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4
EA440
Figure 4
Manual Field Flash
3.4
Trim Adjustment
An auxiliary input is provided to connect to A1, A2. It is
designed to accept DC +/- 5V.Turn the TRIM trimmer
fully anticlockwise has no effect, Clockwise it has
maximum effect.
SECTION 4 : FIELD FLASHING
When the regulator is installed correctly but the
generator is failed to generate power. Besides carbon
brushes were worn out, here are two possible causes
below.
4.1
The polarity of field is inverse
Solution
：
Exchange the connection of F+ and F-.
4.2
The residual voltage is less than 5 Vac,
Solution 1
：
4.2.1 Shut down generator, disconnect the wiring
between AVR and generator then flash the field.
Flashing duration = 3 seconds. (See wiring in
Figure 4)
Resistor 3
– 5 ohms for full wave AVR
Resistor 5
– 10 ohms for half wave AVR
Warning
!!
Over field flashing may damage
the field winding of generator.
4.2.2 Restart generator and measure the residual
voltage by AC Voltmeter, if it is still less than 5
Vac, repeat the previous process, after several
times, the residual voltage still cannot be built,
Kutai EB500 is strongly recommended, see
Figure 4.
Field
SW
R
-
+
V
F+
F-
BATT.
~
G
~
T
S
R
WARNING
Overly field flashing may damage the AVR or
generator excitation winding.
Please make sure you have read and understand
the contents of the instruction manual prior to
installation. Incorrect wiring connection may
result in irreversible damage to the product and
other equipments.
SECTION 5 : PARALLEL FUNCTION
5.1
Parallel Compensation
5.1.1 When it is required to operate the regulator in
parallel with an isolated or utility bus, in addition
to the regulator provisions, a 10VA current
transformer (CT) is required ( See Figure 3 ). The
CT is connected in a generator line and should
deliver from 1 amperes secondary current at
rated load.
5.1.2 The phase relationship of CT signal to the
regulator sensing voltage must be correct or the
system will not parallel properly. The CT must be
installed in the line of the three phase generator
that does not supply sensing to the regulator.
5.2
Reactive Droop Compensation
5.2.1 For reactive droop compensation, connect the
CT to it’s respective regulator as shown on
Figures 3.
5.2.2 A unit-parallel switch shorts the parallel CT
secondary to prevent any droop signal from
being injected into the regulating system during
single unit operation. The switch may not be
required
on
parallel
droop
compensation
applications where a voltage drop is not
objectionable.
