LiftMaster RSL12U RSL12U Troubleshooting Guide Manual - Page 7

Capacitor (for Ac Operators), Symptom, Check The Capacitor, Solution

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BASIC TROUBLESHOOTING To protect against fire and electrocution: • DISCONNECT power (AC or solar and battery) BEFORE installing or servicing operator. CAPACITOR (FOR AC OPERATORS) SYMPTOM: A bad capacitor will cause a motor to hum when trying to run, or stall while it is running. CHECK THE CAPACITOR: 1 2 3 Disconnect ALL power from operator. IMPORTANT: Discharge the capacitor BEFORE touching it! Discharge the capacitor by touching a screwdriver across the capacitor terminals (make sure to hold the insulated end of the screwdriver when doing this). You may see a small spark when discharging the capacitor, this is normal. Visually inspect the capacitor for any burn marks, bubbling or oil leakage. This is a good indication of a bad capacitor. Using a multi-meter, measure the capacitance between the capacitor contacts. The measurement on the meter should be within 10% of the uF rating on the label. SOLUTION: If the capacitor measures less than 90% of the rating, it should be replaced. 6

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6
BASIC TROUBLESHOOTING
CAPACITOR (FOR AC OPERATORS)
SYMPTOM:
A bad capacitor will cause a motor to hum when trying to run, or stall while it is running.
CHECK THE CAPACITOR:
To protect against fire and electrocution:
•
DISCONNECT power (AC or solar and battery) BEFORE installing or servicing operator.
1
Disconnect ALL power from operator.
2
3
IMPORTANT:
Discharge the capacitor BEFORE
touching it!
Discharge the capacitor by touching a
screwdriver across the capacitor terminals
(make sure to hold the insulated end of the
screwdriver when doing this). You may see a
small spark when discharging the capacitor,
this is normal.
Visually inspect the capacitor for any burn
marks, bubbling or oil leakage. This is a good
indication of a bad capacitor.
Using a multi-meter, measure the capacitance
between the capacitor contacts. The
measurement on the meter should be within
10% of the uF rating on the label.
SOLUTION:
If the capacitor measures less than 90% of the rating, it should be replaced.