EATON
Torque Limiting Coupling Installation, Operation and Maintenance Manual E-MEQD-II002-E September 2015
12
Torque Limiting Coupling
3.0 Operation
Warning
Exceeding the operating limits described in this
section may result in personal injury or
equipment damage.
3.1
Torque, RPM and Pressure Limits
3.1.1
The developed torque is directly proportional to
the applied air pressure. If the developed torque
seems inadequate, check for oil, grease or dust
contamination of the TLC elements or other drive
train conditions that are causing an overload
condition to occur.
Caution
Maximum applied air pressure is 125 psig (8.5 bar).
Operation at pressures exceeding 150 psi may cause
element damage.
Caution
The special (non-asbestos) friction material used
in Airflex TLC units may not develop rated torque
initially, if required a very short “wear-in” procedure
may be required. (See the procedure note.)
3.1.2
Maximum safe operating speeds are shown
on Table 3.
Danger
Do not exceed the operating speeds shown on
Table 3. Operation at speeds greater than allowable
will result in permanent damage to the TLC element,
personal injury or death.
3.2
Control component adjustment
3.2.1
Set the pressure switch (5) located on the air receiver
tank to open at 60 psig (6.1 bar) falling. Use normally
open contacts and wire in series with the solenoid
valve coil. This is to prevent TLC engagement if
operating pressure is below 60 psig or the specified
application pressure setting.
3.2.2
Set the pressure switch (13) located in the air
supply line to the TLC to close at a predetermined
minimum pressure. Use normally closed contacts
and wire into the motor starter interlock circuit. The
purpose of this pressure switch is to prevent starting
the motor with the TLC disengaged.
3.2.3
Set the pressure regulator to the specified minimum
pressure for the application. This is the nominal air
pressure required for operation of the TLC to
start the mill.
3.2.4
Check all other interlocks that affect the starting
of the mill and remove any jumpers that may have
been installed.
4.0 Maintenance
Warning
Only qualified personnel should maintain and repair
these units. Faulty workmanship may result in
personal injury or equipment damage.
Caution
When replacing TLC components, use only genuine,
Airflex replacement parts. Use of replacement
material which is not of Airflex origin will void
all warranties.
4.1
Periodic inspection
4.1.1
The following items may be inspected without
disassembly of the TLC.
4.1.1.1 Friction shoe assembly lining wear - Check the
lining thickness and compare to the values
shown on Table 4.
Note: If the linings have worn to minimum allowable thickness or
less, the friction shoe assemblies must be replaced as a
complete set.
4.1.1.2 Contamination of shoes or drum oil, water or grease
contamination will reduce the developed torque of
the TLC. If this occurs the replacement of the friction
shoe assemblies will be required.
Note: In extremely dusty environments, dust may accumulate
in the backing plate cavities to the point where the friction shoes
will not properly retract. Dust accumulations may be vacuumed
out of the element cavities.
Table 4
Friction material thickness
Min. allowable
Original lining
Element
lining thickness,
thickness,
size
inch (mm)
inch (mm)
51TLC1600
.470 (22,9)
.687 (17,4)
60TLC1600
.445 (11,3)
.687 (17,4)
66TLC1600
.531 (13,5)
.750 (19,1)
76TLC1600
.522 (13,3)
.750 (19,1)
76TLC2000
.519 (13,2)
.750 (19,1)
Table 3
Maximum safe operating speeds
Size
Maximum RPM
51TLC1600 550
60TLC1600 520
66TLC1600 480
76TLC1600 275
76TLC2000 275
