14
2016.06 / h
Electric Power Generation
Installation and maintenance
R450
A.V.R.
4531 en -
4 - INSTALLATION - COMMISSIONING
4.1 - Electrical checks on the AVR
- Check that all connections have been
made properly as shown in the attached
wiring diagram.
- Check the rotating switches selections
- frequency,
- type of alternator,
- normal position (response time),
- external potentiometer,
- rated voltage,
- secondary current of the CT used,
- type of excitation.
- R450 optional operating modes
4.2 - Setting up
The various adjustments during tests
must be made by a qualified engineer. It
is essential that the drive speed
specified on the nameplate is reached
before commencing adjustment. After
operational testing, replace all access
panels or covers.
The AVR is used to make any
adjustments to the machine.
4.2.1 - Setting up the R450
Before using the AVR, make sure that
the rotating switches have been
correctly configured with AREP/SHUNT
or PMG excitation
a)
Initial potentiometer settings (see table
below)
Action Factory setting Pot.
P1
P2
P3
P4
10 A
maximum
400 V - 50 Hz
Not set
(centre position)
Not set
(fully
anti-clockwise)
Excitation ceiling
- Factory-sealed
Voltage quadrature droop
(// operation with C.T.)
- 0 quadrature droop fully
anti-clockwise
Voltage
minimum fully
anti-clockwise
Stability
Stability adjustments in standalone
operation
b)
Install a D.C. analogue voltmeter (needle
dial) cal. 100 V on terminals F+, F- and an
A.C. voltmeter cal. 300 - 500 or 1000 V on
the alternator output terminals.
c
)
Check the rotating switch selection.
d)
Voltage potentiometer P1 at minimum,
fully anti-clockwise.
e
) Stability potentiometer P2 around 1/3 in
from the anti-clockwise stop.
f
) Start the engine and set its speed to a
frequency of 48 Hz for 50 Hz, or 58 for
60 Hz.
g
) Set the output voltage to the desired
value using P1.
- Rated voltage U
N
for solo operation
(eg. 400 V)
- Or U
N
+ 2 to 4% for parallel operation with
C.T. (eg. 410 V -)
If the voltage oscillates, use P2 to make
adjustments (try both directions), observing
the voltage between F+ and F- (approx.
10 V D.C.). The best response time is
obtained at the limit of the instability. If no
stable position can be obtained, try selecting
the fast position.
h
) Check LAM operation: depending on the
rotating switch selection.
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