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EA350
5
3.2 Preliminary Setup
Complete the following steps before proceeding with
system start-up.
● Verify that the Regulator specifications conform
with the requirements of the generator system.
● Ensure that the controller jumpers and dip sw are
installed/positioned as follows.
1. If a remote voltage-adjust rheostat will not be
used, ensure that the Voltage Adjust Rheostat
Jumper is connected across terminals 6 and 7.
2. If a 55 hertz corner frequency for a 60 hertz
system is desired, connect the Corner Frequency
Jumper to the 60 Hz terminal. If a 45 hertz corner
frequency for a 50 hertz system is desired,
connect the Corner Frequency Jumper to the 50
Hz terminal.
● Ensure that the connection between the
generator system and the Regulator are correct.
● Set the regulator voltage control potentiometer
fully counter-clockwise and the remote voltage
adjust rheostat (if used) to the centered position.
● Adjust the regulator stability control potentiometer
fully clockwise. This provides the most stability
and the slowest response.
● If user-adjustment of the under frequency control
potentiometer is required, start with the
potentiometer
adjusted
to
the
fully
counterclockwise position. Then, slowly adjust
the potentiometer clockwise to set.
3.3 System Start-Up
● Perform the steps under Preliminary Setup.
NOTE :
All AC voltage readings are to be taken with an
“ average ” reading voltmeter.
● Start Prime-mover and bring up to rated speed.
● Generator voltage should build up. If it does not
build up, perform the steps under Field Flashing.
● Slowly adjust the regulator voltage control
potentiometer (or remote voltage adjust rheostat)
until the generator voltage reaches the nominal
level. If the voltage does not build up to the rated
level :
1. Check the generator output for excessive load or
a short circuit.
2. If a minimal residual of 5 volts is not present,
perform the steps under Field Flashing.
● Apply and remove the generator load to verify
stability If the generator responds too slowly or
hunts (oscillates):
● Check the generator output for excessive load or
a short circuit. Adjust the Regulator stability
control with no load applied.
● Check the stability of the governor system.
● Check regulation under normal operating
conditions. If the regulation is poor:
1. Verify that the prime mover is operating at rated
speed.
2. Verify that the voltmeter is connected to the same
point as the Regulator sensing.
3. Use an average-sensing voltmeter (not an
rms-sensing voltmeter).
● Verify the corner frequency setting by slowly
reducing the generator frequency until the
generator output voltage just starts to decrease.
If adjustment of the corner frequency is required:
1. Rotate the under frequency control fully
counterclockwise.
2. Reduce the generator frequency from nominal
(either 50Hz or 60Hz) to the desired corner
frequency.
3. Slowly adjust the under frequency control
clockwise until the generator output voltage just
starts to decrease.
CAUTION :
All voltage readings are to be taken with an
average-reading
voltmeter
Meggers
and
high-potential test equipment must not be used. Use
of
such
equipment
could
damage
the
semiconductors contained in the controller.
4. FIELD FLASHING
When the regulator is operated with the generator
for the first time, the polarity of residual magnetism
may be reversed or too small to achieve the
necessary build-up voltage for the regulator. If
reversing the field connections does not induce
build-up, and the residual voltage is less than the
specified value of 5 VAC, shut down the
Prime-mover and proceed with the following steps :
1. With the Prime-
mover at rest and the regulator’s
field output wires disconnected, apply a DC
source ( NOT grounded ) of no more than 6~12
Vdc with Positive to F+ and Negative to F-, in
series with a current-limiting resistor of 3~5 ohms
20 watt. (The set battery is a suitable source.)
