refer to the
assembly drawing (available on request) for minimum
pressure required for full release of the spring set
brake. Release pressure is dependent upon the
quantity of springs (22) (52) used in the specific brake.
Note: Maximum air pressure is 150 psig in the air applied
tensioning cylinder for 2 and 3 disc 36WCSB3 tensioners.
Maximum allowable air pressure is 120 psig for the 436WCSB3
tensioner with MIDCO friction discs. The WCSB3 mounting is
designed for safe operation up to 2,500,000 in-lb. braking torque.
Refer to the assembly drawing (available on request) for specific
pressure and/or torque limits.
3.2.4 Maximum operating pressure of the cylinder (19) - air
applied side of the tensioner- is 120 psig (8,2 bar).
Minimum release pressure of the spring set brake is
120 psig (8.2 bar).
3.2.5 Maximum operating pressure of the mounting flange/
cylinder (112) is 120 psig (8,2 bar).
Warning
Operating cylinder (19) or mounting flange/cylinder
(112) at pressure above 120 psig (8,2 bar) may cause
damage to the tensioner. Heat generated during
operation could result in damage to brake
components.
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 WCSB3 brakes be worn-in prior to normal
operation to improve contact of the mating friction
surfaces.
WCSB3 Brakes
Table 11
Maximum Disc Speeds
Maximum Slip
Maximum Free Wheeling
Size
Speed (Rpm)
Speed (Rpm)
36WCSB3 475
700
