Emerson Leroy Somer R450 Installation And Maintenance Manual page 16

Electric Power Generation
When the excitation current is set to the
rated value, a voltage dip is observed in
excitation current
limitation is activated and the current
limit is reached.
4.2.3 - Special type of use
WARNING
The excitation circuit F+, F- must not be
left open when the machine is running:
this will irreparably damage the AVR.
4.2.3.1 - R450 (SHUNT) field weakening
X2
Z1
X1
Z2
E+
E-
The exciter is switched off by disconnecting
the AVR power supply (1 wire - X1 or X2)
Contact rating: 16 A - 250 V A.C.
4.2.3.2 - R450 (AREP/PMG) field
weakening
X2
Z1
X1
Z2
E+
E-
16
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The exciter is switched off by disconnecting
the AVR power supply (1 wire on each
auxiliary winding) - contact rating 16 A -
250 V A.C.
Connection is identical for resetting the AVR
internal protection.
If field weakening is used, provide field
forcing.
4.2.3.3 - R450 field forcing
X2
Z1
X1
Z2
E+
E-
Exciter field winding
Field forcing
B Volt
Applications
Guaranteed voltage build-up
Parallel operation, de-energized
Parallel operation, at standstill
Frequency starting
Sustained voltage on overload
www.genpowerusa.com/leroy-somer-avr/
4531 en - 2016.06 / h
Diode
(400V - 10A)
+
-
t
Battery (B Volt)
t
Time
B Volt Time t
12 (1A) 1 - 2 s
12 (1A) 1 - 2 s
12 (1A) 5 - 10 s
12 (1A) 5 - 10 s
12 (1A) 5 - 10 s
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