2012.03 / e
LEROY-SOMER
13
Installation and maintenance
R 450
AVRs
4531 en -
3.4.3 - Power
3.5 - AVR options
- Current transformer for parallel opera-
tion of....../1 A or 5 A according to the po-
tentiometer P4 position.
- Voltage transformer (adaptation)
- Remote voltage adjustment potentio-
meter.
For a range of variation:
± 5% : 470 Ω
± 10% : 1 kΩ
the power of the potentiometer can be
0.5 W, 2 W or 3 W.
The potentiometer input must be
isolated. Do not connect it to the ground.
- R 731 module: 3-phase voltage sensing
200 to 500 V, compatible with parallel
operation in balanced installations.
- R 734 module: 3-phase current and
voltage sensing for parallel operation on
unbalanced installations (unbalance >
15%).
- R 726 module: regulation system
changed to “4 - function” (see the
maintenance manual and connection
diagram).
• PF regulation (2F) .
• Equalization of voltages before
paralleling (3 F).
• Possibility of coupling to the mains of
alternators already running in parallel (4F).
- R729 module: same as R726 with
additional functions.
• Detection of a diode fault.
• 4-20 mA input.
• Possibility of kVAR regulation.
-
Voltage control: with an isolated
D.C. current source applied to the terminals
used for the external potentiometer:
• Internal impedance 1.5 kΩ.
• A variation of ± 0.5 V corresponds to a
voltage adjustment of ± 10%.
0
1 s 2 s 3 s
Time
LAM
Variation in the load
Load on the
shaft (kW)
Load shedding due to LAM
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