2018.01 / g
Electric Power Generation
9
Installation and maintenance
R449 revision f
AVRs
3983 en -
1.3.2 - Detection
The detection is single-phase and is isolated
using an internal transformer.
Sensing VA: 5VA
J1 connector, input voltages:
- Terminals 0-110V:
voltage range from 85 to 130V
- Terminals 0-220V:
voltage range from 170 to 260V
- Terminals 0-380V:
voltage range from 340 to 520V
1.3.3 - Voltage accuracy
The voltage accuracy is +/- 0.5 %Un, steady
state, linear load.
1.3.4 - Voltage adjustment
The voltage is adjusted either using an
internal potentiometer P2, with a voltage
range of +/- 10%Un, or using an external
potentiometer (as an option).
The voltage is minimum when internal
potentiometer P2 has been rotated fully
anti-clockwise.
P2
Connecting the external potentiometer:
- External potentiometer 470Ω 3W:
voltage range +/- 5%Un
- External potentiometer 1kΩ 3W:
voltage range +/- 10%Un
Remove jumper ST4 and connect the
external potentiometer as shown in the
diagram below. If a regulator is built into the
terminal box, remove jumper ST10 from
terminal block C and connect the external
potentiometer.
J2
ST4
J2
ST4
Rhe
Internal
External
Voltage setting : ST4
A.F. = Internal
1.3.5 - Power supply
The power can be supplied:
- using 2 independent auxiliary windings
integrated in the alternator stator (AREP
excitation),
- using a single or 3-phase power VT,
- using a single or 3-phase PMG.
The single or 3-phase voltage must not
exceed 240V AC.
1.3.6 - Output power
The output power is 7A 63V under normal
conditions and 15A for 10s under overload
conditions.
1.3.7 - Quadrature droop (1F)
Quadrature droop is achieved using a
parallel operation CT (In/1A, 10VA Cl1).
The voltage droop can be adjusted using
potentiometer P1. The voltage range is
5%Un for Pn PF 0.8.
The quadrature droop is at 0 when
potentiometer P1 has been rotated fully
anti-clockwise.
P1
1.3.8 - Frequency compared with
voltage (without LAM)
100 %
50 Hz
60 Hz
Hz
50 Hz
48 Hz
57.5 Hz
60 Hz
Voltage
Bend
U/U
N
Frequency
1.3.9 - LAM (Load Acceptance Module)
characteristics
The LAM system is integrated in the
regulator, as standard it is active (ST5 with
bridge). It can be deactivated by removing
the ST5 bridge. It can be adjusted to 13% or
25% by means of the ST10 jumper (factory
setting 15%).
- Role of the “LAM” (Load Acceptance
Module):
On application of a load, the rotation speed
of the generator set decreases. When it
passes below the preset frequency
threshold, the LAM causes the voltage to
drop by approximately 13% or 25% and
