SDMO R570U, User And Maintenance Manual

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8
2012.03 / e
LEROY-SOMER
Installation and maintenance
R 450
AVRs
4531 en -
3 - TECHNICAL CHARACTERISTICS
3.1 - Electrical characteristics
- maximum power supply: 150V - 50/60 Hz
- Rated overload current: 10 A - 10 s
- Electronic protection:
- In the case of a short-circuit, the excitation
current is reduced to a value less than 1A
after 10 s
- In the event of loss of voltage reference,
the excitation current is reduced to a value
less than 1A after 1s for AREP/SHUNT, 10 s
for PMG.
- In the event of overexcitation, the current
is reduced as indicated in the next diagram
(see 3.2.1.4).
- Fuses: F1 on X1 and F2 on Z2 10A, 250V.
- Voltage sensing
• 0-110 V terminals = 95 to 140 V
• 0-220 V terminals = 170 to 260 V
• 0-380 V terminals = 340 to 528 V
For other voltages, a transformer should be
used.
- Voltage regulation:± 0.5%.
- Current sensing: (parallel operation): input
S1, S2 intended for 1 C.T. < 2.5 VA cl1,
secondary 1 A or 5 A.
3.2 - Configurations:
3.2.1 - Settings
3.2.1.1 - Voltage
Voltage adjustment via potentiometer P1 in
the ranges described in the table below:
For 50 and 60 Hz Max.
High range 320V < Un ≤ 530 V
Low range 80 V ≤ Un ≤ 320 V
WARNING
The allowed adjustment range is ± 5%;
when the setting exceeds these limits,
please check that it is conform with the
power table.
3.2.1.2 - Quadrature droop:
Quadrature droop adjustment via
potentiometer P4 within a range :
- from 0 to 8% with a PF=0.8 for 400V
applications.
- From 0 to 14% with a PF=0.8 for 240V
applications.
- From 0 to 8% for 110V applications with a
step-up transformer (ratio of 4) placed on
the voltage reference.
The potentiometer P4 has a non linear
response. Then, when a 1A secondary CT is
connected the effective range starts from
the the second 1/3 of
P4
range and in the
case of a 5A secondary CT the effective
range starts from the first 1/3.
When a 5A CT is used, the adjustment range
is higher, so
P4
must be set to the first 1/4
(anti-clockwise) and then progressively
increase it.
WARNING
The CT must be connected.
3.2.1.3 - Stability:
Stability adjustment via potentiometer P2.
Selection of rotating switch according to the
machine type and the response time as
indicated in paragraph 3.2.3.
3.2.1.4 - Excitation limitation:
Excitation limitation adjustment via
potentiometer P3 as described below.
The excitation current limitation threshold in
steady state is set by a potentiometer at
110% of the rated value. The adjustment is
made by the operator during the on-load test
at rated power by tuning the potentiometer.
When the excitation current exceeds this
value, a counter is activated at the speed of
one record per second for 90 s. When this
time is elapsed, the current is reduced to the
value of the rated excitation current. If in the
meantime the excitation current drops
below the threshold value, the counter
counts down at the same speed.
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