SDMO R44C3 User Manual

LEROY-SOMER
7
2010.11 / f
Installation and maintenance
R438
A.V.R.
- LAM : action eliminated by cutting the ST5
jumper.
2.3.2 - Gradual voltage return function
During load impacts, the function helps the
genset to return to its rated speed faster
thanks to a gradual increase in voltage ac-
cording to the principle:
- If the speed drops between 46 and 50 Hz,
the rated voltage follows a fast gradient as it
is restored.
- If the speed drops below 46 Hz, since the
engine needs more help, the voltage follows
a slow gradient as it returns to the reference
value.
2.4 - Typical effects of the LAM with
a diesel engine with or without a
LAM (U/F only)
2.4.1 - Voltage
2.4.2 - Frequency
2.4.3 - Power
LAM
U
N
0
48 or 57.5 Hz
0.85 UN
Voltage
U/f
50 or 60 Hz
fC
fN
Voltage
ST5 disconnected
ST3
P2
Underspeed and LAM
0
Time
Drop N ≤ 46 Hz
U
Drop N > 46 Hz
U N
0
0,9
0,8
(U/f)
with
LAM
Time
without LAM
1 s 2 s 3 s
Transient voltage drop
0,9
0,8
f N
Max speed drop
0
with
LAM
Time
without
LAM
1 s 2 s 3 s
0
1 s 2 s 3 s
Time
LAM
Variation in the load
Load on the shaft (kW)
Load shedding due to "LAM"
3971 en -
195/202

SDMO R44C3 Specifications

General

Brand	SDMO
Model	R44C3
Category	Inverter
Language	English