ToughTek CM40, CM40 Silo Troubleshooting Advice | Graco

Frequently Asked Questions

Mixed material is too dry.

Water flow meter setting is too low.

Increase the water flow meter control setting to increase the water added to the material.

Water insert slot is plugged.

Clean out the obstruction.

Water feed pressure is too low.

Find a suitable water source that provides adequate pressure.
- The water feed must be able to supply water pressure of 40 psi or greater or else the mixer will not operate in the forward direction. A pressure switch that controls the forward direction operation of the mixer activates at 40 psi, allowing for forward operation. If water pressure is below 40 psi and the mixer must be operated in the forward direction, the pressure switch can be bypassed by connecting the water pressure bypass plug.

Mixed material is too wet.

Water flow meter setting is too high.

Decrease the water flow meter control setting to decrease the water added to the material.

Dry material in the hopper/silo is running low.

Add more material to the hopper or silo.

Electric motor will not start or stops during operation.

Loose connections.

Check connections in electrical enclosure.
Check for correct voltage supply at the disconnect and VFD terminals L1, L2, L3.

Motor overload relay trips.

Turn power disconnect switch to OFF and wait one minute for VFD to reset.
Allow the motor to cool if conditions occur frequently.
See “VFD overload fault” section for possible causes.

VFD overload fault.

The VFD detects a motor overload due to motor slowing down under a high current condition.

Reduce motor load.
Lower pressure.
Reduce length and/or increase diameter of hose.

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