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Troubleshooting:
- If the electric clutch is not functioning / slipping beyond normal operating characteristic:
o Check system supplied voltage. Under a static energized condition the clutch should
be pulling 12 VDC @ 4.89 Amps with 2.45 Ohms (+/- 5%) of resistance across the
coil and 24 VDC @ 1.26 Amps with 9.51 Ohms (+/- 5%) of resistance across the
coil; depending on the clutch (12 or 24 VDC) being used. Note that these figures
are at an ambient temperature of 68
o These figures can be checked with the correct measuring/inspection equipment.
Such as a properly calibrated Multi Meter with a Current Clamp.
o Any deviation from these figures when experiencing clutch challenges could indicate
a problem with the clutch coil or an insufficient supply voltage and current. Contact
W.S. Darley Customer Service if these problems occur.
- Vibration in belt/clutch assembly:
o Could be indicated by:
Damaged Belt
Contaminated Bearing
Loose clutch body mounting bolt (through clutch bore into primer rotor/shaft
assembly)
Loose bolts holding belt tension
Damaged rotor/shaft assembly
Damaged or broken primer vane
Particulate trapped in primer/rotor body vane area
Excessive slipping in between clutch armature assembly and friction material
Prepared by: RJG
Revised by: JAF
Approved by: WAH
Revisit the primer assembly drawing and contact W.S. Darley Customer
Service if necessary. Proper belt tension is a must.
Belt tension can be inspected and validated by:
o Placing a 6 lb– 7 lb force on the belt along its periphery directly
between the center axis of each pulley. The belt should
deflect approximately 5/32" +/-.015"; beyond these figures in
either direction +/- will yield a belt tension that is to loose or to
tight and will detrimentally affect belt, sheave and clutch life.
If this occurs, excessive heat may generate, causing warpage and
damage to the armature and friction material
Heat signs will show, bluing and blackening of surrounding areas from
heat source
F.
o
Rev. #: A
Date: 03/23/12
1200644
Revision Date:14AUG13
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