DE-STA-CO Ferguson Rite-Torq Torque Limiters (Overload Clutches) Type RT, RTM, RTL, RTL-FCB - Manual (Page 14)

14
RTL & RTL-FCB Series
NOTE: Trip torque should be less than the maximum the machine can absorb without risk
but great enough to prevent undesirable nuisance tripping due to inertia or starting loads.
Ideally, trip torque should be approximately 40% higher than the operating torque of the
machine.
WARNING: IF THE DRIVE HAS A BRAKE MOTOR, THE TRIP SETTING MUST BE WELL
ABOVE THE BRAKE TORQUE; OTHERWISE WITH A HIGH INERTIA DRIVE, THE CLUTCH MAY
TRIP WHEN THE BRAKE IS APPLIED, ALLOWING THE MACHINE TO RUN UNCONTROLLED
BY THE BRAKE.
Number
Approximate Static Trip Torque
(IN-LBS)
Of
Turns
RTL-5 RTL-50 RTL-60 RTL-120
0 500 2000 6000 12000
½ 450 1900 5500 11500
1 375 1700 5000 10500
1 ½ 300 1500 4500 9500
2 225 1300 4000 9000
2 ½ 150 1200 3500 8000
3 100 1000 3000 7000
3 ½ ----- 800 2500 6000
4 ----- 600 2000 5000
4 ½ ----- 500 1700 4500
5 ----- 400 1400 4000
5 ½ ----- ----- 1200 3500
6 ----- ----- ----- 3000
6 ½ ----- ----- ----- 2400
CHART 6
1. Adjust trip torque (Figure 8) by loosening locknuts.
2. Tighten torque adjusting screws all the way down.
3. Back torque adjusting screws off the number of turns in Chart 6 to the desired torque range.
4. Tighten locking nuts to maintain setting.
5. Check the distance between torque adjusting screw heads and locking nuts. All must be the same to insure even spring
compression.
NOTE: All Industrial Motion Control detent clutches are reset by:
1. Turning the power off.
2. Clear jam condition.
3. Rotate machine manually or slow jog until clutch snaps back in the home position. Torque limiter
will re-engage from either direction.
FIGURE 8