Brush Replacement - Masterflex Digi-Staltic L/S 77310-00 Manual De Operación

BRUSH REPLACEMENT

Exact motor brush and commutator life will depend on duty cycle and motor operating speed. Inspect the brushes every
six months or after 2000 hours of operation, whichever occurs first. Replace brushes if they are less than 0.3 in (7.6 mm)
long. Inspect the commutator when the brushes are replaced, and clean if necessary.
DANGER: Never remove the cover from the pump drive when power is present. AC and DC power in the pump
drive can cause serious injury or death. Ensure that the pump drive is disconnected from the
power source before removing the cover for maintenance. Allow ten minutes for the capacitors in
the power supply to discharge before proceeding.
1. Refer to BELT REPLACEMENT, remove the cover, and remove the belt from the pulley on the drive motor.
2. Pivot the motor away from the pump to gain access to the brush on the pump side of the motor.
3. Refer to Figure 15, and remove the brush caps.
4. Rotate each brush retainer so it lines up with the groove in the brush holder. Remove the brushes.
5. Measure the length of the brushes. If either brush is less than 0.3 in (7.6 mm) long, they both need to be replaced.
Always replace them in pairs.
CAUTION: Excessive commutator wear or "bridging" between commutator segments can cause excessive
current through the controller circuit and damage to the dispenser.
6. Inspect the commutator for wear and dirt. If the commutator segments are worn, replace the motor. If there are dark
tracks where the brushes contact the commutator, clean with isopropyl alcohol.
7. Install the brushes into the brush holders and rotate the retainer to secure the brushes. Reinstall the brush caps.
8. When the motor has been reassembled, refer to step 7 of BELT REPLACEMENT to reassemble the pump drive.
Figure 15. Inspecting and Replacing Brushes
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