position, starting with L1 -L2 (volts), and rotateAMPS-VOLTS selector switch clockwise a stepata time.The circuit for the L1 -L2 position is illus -trated in f i g u r e 3 - 2 1 .As the selector switch isrotated clockwise (CW), the contacts rotate CW asshown.(3)Install leads as kwged and remove tags.b. Replacement. Replace defective AMPS-VOLTSsel;ctor switch (48)as follows:(1) Removal.(a) Tag AMPS-VOLTS selector switch (48)leads and~emove screwsandlockwashers whichsecure the leads to the AMPS-VOLTS switch.(b) Remove knob (43)and hardware whichsecure AMPS-VOLTS selector switch (48) to panel(96)and remove switch.(2) Installation. Install AMPS-VOLTS selectorswitch (48) using removal steps in reverse orderandremove3 - 1 1 3 .See ( 6 6 ,tags.P a n e l L i g h t S w i t c h .f i g . 3 - 1 8 ) and proceed as follows:CAUTIONa.—panelOpen DC CONTROL CIRCUITBREAKER ( 2 7 , f i g . 3 - 1 7 ) be-fore testing or replacingPANEL LIGHT switch.i esting.(1) Gain access to rear of control cubicle( 9 6 , f i g . 3 - 1 8 ) .(2) Remove screw that secures one of the leadsto PANE!.LIGHT switch (66).(3) With an ohmmeter test PANEL LIGHTswitch for continuity in ON position.(4) Test PANEL LIGHT switch for opencon-tacts no continuityin OFF position.(5) Reconnect lead to PANEL LIGHT switch.~. Replacement.Replace defective PANELLIGHT switch (66)as follows:(1) Removal.(~) Tag PANEL LIGHT switch leads and re-move screws and lockwashers which secure leads toswitch.(Q)Remove mounting hardware which sec-uresPANEL LIGHT switch to panel and removeswitch.(2) Installation.Install PANEL LIGHT switch(66) usin~ removal steps in reverse order and removetags.3 - 1 1 4 . V o l t a g e S e n s i n g S w i t c h , L o c a l - R e m o t e .See ( 6 7 , f i g . 3 - 1 8 ) andproceed as follows:CAUTIONOpen DC CONTROL CIRCUITBREAKER ( 2 7 , f i g u r e 3 - 1 7 )before testing or replaciqqVOLTAGE SENSING switch.a. Testing..(1) Gain access to rear of control cubiclepanel ( 9 6 , f i g . 3 - 1 8 ) .(2) Tag all VOLTAGE SENSING switch (67)leads.(3) Remove screws and lockwasherswhichsecure tagged leads to VOLTAGE SENSING switch.(4)Place VOLTAGE SENSINGswitch to RE-MOTE position.With an ohmmeter, test for contin-uity, (closed contacts) from center contacts to upPerCOIltaC&.NOT EUpper contacts are those closestto panel hinge.(5) Place VOLTAGE SENSINGswitch in LOCALposition,Test for continuity (closed contacts) fromcenter contacts to lower contacts.(6) If the VOLTAGE SENSINGswitch does notoperate correctly replace it.(7) Reconnect leads, as tag~ecf, and removetags.b. Replacement.Replace VOLTAGE SENSINGswi~ch (67)as follows:(1] Removal.(a) Tag VOLTAGE SENSING switch leads andremove screws and lockwasherswhich secure leads tothe VOLTAGE SENSING switch.(~) Remove mounting hardware which securesVOLTAGE SENSINGswitch to panel (96)and removeswitch.(2) Installation.Install VOLTAGE SENSINGswitch (67) using removal steps in reverse order.Remove tags.3 - 4 1
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