2012.03 / e
LEROY-SOMER
9
Installation and maintenance
R 450
AVRs
4531 en -
WARNING
The limitation threshold must be
adjustable between 1 and 5.5 A. The
genset breaker must be open during the
short circuit. If the genset is restarted in
short circuit, there is a excitation build
up during 10s again at the maximum
value.
Operation between 3 and 6 In when
short-circuited:
The excitation current ceiling during a
short-circuit equals 2.9 times the xed
threshold when setting the permitted
excitation ceiling in continuous operation.
When the threshold is exceeded for a period
= 10 s the current is reduced to a value
between 0.5 and 0.7 A (shutdown).
In all operating conditions the maximum
excitation current must be limited to
9 A ± 0.5 A.
Overrun indications:
One green LED:
- Lights up when the excitation current is
below the continuous operation threshold
It signals the AVR normal operation.
- Turns off when the excitation current ceiling
used to obtain short-circuit operation is
reached and when the excitation current is
reduced to the shutdown value.
- Flashes when the over excitation counter
is decrementing.
NB: After an obvious short-circuit, the
voltage is limited to 70% of the rated voltage.
This avoids overvoltages on machines
whose no-load excitation current is below
the “lower current” threshold (only in AREP).
P3
Diagram 1
9.5
I exc(A)
(Maximum current I exc)
Decrease of
90 s tempo.
Activation of
90 s tempo.
Activation of
90 s tempo.
Red led
Green led
Activation of
10 s tempo.
10s tempo. elapsed :
shutdown apllication
t(s)
2.9x I threshold
(max. 9.5 A)
I
threshold
(1...5.5A)
Shutdown
0.5 ~ 0.7
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