6. Place the COMMON BUS SHOCK LOAD
a. If the SINGLE-PHASE KW meter (9) and
the AC AMPS meter (12) indicate near the
switch (13, fig. 7-63) in the OFF position to stop
l ow e n d o f t h e i r s c a l e s , p l a c e t h e
the test and drop the load. This action also resets
A M M E T E R - WAT T M E T E R R A N G E
the timers if the AC LOAD PROGRAM
SELECTOR switch (8) in the position
SELECTOR switch (5) is in the 5-MIN or the
closest to, but greater than, the load factor
5-SEC position.
applied.
7. After completing the tests of the power plant,
NOTE: The RESISTANCE LOAD SELECTORS
proceed as follows:
3-PHASE KILOWATT toggle switch marked 0-3.5
a. Place the SHOCK LOAD switch (19) in the
must be in the ON position to permit operation of the
OFF position.
VARIABLE 0-3.5 KW control (8, fig. 7-62), and the
R E AC TA N C E L O A D S E L E C T O R 3 - P H A S E
KILOVAR toggle switch marked 0-3 must be in the ON
WARNING
position to permit operation of the VARIABLE 0-3
Always make certain that the power supply to the
KVAR control (11, fig. 7-62).
load bank has been completely cut off (check the
b. If the ac input is providing the power for the
AC-VOLT meter for indications in all three
phases) before disconnecting the power cables.
load bank's control circuits, the indicated
load is greater than selected (approximately
13 amperes per phase greater). Change the
b. Disconnect the power plant from the load
settings of the LOAD SELECTOR toggle
bank or shut down the power plant by
switches (21) as required. Use the
appropriate switching, as described in the
VARIABLE 0-3.5 KW and VARIABLE 0-3
power plant operating manual.
KVAR controls (8 and 11, fig. 7-62) if
needed to obtain the desired load
Normal Shutdown Procedure
indications. Adjust the resistance loading
c o n t r o l s fi r s t t o o b t a i n t h e r e q u i r e d
After all power plant tests have been completed,
single-phase KW indication, then adjust the
proceed as follows:
reactance loading controls to obtain the
1. Place all toggle switches except the CONTROL
r e q u i r e d p ow e r fa c t o r a n d a m p e r a g e
CIRCUIT toggle switch (7, fig. 7-62) in the OFF
indications.
position.
c. The amount of KW or KVAR load may be
2. P l a c e t h e D C A M M E T E R R A N G E
changed at any time by operating the
RESISTANCE LOAD SELECTOR switch
SELECTOR switches (4 and 8, fig. 7-63) in the
( 2 1 ) o r t h e R E A C TA N C E L O A D
2000 A position.
SELECTOR switches (17) or the
3. Place the AMMETER-WATTMETER RANGE
VARIABLE controls.
SELECTOR switch (8, fig. 7-64) in the 160
NOTE: To ensure accurately timed programs, do
KW/1600 A position.
not change the position of the AC LOAD PROGRAM
4. P l a c e t h e D C C O M M O N B U S L O A D
SELECTOR switch (5) unless the SHOCK LOAD
PROGRAM SELECTOR switch (2, fig. 7-63)
switch (19) is in the OFF position.
and the AC LOAD PROGRAM SELECTOR
d. Operation of these controls influences the
switch (5, fig. 7-64) in the CONTINUOUS
indications of the POWER FACTOR meter
position.
(7), the SINGLE-PHASE KW meter (9),
5. Make certain that the VARIABLE 0-55 AMPS
and the AC AMPS meter (12). To obtain the
controls (1 and 4, fig. 7-62) are turned fully
total KVA value, multiply the AC AMPS
meter reading times the SINGLE-PHASE
counterclockwise.
VOLTS (L-N) meter (13) reading with the
6. Allow the fans to operate for 5 minutes to
A M M E T E R - WAT T M E T E R R A N G E
dissipate internal heat from the load bank.
SELECTOR switch (8) placed in each of the
7. Place the CONTROL CIRCUIT switch (7, fig.
three positions. Then, add the three products
and divide the sum by 1,000.
7-62) in the OFF position.
7-65
