WCB11070 (PDF FORMAT)
10
©
Copyright Eaton Corp. 2007, All Rights reserved.
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 con-
tact 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 pro-
duce 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 coolant inlet be located as
close as possible to the 6 o'clock position and
the outlet be located near the 12 o'clock posi-
tion. This will help to assure that all coolant
cavities are water-filled to help avoid over-
heating.
For operation in subfreezing temperatures,
ethylene glycol antifreeze must be added to
the water. The antifreeze content of the mix-
ture 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 temperature for
closed loop systems using ethylene glycol
antifreeze is 0
o
F (-18
o
C). For open loop sys-
tems using water as a coolant, the minimum
ambient temperature is 45
o
F (7
o
C).
TABLE 7
Coolant Pressure, psi (bar)
Size
Maximum
Static
Maximum
Inlet*
Maximum
Outlet*
Minimum
Outlet*
Maximum
Delta (In-
Out)
Minimum
Delta (In-
Out)
Maximum
Average
Minimum
Average
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.
