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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.

ARMTRONG POWER

SYSTEMS

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

AR-EXP-CUMMINS-07-00

OWNERS MANUAL

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Armstrong World Industries ACUM110, ACUM84, ACUM140, ACUM185, ACUM65, ACUM210 Voltag Regulator, USE of Potentiometers

ACUM210, ACUM110, ACUM65, ACUM185, ACUM140 specifications

Armstrong World Industries has established itself as a leader in the design and manufacture of innovative ceiling and wall solutions. Among their notable acoustic ceiling offerings are the ACUM84, ACUM210, ACUM65, ACUM140, and ACUM185 tiles. Each of these products is engineered with distinct features and technologies aimed at enhancing acoustic performance, durability, and aesthetics in various commercial spaces.

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