16
2016.06 / h
Electric Power Generation
Installation and maintenance
R450
A.V.R.
4531 en -
When the excitation current is set to the
rated value, a voltage dip is observed in
excitation current limit when the
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-
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
Applications
B Volt
Time t
Guaranteed voltage build-up
12 (1A)
1 - 2 s
Parallel operation, de-energized
12 (1A)
1 - 2 s
Parallel operation, at standstill
12 (1A)
5 - 10 s
Frequency starting
12 (1A)
5 - 10 s
Sustained voltage on overload
12 (1A)
5 - 10 s
X2
Z1
X1
Z2
E+
E-
Battery (B Volt)
+
-
t
(400V - 10A)
Exciter field winding
Diode
t
B Volt
Field forcing
Time
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