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AR-EXP-CUMMINS-07-00 OWNERS MANUAL
Page 34
In case of complete overhaul of genset, the bearing of the
generator should be changed.
On request prelubricated bearings with regreasing system
can be mounted. When regreasing use 20/ 30 grams of
grease.
Following types of grease are to be recommended for nor-
mal application:
MOBIL OIL: MOBILUX 3
SHELL: ALVANIA 3
AGIP: GR MW 3
ESSO: BEACON 3
9.3. VOLTAG REGULATOR
The generators are provided with automatic voltage regula-
tor. The AVR is provided with potentiometers to adapt the
characteristics of the AVR to different operating conditions.
The AVR is provided with adjustable stability circuitry to
allow operations in a wide range of applications.
The AVR is equipped also with protecting circuit allowing
the generator to operate underspeed if not loaded.
ATTENTIONI: it is not advisable to have the generator oper-
ating loaded when the frequency (speed) is below the rated
value: this kind of operation is an overload for the whole
generator excitation system.
CONNECTION OF AVR
The AVR is connected to the terminals of the generator and
to exciter FAST-ON terminals.
USE OF POTENTIOMETERS
P1/VOLT- Potentiometer for adjusting the output voltage of
the generator; it allows a wide range of voltage setting (i.e.
between 350 and 470 V; or between 170 and 260 V de-
pending on winding connections)). When resetting the po-
tentiometer, the voltage has to be set in the range +5%,-5%
around the rated voltage of the machine. In order to obtain
a finer regulation, or to adjust the voltage from control
panel or to limit the voltage range, it is possible to insert an
external potentiometer.
P2/FREQ- Potentiometer for changing the low speed protec-
tion. Usually it is set in order to reduce the excitation when
the speed is 10 % below the rated value at 50 Hz. By re-
moving the bridge which is normally shorting the auxiliary
terminals 60-Hz of the regulator, the low speed protection
acts properly for 60 Hz.
P3/STAB- Potentiometer for stability adjust. By rotating it
clockwise the stability of the regulator increases, but the
response time becomes longer.
P4/AMP- Potentiometer for chancing the overexcitation limit
device. The overexcitation limit device helps to protect the
excitation system. This device is delayed to avoid transitory
conditions (in case of overexcitation).
On the AVR there is a protecting fuse. ln case it should be
necessary to replace it, high speed fuses should be used; in
addition they should have high breaking resistance with a
rated voltage of 50OV, and rated current of 1OA. The AVR is
connected to the terminals of the generator and to exciter
using FAST—ON terminals.
Phone: (305) 470 0058
Fax: (305) 470 0068
Toll Free: 1-800 238 0732
8254 NW 58th St., Miami, FL.
33166, U.S.A.
e-mail:
sales@armstrongpower.com
ARMTRONG POWER
SYSTEMS