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LEROY-SOMER
3.4 - Typical effects of the LAM with
a diesel engine with or without a
LAM
(U/F only)
3.4.1 - Voltage
Transient voltage drop
U
N
0,9
with
0,8
LAM
1 s
0
3.4.2 - Frequency
Max speed drop
f
N
0,9
0,8
1 s
0
3.4.3 - Power
Load shedding due to "LAM"
1 s
0
10
Installation and maintenance
R448 & R448 V50
A.V.R.
(U/f)
without LAM
Time
2 s
3 s
with
LAM
without
LAM
Time
2 s
3 s
LAM
Variation in the load
Time
2 s
3 s
3.5 - R448 A.V.R. options
- Current transformer for parallel operation
of....../ 1A Š 2.5 VA CL 1 (See the diagram
in this manual).
- Voltage transformer (adaptation)
- Remote voltage adjustment potentiometer:
470 Ω, 0.5 W min : adjustment range ± 5%
(range
limited
potentiometer P2). Remove ST4 to connect
the potentiometer. (A 1 k Ω potentiometer
can also be used to extend the adjustment
range).
- R 731 module: detection of 200 to 500V 3-
phase voltage, compatible with parallel
operation. Disconnect ST1 to connect the
module;
set
the
potentiometer.
- R 734 module: detection of 3-phase
current and voltage for parallel operation on
unbalanced installations (imbalance > 15%)
- R 726 module: regulation system changed
to "4-function". (See the maintenance
manual and connection diagram.)
• PF regulation ϕ (2F)
• voltage matching before paralleling (3 F)
• mains connection of alternators already
running in parallel (4F)
- R 729 module: same as R 726 with
additional functions
• detection of a diode fault
• 4/20 mA input
• possibility of kVAR regulation
- Control through DC voltage used
monitoring apply to the terminals for
connection of a potentiometer DC voltage :
• internal impedance 1,5 kΩ
• ± 0,5V enable a voltage setting of 10%.
3972 en - 05.2008 / e
by
internal
voltage
voltage
via
the
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