TL;DR
Pan drive faults are usually an overloaded batch, a worn drive belt, or a motor thermal trip. Check the batch weight and drive belt before investigating the motor.
What you might see
- pan drive motor fault alarm on the controller
- pan speed below set-point during coating
- motor thermal protection tripped
- belt slippage noise from the drive enclosure
Likely causes
Batch weight above the rated capacity increasing the drive torque demand
Drive belt worn or stretched reducing torque transmission
Motor thermal overload from elevated ambient temperature or blocked cooling vents
Pan support bearing wear increasing rolling resistance
Required tools
- Torque wrench for belt tensioner
- Replacement drive belt
- Cleaning vacuum for motor vents
- Clamp ammeter for motor current monitoring
Safety first
- The pan holds the tablet batch. Secure the pan before disconnecting the drive belt to prevent unexpected rotation from the batch weight.
- Lock out the pan drive motor before opening the drive enclosure.
Procedure
- 1
Acknowledge the fault and check whether the pan has stopped or is running slowly.
- 2
Verify the batch weight against the machine rated capacity. Remove tablets if the batch is overloaded.[1]
- 3
Reset the motor thermal protection on the motor control panel. Wait 10 minutes before restarting to allow the motor to cool.
- 4
Open the drive enclosure and inspect the belt for wear, cracking, or glazing. Check belt tension and replace the belt if it is worn or stretched beyond the tensioner range.[1]
- 5
Inspect the motor cooling vents for dust or fiber buildup. Clean with a vacuum before restarting.
- 6
Rotate the pan slowly by hand with the drive belt disconnected. Resistance or roughness from the pan support bearing indicates bearing wear.
- 7
Restart the machine at 50% speed and monitor the motor current for 5 minutes before returning to the process speed.
Sources
Glatt Glatt GC / GMPC Tablet Coating Machine general technical documentation, Glatt
Glatt tablet coating machine general pan drive maintenance procedures (general)
More guides for Glatt Glatt GC / GMPC
How to fix poor coating uniformity on a Glatt GC / GMPC tablet coater
Poor coating uniformity is usually an incorrect spray rate, a blocked spray nozzle, or a pan speed outside the optimum range. Check the spray nozzle and pan speed before adjusting the coating formula.
How to fix tablet sticking or picking in a Glatt GC / GMPC tablet coater
Tablet sticking is usually overwetting from too high a spray rate or too low an inlet temperature. Reduce spray rate first, then increase drying air temperature.
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