OM-189 507 Page 16
5-6.
Safety Interlock Switch And Measuring Tuning Capacitor Voltage
Ref. 802 663
1
Tuning Capacitor Cover
The cover prevents exposure of the
tuning capacitors on the unit.
2
Safety Interlock Switch
(Behind Cover)
The safety interlock switch
prevents the contactor from
energizing with the cover open.
To measure capacitor voltage, turn
off power source and disconnect
input power.
Open tuning capacitor cover.
3
Tuning Capacitor Assembly
4
Voltmeter
Measure voltage across busbars
every 30 seconds until voltage is
near 0 (zero) volts.
Proceed with job near tuning
capacitor assembly. Close and
secure cover when finished.
Tools Needed:
5/16 in
1
2
4
3
Significant DC voltage can remain on
capacitors after unit is Off. Always
check capacitors as shown to be sure
they have discharged before working
on unit.
5-7.
Measuring Input Capacitor Voltage
800 998-C
Turn Off power source and
disconnect input power.
Remove wrapper.
1
Input Capacitor C1
2
Input Capacitor C2
3
Voltmeter
Check input capacitor(s).
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.
Tools Needed:
5/16 in
3
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
