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Hold 15 sec.to
start the engine
generator and to
transfer the load
to emergency.
Press to cancel the
active exercise period
(stops engine now or
after cooldown) See
page 5–1.
Hold 5 sec
.toset
20 min. engine exercise
period immediately (engine
starts) and weekly thereafter.
· blinks slowly when
button is released (set)
and during 20 min.
exercise period.
· blinks rapidly when
button is held 5 sec.
while being set
lights show position of transfer switch
lights show the sources available
light for built–in
engine exercise timer
Seepage5–1
for complete
instructions
PressuntillightFLASHES
Pressfor15Seconds
Florh am Park NJ 07932 U SA
TRANSFER SWITCH TEST BYPASS TIMEDELAY SETENGINEEXERCISER
Figure 2–1. Membrane controls and indicator lights.
· stays on after engine
stops (exerciser is
enabled for weekly
operation)
SECTION 2 SEQUENCE OF OPERATION
2-- 1
Transfer To Emergency
Thesequenceforloadtransferto
emerg en cy sourc e begins autom ati-
cally when normal source voltage
falls below the preset dropout point
or when Transfer Switch Test b utton
is pressed. An under voltage condi-
tion on any phase of the normal
source is detected by the sensor.
Whe n the n or ma l
sour c e voltag e fail s or
the Transf e r Swi tch Test
button is pressed, the
SE r el ay d e-energ iz es
and rel ay NR beg ins its
timi n g cy cle (1 o r 3
seconds, moment ar y
normal source outage
delay). The NR rel ay is prov id ed with a time del ay on
dropout to override momentary outages and prevent
nuisance starting of the engine-driven generator. If the
normal source voltage returns above the sensor dropout
setting be fore the time delay expire s, the NR relay tim ing
cyc l e is reset to z ero and relay SE ener g izes .
If the normal sourc e voltage does not return above the
sensor dropou t setting before the time del ay expires, the
NR relay de-ener g izes and signal s the engine-d riven
gen erator t o s tar t. At th e s am e tim e, a v oltag e and
frequenc y sensor beg ins monitoring the emerg enc y sour c e.
The sensor will accept the emergency source only when
both
vol tag e and frequen c y reach preset pickup points.
Usually about ten seconds elapse from dropout of the NR
relay to acceptance by the sensor. This time span occurs
bec ause the eng ine-d riven g en erator m u st cr ank, start, and
run up to nominal pic ku p points . Fo r this re aso n, if the
Tran sf e r S w i tch Test buttonispresseditmustbeheldfor15
seconds. If the emergency source is available immediately,
the senso r m ay ac c ept it as soon as N R relay drops out.
When the emergency source is accepted by the sensor,
relay ER begins i ts timing cycle (transfer to emergency
delay). ER relay is provided with an adjustable (0 to 5
minutes) time delay on pickup to delay transfer of the
load to the emergency source. For immediate transfer
press Bypass Time Delay button.
ER relay energizes, the TS coil is energized, the transfer
switch operates, and all switch contacts (mains, controls,
auxiliaries) reverse position. The transfer switch is now
supplying the load from the emergency source.
The transfer swit ch will remain in the Emergency
positi on until the normal source is rest ored. If the
Transfer Switch Terst button is used, the transfer switch
will remain on emergency until the retransfer to normal
delay times out.
Retransfer to Normal
The sequence for load retransfer to the normal source
automatically begins when the voltage sensor detects
restoration of the normal source. The voltage level must
rise above the preset pickup point on all phases before
the sensor will accept the normal source.
Whenthenormalsourceisacceptedbythesensor,relay
SE begins its timing cycle (adjustable 1 sec. to 30 min.,
retransfer to normal delay). For immediate retransfer
press Bypass Time Delay button. SE relay is provided with
a time delay on pickup to prevent immediate load
retransfer to the normal source. The delay insures that
the normal source has stabilized before reconnection of
vital loads. If the normal source voltage falls below the
present dropout point before the time delay expires, the
timing cycle is reset to zero. If the emergency source fails
for more than 4 seconds during the timing cycle, ER relay
drops out and the load is immediately retransferred to
the normal source, if that source is acceptable.
SE relay energizes and ER relay is dropped out. The TS
coil is energized, the transfer switch operates, and all
switch contacts (mains, controls, auxiliaries) reverse
position. The transfer switch is now supplying the load
from the normal source again.
Upon retransfer to the normalsource, NR relay begins its
timing cycle (unloaded running delay [engine cooldown] ).
NRrelay is provided witha 5 minute timedelay on pickup
to keep the engine running for a cool-down period.
NR relay energizes after the time delay and signals the
engine-driven generator to shut down. All circuits are
reset for any future normal source failure.
Activation of standard control features s hown in S ection 5
will alter the sequence o f operation a nd introduce
addition al time delays during tr ansfer o per ation s .