16
2012.03 / e
LEROY-SOMER
Installation and maintenance
R 450
AVRs
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) eld 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) eld
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 eld weakening is used, provide eld
forcing.
4.2.3.3 - R450 eld 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
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