3-105. AC Voltmeter Replacement.
See (42, fig. 3-18) and replace the ac voltmeter as
follows:
CAUTION
Open DC CONTROL CIRCUIT
BREAKER before testing or
replacing the ac voltmeter.
a . Testing.
(1) Gain access to rear of control cubicle
panel (96).
(2) Connect multimeter with appropriate ac
voltmeter connections across ac voltmeter terminals.
(3) Perform preparation for starting proced-
ure (fig. 2-6) and zero ac voltmeter with front panel
VOLTAGE ADJUST control.
(4) Perform starting procedure (fig. 2-7) steps
1 through 4.
(5) Check that readings on multimeter and ac
voltmeter do not differ by a voltage greater than that
listed below for each setting of the AMPS-VOLTS
selector switch.
(a) 240/416 V operation.
AMPS -VOLTS setting
Voltage Difference
L1-L2 . . . . . . . . . . . . . . . ...34 V
L1-L0 . . . . . . . . . . . . . . . ...22 V
(b) 120/208 V operation.
AMPS -VOLTS setting
Voltage Difference
L1-L2 . . . . . . . . . . . . . . . ...21 V
L1-L0 . . . . . . . . . . . . . . . ...11 V
(6) If voltage differences, greater than those
specified above are obtained, the ac voltmeter is
faulty and must be replaced. Faulty ac voltmeter
must be forwarded to higher maintenance level for
repair.
(7) Stop engine generator (fig. 2-8).
(8) Disconnect multimeter and secure control
cubicle panel.
b . Removal.
(1) Gain access to rear of control cubicle
panel (96).
(2) Tag and remove ac voltmeter (42) leads.
(3) Remove screws (40) and nuts (41) which
secure ac voltmeter and remove ac voltmeter.
c.
Installation. Install replacement ac voltmeter
using removal steps in reverse order. Remove tags.
3-106. Kilowatt Met er Replacement.
See (39, fig. 3-18) and replace the kilowatt meter as
follows:
a. Removal.
(1) Gain access to rear of control cubicle
panel (96).
(2) Tag and remove kilowatt meter (39) leads.
(3) Remove three screws and nuts which secure
kilowatt meter and remove kilowatt meter.
b. Installation.
Install replacement kilowatt
meter using removal steps in reverse order. Remove
tags.
3-107. Watt meter Converter Inspection and Replace -
ment.
See (102, fig. 3-18) and proceed as follows:
a. Inspection. Gain access to interior of control
cubicle and inspect wattmeter converter for signs of
corrosion, loose mounting, loose electrical connec-
t ions, or evidence of damage.
b. Removal.
(1) Gain access to rear of control cubicle
panel (96).
(2) Tag and remove electrical leads.
(3) Remove screws (100) and nuts (101) which
secure wattmeter converter (102) and remove watt-
meter converter.
c. Installation. Install replacement wattmeter
converter (102) using removal steps in reverse
order. Remove tags.
3-108. AC Ammeter Replacement,
See (8, fig. 3-18) and replace the ac ammeter (8) as
follows:
a. Removal.
(1) Gain access to rear of control cubicle
panel (96).
(2) Tag and remove ac ammeter leads.
(3) Remove three screws and nuts which secure
ac ammeter (8) and remove ac ammeter.
b. Installation.
Install replacement ac am-
m e t e r ( 8 ) r e m o v a l s t e p s i n r e v e r s e o r d e r .
Remove tags.
3-39