R448 datasheet(13/16 Pages) NIDEC

13 / 16 page

Installation and maintenance

R448 & R448 V50

A.V.R.

3972 en - 05.2008 / e

LEROY-SOMER

Open switch (D) : the excitation current

should increase to its preset ceiling, remain

at that level for

≥ 1 second in AREP or 10

seconds in PMG and then drop to < 1A.

To reset, switch off the power supply by

opening switch (A). Reconnect the AVR to

the alternator and adjust the reference

voltage via P2 to obtain the rated voltage.

(*): In some countries it is a legal

requirement to have a short-circuit current,

so as to offer discriminating protection.

4.2.3 - Special type of use

Excitation circuit E+, E- must not be left

open when the machine is running :

AVR damage will occur.

4.2.3.1 - R448 field weakening (SHUNT)

The exciter is switched off by disconnecting

the AVR power supply (1 wire - X1 or X2).

Contact rating 16 A - 250V A.C.

4.2.3.2 - R448 field weakening (AREP/

PMG)

The exciter is switched off by disconnecting

the AVR power supply (1 wire on each

auxiliary winding) - contact rating 16 A -

250V A.C.

Connection is identical for resetting the

AVR internal protection.

In case of using the de-excitation,

provide a forced excitation.

4.2.3.3 - R448 field forcing

WARNING

E+

E-

E+

E-

Applications

B volts

Time t

Guaranteed voltage build-up

12 (1A)

1 - 2 s

Parallel operation, de-energized

12 (1A)

1 - 2 s

Parallel operation, at standstill

12 (1A)

5 - 10 s

Frequency starting

12 (1A)

5 - 10 s

Sustained voltage on overload

12 (1A)

5 - 10 s

E+

E-

Battery (B Volt)

(400V - 10A)

Exciter field

Diode

B Volt

Forced excitation

Time

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