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EA125-8
3
SECTION 2 : DIP SWITCH ADJUSTMENT (SW)
2.1 SW1 Voltage Selection
SW1 is to select the suitable genset sensing input
voltage (S1, S2). When sensing input is 440 Vac (380
480) Switch the SW1 to ON. If the sensing input is 220
Vac please switch SW1 to off position. (Please
Reference from Figure 2).
ATTENTION
If system voltage is 220V but the SW1 is setting at
“ON” (440V) then it will cause genset over voltage
and sever damage.
SW
1
2
3
4
5
6
ON
SW
Figure 2 DIP Switch (SW)
2.2 SW2 C.T. Current Compensation
SW2 is to select the suitable C.T. Current transformer
current input ( C1, C2 ) If C.T. Current is 5A then
please switch SW2 to ON. If C.T. Current is 1A then
please switch SW2 to OFF position.
2.3 SW3 Frequency Selection
If genset rated frequency is 60 Hz please switch SW3
to ON position and switch to OFF position is rated
frequency is 50 Hz.
ATTENTION
If the frequency 60 Hz is selected while the
generator rated frequency is 50 Hz then it may
result in under voltage. If a 60 Hz generator is
selected at 50 Hz, when executing engine stop,
the over excitation current may damage then AVR
and generator.
2.4 SW4, 5, 6 Genset Capacity Selection
If genset capacity is below 90 KW please switch SW4,
5, 6 to OFF position.
If capacity is 90
200 KW please switch SW4 to ON
position and 5, 6 remain in OFF position.
If capacity is greater than 200 KW please switch SW4,
5, 6 to ON position.
ATTENTION
Each time when SW4, 5, 6 position is changed,
the STAB (stability) must be readjusted to
achieve the optimum genset performance. The
setting of the DIP switches SW must be
conducted while the generator is not in
operation.
3. ADJUSTMENT
3.1 VOLT
● Voltage setting adjusting the genset rated output
voltage.
● When SW1 is “OFF” (220V) adjustable range is 175
270 Vac.
● When SW1 is “ON” (440V) adjustable range is 350
540 Vac.
ATTENTION
AVR AC voltage readings are all average value.
● External VR
：
Connect 1K ohm 0.5W VR to the VR
terminal, the adjustable voltage range = +/- 5%Un,
3K ohms 0.5W adjustable voltage range = +/-
10%Un.
● If this function is not required, please short circuit the
two terminals.
3.2 STAB
Stability adjustment. Correct stability adjustment must
be conducted while the generator is operating without
load, firstly adjust the STAB potentiometer (POT)
clockwise until voltage becomes unstable, and then
slightly adjust anti-clockwise. (approximately 1/5 of
rotation). When the voltage just reaches the critical
point (knee point) of stabilization. Where the voltage is
stable yet very close to become unstable.
3.3 U/F
Under
frequency
protection
adjustment.
When
generator frequency falls below the knee point, the
under frequency protection circuit will begin to
intervene and voltage and frequency begin to decrease
in linear descend. Coordinate with the DIP switch SW3
frequency selection 50/60 Hz.
When selecting 50 Hz the adjustable range is from 42
to 50Hz and the factory presets at 45 Hz.
When selecting 60 Hz the adjustable range is from 51
to 60Hz and the factory presets at 55 Hz.
