ENGLISH
963857101_G
25
25
6. VOLTAGE REGULATOR
6.1 Matching Voltage regulator
The generators is usually equipped with an automatic voltage regulator for the specific application.
The below table shows the different type of AVRs depending on the type of demand and working.
MAINS TYPE OF REGULATORS
CODE RDT
TECNICAL NOTE
MARK “I”
M40FA640A_A
SIN.NT.015.X
MARK “V”
M16FA655A
SIN.NT.002.X
REGULATOR TO PMG
M40FA644A
SIN.NT.004.X
COSFI’ REGULATOR
M50FA400A
SIN.NT.013.X
MEC20 DIGITAL AVR
M31FA600A
SIN.NT.035.X
MEC100 DIGITAL AVR
M71FA320A
SIN.NT.023.X
6.2 Rheostat for remote voltage setting
For all generators, that rheostat can be inserted between the auxiliary terminals P and Q (FAST-ON terminals) of the AVR after
having removed the short-circuiting bridge. The external rheostat has to be inserted with its wiper in intermediate position and
then the internal potentiometer of AVR (P1) has to be reset to obtain the nominal voltage.
Rheostat features about must be minimum rating :
- 0,5 W, resistance 100 K Ohm to AVR (M40FA640A/A - M16FA655A and M40FA644A).
- 2 W, resistance 1 K Ohm to AVR W1 (M40FA610A).
- 1 W, resistance 10K Ohm to AVR DS-1 ( M31FA600A).
7. INSTRUCTIONS FOR MANUAL CONTROL OF GENERATORS
If the voltage regulator (AVR) breaks down, a manual control system can be used, when a 24 V D.C. power supply is
available.
This source could consist of a bank of batteries or of a voltage transformer and a rectifier unit connected at the alternator output.
- disconnect the two exciter stator terminals ( whites wire + and -) from AVR;
- apply the D.C. power supply to these two wires;
- set the rheostat R to adjust the alternator output voltage.
ATTENTION!:
compensate by manually increasing excitation as the load increases.
Before removing the load, reduce the excitation current.
Use the following table to select the rheostat:
Generator
I max
[A]
Max. resistance of rheostat
[
Ω
]
MJB 250 – 315
5
80
MJB 355
6
80
R
24 V
WHITE
WHITE
EXCITER
STATOR
WINDING
TERMINALS
