DATASHEET
R250 AVR
FOR SHUNT ALTERNATORS
CHARACTERISTICS
••Voltage regulation : ± 0.5 %.
••U/F function.
••LAM function.
••Quick response : 500 ms.
••Nominal excitation current : 5A.
••Maximum excitation current :
7A during 10 s.
••Supply range / voltage detection :
85 to 139 V (50/60Hz).
R250 is an analog AVR with power controled by transistors. It is designed for small
alternators with a SHUNT excitation.
••Protection : fuse 8A.
R250 controls the excitation current in order to maintain the output voltage of
the alternator. R250 is performant in terms of voltage regulation, simple to set,
to use and is reliable.
It is in compliance with I.E.C. 60034-1 standard and U.L. 508 / C.S.A. approved.
OPERATION RANGE
LSA 40
42,3
44,3
46,3
47,2
49,3
50,2
51,2
53,1
54
-
-
-
-
SHUNT
-
AREP
-
-
-
-
-
-
-
-
-
-
PMG
-
-
-
-
-
-
-
-
-
-
Operation mode : Standalone
ANALOG AVR R25 0 - REF. 45 4 8 en-2017.11/e
www.leroy-somer.com/epg
MAIN FEATURE
OPERATION CONDITIONS
U/F FUNCTION
••Operating temperature range :
••Vibrations : less than 10 Hz ,
•• Storage temperature range :
••From 10 Hz to 100 Hz : 100 mm/s,
Voltage
Knee
60 Hz
- 40° C to + 65° C.
57 Hz
- 55° C to + 85° C.
Knee
48 Hz
100 %
U/UN
2 mm peak magnitude.
below 100 Hz : 8g.
••Hygrometry : 98%.
••Maximum choc : 9 g on 3 axis.
50 Hz
Frequency
50 Hz
60 Hz
Hz
LAM FUNCTION
Transient voltage drop
with
LAM
LAM
Load on
the shaft (kW)
Max. speed drop
0,9
(U/f)
without LAM
0,8
with LAM
0
1s
0,9
Time
2s
3s
without
LAM
0,8
0
1s
2s
CONNEXION AND SETTING
setting.
3s
R250
110 0V E+ E140 mm
F1
Slow fuse
250V 8 A
P1
Voltage
Stability
KNEE
KNEE
47.5Hz
47.5
Hz
99
LAM
LAM OFF
OFF
SPECIAL
SPECIAL
KNEE
KNEE
65Hz
65Hz
LAM
LAM OFF
OFF
KNEE
KNEE
57Hz
57Hz
LAM
LAM OFF
OFF
88
77
50Hz
50Hz
oo
99 00 11
66
55
LAM
LAM
OFF
OFF
11
13%
13%
22
3
23
2
P2
STAB VOLT
••Potentiometer ST4 : remote voltage
2s
33
44
60Hz
60Hz
25%
25%
FREQ. & L.A.M. CONFIG.
LAM function
1s
0
Time
4 x holes Ø 5.8 x
50 x 115 mm
Settings are done through the AVR.
••Potentiometer P1 : voltage setting.
••Potentiometer P2 : stability setting.
••Strap ST3 : frequency selection.
••Jumper : frequency, U/F function,
Load shedding due to LAM
Time
3s
75 mm
Variation in the load
8
78
7
fN
456
UN
OFF
OFF
13%
13%
25%
25%
LAM
LAM
ST4
Option
External
potentiometer
for voltage adjusting
Frequency selector
50 Hz / 60 Hz , U/F function
and LAM function
© Nidec 2017. The information contained in this brochure is for guidance only and does not form part of any contract. The accuracy cannot be guaranteed as Nidec have an ongoing process of
development and reserve the right to change the specification of their products without notice.