DE-STA-CO MDE Series, Installation Manual

Page: 44 / 62

43
3. Cam is broken (this rarely happens and is an indication of an overload application or a jam)
4. Unit was very heavily overloaded and all bearings loosened up
5. All followers are worn
6. Output shaft to follower wheel connection is loose
7. Customer output member connection loose
a. Tighten output member and dowel in place
Symptom: Indexer is noisy
1. Check if output is backlash-free in dwell
2. Check for excess looseness in motion. Cam or follower could be broken
3. Check for noise from the reducer rather than the indexer
4. Occasionally AC controls can excite the motor and drive to vibrate audibly; change the PWM
carrier frequency to be 12 khz or more
5. Check if input and output connections are backlash free
6. Check if the unit is overloaded
a. Loads can change over a period of time due to wear
7. Check if the unit support (base) is rigid
8. The unit could be overheated and have loose preload.
9. Check if there is sufficient oil in the unit Is oil used consistent with CAMCO specifications?
Symptom: Premature wear of cam followers
1. Actual forces on the unit could be greater than calculated due to loose input or output
2. Lack of oil or wrong oil used (See Lubrication section of Index Drive Service)
3. Frequent or severe overloads
4. Improper input systems (where there is not a constant velocity input) will cause an erratic output or
excessive output vibration; this will result in forces several times higher than calculated (see input
recommendations)
5. Defective cam or follower wheel assembly
Symptom: Output movement is noisy and erratic
1. Input does not run at a constant velocity: The prime objective of a good input connection to an
Index Drive is to maintain a constant shock free velocity (see input recommendations); motor
running too slowly could also cause an erratic output
2. Output connections loose, flexing, or winding up
a. Check all connections (see recommended output connections).
3. Excessive friction drag on output
a. Disconnect indexer and investigate friction torque.