1 - GENERAL INFORMATION
1.1 - Description
The R450 AVR is supplied in a casing designed to be mounted on a panel with dampers.
- Operating temperature: 20°C to +70°C.
- Storage temperature: 55°C to +85°C.
- Shocks on the base: 9 g depending on the 3 axes.
- Vibrations: less than 10 Hz, 2 mm half-peak amplitude 10 Hz to 100 Hz: 100mm/s, above 100 Hz: 8 g.
WARNING
The AVR is IP00, it must be incorporated in an environment which ensures it a IP20 protection.
1.2 - Identification
There are 3 different versions available:
These 3 AVRs are exactly identical in terms of characteristics and dimensions.
- R 450: with "Faston" connectors and
single - phase sensing.
-R 450M: with "Mate N Lok" connectors and single-phase sensing.
- R450T: with "Mate N Lok" connectors and three-phase sensing.
1.3 - Tools
The "Mate N Lok" connectors tools references are the following:
- crimping pliers: Ref TYCO 654.149.1
- Extractor: Ref TYCO 539.972.1
2 - POWER SUPPLY
Both the AREP & PMG excitation systems are controlled by the AVR
21 - AREP excitation system
With AREP excitation, the electronic AVR is powered by two auxiliary windings which are independent of the voltage sensing circuit.
The first winding has a voltage proportional to the alternator main voltage (Shunt characteristic), the second one has a voltage proportional to the stator current (compound characteristic : Booster effect).
The power supply voltage is rectified and filtered before being used by the AVR
monitoring transistor.
The rotating switch should be in the SHUNT/
AREP position (see 3.2.3).
2.2 - PMG excitation system
With PMG excitation, a permanent magnet generator (PMG) added to the alternator
supplies the AVR with voltage which is independent of the main alternator winding.
These two excitation principles provide the machine with a short-circuit current overload capacity of 3 IN for 10 s. The AVR monitors the alternator output voltage by adjusting the excitation current.
The rotating switch should be in the PMG position (see 3.2.3)
2.3 - SHUNT or separate excitation system
With SHUNT excitation, the AVR is powered by the main winding (100V to 140V - 50/60 Hz ) by using X1, X2 on the AVR.
The rotating switch should be in the SHUNT/ AREP position (see 3.2.3).
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 3.4.1.4).
- Fuses: F1 on X1 and F2 on Z2 10A, 250V.
- Voltage sensing
R450:
0-110 V terminals = 95 to 140 V
0-220 V terminals = 170 to 260 V
0-380 V terminals = 340 to 528 V
R450 M & T
High range: > 320V
For other voltages, a transformer should be
used.
- Voltage regulation:± 0.5%.
- Current sensing: (parallel operation): input
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:
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.