Warner Electric CB Series and Super CB Series Sizes 2, 4, 5, 6 and 8 - Manual (Page 7)

7 Warner Electric • 800-825-9050 P-258 • 819-0406
Troubleshooting Checklist
The actuator is simply a mechanical linkage. When the actuator does not function, the following inspection
should be made.
Possible Problem Recommended Action
1. No power going to the coil (check
w/voltmeter).
A. Check all wiring and switching in the system that supplies power to the
clutch coil, and ensure its continuity.
B. If wiring is correct, inspect to see if power is coming from the power
supply. If there is no power from the power supply, check switching or
programming and/or replace power supply as necessary.
2. Lack of continuity in coil windings
(check w/ohmmeter).
Check the continuity of the clutch coil windings by using an ohmmeter, and
replace the coil if necessary. After the coil is replaced, ensure it is properly
aligned as described in Step 3A below.
3. Mechanical binding of plunger. A. Realign coil. As shown in Figure 5, with the coil energized, apply light
pressure to the opposite side of the control collar, and set the
actuator/cam tip clearance (airgap) at .010'' to .030''. Note: For AC
coils with an actuator limit stop (ALS) option, the actuator should hit the
ALS and bottom simultaneously.
B. If Step 3A fails to resolve the problem, replace the coil assembly and
perform Step 3A again to realign the coil.
4. Actuator does not clear the cam stop Realign coil as in Step 3A above.
5. Collar pushes so hard on the actuator
that the coil is unable to pull in.
A. Actuator loading can be caused by the braking force exceeding the
capacity of the brake spring. Confirm the application criteria and re-
evaluate the unit size for this application.
B. If the spring differential setting is too large, the clutch spring could be
opening into the control collar and acting as a brake. In this case, the
spring differential must be reset (See Section 5 “CB Spring Differential
Adjustment”).
C. If the coil has been replaced with an air cylinder, ensure that the cylinder
is square to the collar and that the actuator has the proper travel.
Inspect the air source and supply to ensure the cylinder is receiving air
when appropriate.