EATON Airflex WSB 11210 WCSB3 Installation Operation and Maintenance E-CLCL-11001-E October 2013
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2.3.5 Spool type solenoid valves are not recommended for
the spring set side of the brake. Use poppet type
valves and locate them as close as possible to the
cylinder (19).
2.3.6 The WCSB3 tensioner does not require lubricated air;
however associated control valves may. Consult the
valve manufacturer for appropriate recommendations.
Caution
The use of lubricated air in the air supply system
(if required) will require the addition of a ‘point
of use’ lubricator. Lubricated air is not required
for the Eaton Tensioner but once lubrication is used,
lubrication will always be required in the air system. If
the lubricator is allowed to run dry then pneumatic
valves and cylinders will dry out and stick thus creat-
ing erratic operation and down-time. Good engineer-
ing design practices shall be followed when using
lubrication thus avoiding the overuse of lubrication,
long airline runs and elevation changes.
2.3.7 A pressure switch should be located in the air supply
line to the tensioner and interlocked with the
equipment electrical controls to guard against
operation of the tensioner when the brake is set.
2.4
Coolant System
Note: Positioning the drain plug (105) at a nominal 6 o’clock
position will help insure the coolant outlets are at a nominal 12
o’clock and 6 o’clock position.
2.4.1 The 36WCSB3 is designed with four (4) coolant ports
on each pressure plate (116), end plate (117) and
reaction plate (30). Each plate has two opposing
inlet ports and two opposing outlet ports. In order to
mount the 36WCSB3 with the coolant inlet and
outlet ports in the proper orientation, first locate
the air purge port (drain plug (105)) on the cylinder
(19) on the spring-set brake. With the drain plug (105)
located at a nominal 6 o’clock position, the drain and
supply ports will be in the proper orientation. The
coolant supply ports shall be located at a nominal 3
o’clock and a nominal 9 o’clock position and the
coolant drain (return) ports shall be located at a
nominal 12 o’clock and a nominal 6 o’clock position.
2.4.2 The WCBD3 water cooled brake is designed with
SAE O-ring Boss (ORB) ports for the coolant inlets
and outlets. These ports utilize a straight thread and
an O-ring for sealing. ORB ports provide superior
sealing properties and reduce the risk of damage
to the brake during fitting installation. An ORB port
can be identified by the machined spot face and a
chamfer (for sealing of the O-ring). See Figure 4.
Follow the fitting manufacturer’s recommendation
for the proper method of installation and tightening.
Torque to values per Table 4. The 36WCBD3 uses
the SAE-20 for the ORB port size.
Caution
Installation of NPT or other incompatible threaded
piping or fittings into SAE ports will damage the
ports, resulting in leakage or other failure.
2.4.3 Each inlet and outlet coolant port in each pressure
plate (116), reaction plate (30) and end plate (117) is
designed with a ‘fixed’ orifice. The fixed orifice is
designed to proportion the flow to what is required by
each component. Thus, a reaction plate that requires
a total of 100 GPM has the ports designed to pass
50 GPM per port. Similarly, a pressure plate that
requires 50 GPM has the ports designed to pass
25 GPM per port. (The pressure plate and the end
plate are designed for 50% of the flow of the reaction
plate). It is recommended, however, that the flow
rate from each section be verified with some type of
flow metering device.
2.4.4 After measuring the flow from each coolant section,
an adjustment may be required. Thus, it is
recommended that each drain side (or return side)
should be equipped with adjustable flow controls on
each outlet hose. The flow for each size tensioner
should be balanced as shown Table 6.
2.4.5 Maximum allowable coolant pressure within the
water cavity is 40 psig for size 36WCSB3 units. See
Table 7 for coolant pressure limitations as measured
at the inlets and outlets of water jackets.
WCSB3 Brakes
Table 6
Percentage of Flow Required for each Coolant Section Outlet
36WSB3
Tensioner Size
236
336
436
Pressure Plate 12 o’clock
25.00%
12.5%
8.00%
Pressure Plate 6 o’clock
25.00%
12.5%
8.00%
Reaction Plate 12 o’clock
n/a
25.0%
17.00%
Reaction Plate 6 o’clock
n/a
25.0%
17.00%
Reaction Plate 12 o’clock
n/a
n/a
17.00%
Reaction Plate 6 o’clock
n/a
n/a
17.00%
End Plate 12 o’clock
25.00%
12.5%
8.00%
End Plate 6 o’clock
25.00%
12.5%
8.00%
Total
100.00%
Note: Each Coolant Section has two Outlets. The Outlets are located at the 12 o’clock
and 6 o’clock position. Flow controls (if required) should be installed in each outlet and
adjusted to provide the percentage flow shown above.
Figure 4
