DSE Model 5520 Automatic Mains Failure Control and Instrumentation System Operators Manual
5520 OPERATING MANUAL ISSUE 1 04/02/05 AM
27
3.6.1 SYNCHROSCOPE OPERATION
(When enabled)
Display
Detail
Hz +2.9
V +0.2
Initial stage of Synchronising display will only show
the difference between the Mains Supply and the
Generator Output. Here the display is showing a
frequency mismatch of +2.9Hz - The genset
frequency is too high and should be reduced
(indicated by the arrow). The voltage is +0.2 volts
high, but is within the limits set for synchronising.
Hz +0.9
V +0.2
Once the difference between the Mains supply and
the Generator output has been reduced the
‘
Synchr
oscope’
di
spl
ay wi
l
l
become act
i
ve.
The
moving bar will roll from left to right or right to left
depending on the mismatch between the Mains
supply and the generator output. The area in the
centre of the scope indicates the set limits for
synchronising to occur.
Hz -0.2
V +0.2
Synchronising will only occur when both the
Frequency and the voltage differences are within
accept
abl
e
l
i
mi
t
s
-
I
ndi
cat
ed
by
‘
Ti
ck’
mar
ks
on
t
he
top of the display. Then the moving bar display will
show the phase difference.
The engine speed
should be adjusted until the moving bar enters the
centre of the scope.
Hz -0.2
V +0.2
Once the Mains and the generator are synchronised
the moving bar will be in the centre of the scope and
module will initiate a breaker close to load the
generator onto the Mains. Should synchronism be
broken the moving bar will pass out of the
synchronising window.