Figure 6-7. AC Output Control Box Test Setup
(12) Output Control Box Housing (24, figure
6-9). Inspect output control box housing for physical
damage. Check that all hinges, covers, and latches
operate properly. Check that all nameplates are in
place. Check that side access cover is always in place
when box is not being actively serviced.
(1) Reconnection Switch (S6) (1, figure 6-10). Tag
and disconnect electrical connections except jumper
wires from reconnection switch. Using an ohmmeter
check for continuity between terminals listed in table
6-5 for each of the three switch positions. If continui-
ty is not found for each pair of terminals listed, replace
reconnection switch. If continuity is found between
any other terminals switch should be replaced.
(2) AC Circuit Breaker (CB1). Test that breaker
will remain in both the ON and OFF positions.
(3) 15 Amp Circuit Breaker (CB3). Test that
breaker will remain in both the set (pushed) and trip-
ped (pulled) positions.
(4) Convenience Receptacle (J14). With 15 amp
circuit breaker in proper operating position, test con-
venience receptacle using a 120 volt trouble light or
voltmeter. With the unit operating and the 15 amp cir-
cuit breaker pushed in, 120 volts should be present at
(5) Linear Reactor (L1). Disconnect electrical
connectors from control box. Use an ohmmeter to
check resistance of each of the three windings in the
reactor by checking resistance between terminals 1 and
2,3 and 4,5 and 6. Resistance for each winding must
be 13.5 ohms plus or minus 1.35, if not replace reactor.
(6) Connector Assemblies. Test for continuity
between each pin and case for shorts to ground.
(7) Current Voltage Transformer (CVT1). Using
an ohmmeter check three primary windings of
transformer (figure 1-1, 6-7.1 and 6, figure 6-9) by
measuring resistance from terminals H1 to H2, H3 to
H4, H5 to H6, Resistance must be 2.27 ohms ± O.227
ohms. Check resistance in three secondary windings
of transformer by checking from terminals X1 to X2,
X1 to X3, X2 to X3. Resistance must be 1.68 ohms
±0.168 ohms. Check resistance in control windings by
checking from terminals C1 to C2. Resistance must be
9.6 ohms ± 0.96 ohms. If any of the windings do not
show the proper resistance, replace transformer.
(8) Current Transformer (CT1). On the current
transformer (figures 1-1, 6-7.1 and 7, figure 6-9) only
the secondary windings can be checked. Using an
ohmmeter check resistance in secondary windings by
checking from terminals 1A to 2A, 1B to 2B, 1C to 2C.
Resistance must be 0.5 ohms ±0.05 ohms. If any of
the windings do not show the proper resistance,
(9) Bridge Rectifier Assembly (A4) (see figure
6-11 ). Tag and remove leads to terminal board and to
each diode (3) separately by checking between ter-
minals (6) shown in table 6-6. Resistance in one direc-
tion should be very high in one direction and very low
in the other. Measure resistance of R1 (4). It should
be 56 ohms.