3.0
OPERATION
3.1
Conditions of Operation
The following Hazard Warnings are to be
followed for proper WCB2 functioning:
Friction lining must be worn-in to
achieve product torque rating.
For new installations or after repair,
a minimum wear-in period for the
friction couple of four hours at 50% of
the rated horse-power is recommended
to achieve rated torque. Verify proper
operation before putting the product
into service.
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 or damage to the
equipment.
Maximum free wheeling speed must not
exceed the speeds listed in
Table 9. 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.
For proper cooling of the WCB2
tensioner, it is required that the cool-
ant inlet be located as close as pos-
sible to the 6 o’clock position and
the outlet be located near the
12 o’clock position. This will
help to assure that all coolant
cavities are water-filled to help
avoid overheating.
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 cool-
ant leakage due to overheating. Refer
to Table 8.
Maximum ambient temperature is
110
o
F (43
o
C ). Minimum ambient tem-
perature for closed loop systems using
ethylene glycol antifreeze is 0
o
F (-18
o
C).
For open loop systems using water as
a coolant, the minimum ambient tempera-
ture is 45
o
F (7
o
C).
TABLE 7
Coolant Pressures, psi (bar)
Maximum
Static
Maximum
Inlet*
Maximum
Outlet*
Minimum
Outlet
Maximum
Delta
(In-Out)
Minimum
Delta
(In-Out)
Maximum
Average
Minimum
Average
Size
8WCB2
45 (3,1)
65 (4,5)
25 (1,7)
0
65 (4,5)
40 (2,7)
45 (3,1)
32.5 (2,2)
14WCB2
45 (3,1)
65 (4,5)
25 (1,7)
0
65 (4,5)
40 (2,7)
45 (3,1)
32.5 (2,2)
18WCB2
45 (3,1)
65 (4,5)
25 (1,7)
0
65 (4,5)
40 (2,7)
45 (3,1)
32.5 (2,2)
24WCB2
45 (3,1)
65 (4,5)
25 (1,7)
0
65 (4,5)
40 (2,7)
45 (3,1)
32.5 (2,2)
36WCB2
40 (2,7)
60 (4,1)
20 (1,4)
0
60 (4,1)
40 (2,7)
40 (2,7)
30 (2,06)
48WCB2
40 (2,7)
60 (4,1)
20 (1,4)
0
60 (4,1)
40 (2,7)
40 (2,7)
30 (2,06)
* Under dynamic flow conditions.
NOTE: Above ratings for tensioning / winding type applications. For high cyclic applications, consult the factory.
WCB 11070 VP 4.2 Format
12
© Copyright Eaton Corp., 2003. All rights reserved
April 2002 (Revised June 2003)