5-7. Measuring Input Capacitor Voltage
Y Significant DC voltage can remain on capacitors after unit is Off. Always check ALL capacitors as shown to be sure they have discharged before working on unit.
1 2 3 4
5
Tools Needed:
3/8 in
Turn Off power source and disconnect input power.
Remove wrapper.
1Input Capacitor C2
2Input Capacitor C1
3Input Capacitor C4
4Input Capacitor C3
5Voltmeter
Check input capacitors.
Measure the dc voltage across the positive (+) and negative (−) terminals every 30 seconds until voltage is near 0 (zero) volts.
Proceed with job inside unit. Reinstall wrapper when finished.
Ref.