Description

ĐIỀU ÁP AVR MECC SR7/2

Application:

The supply coincides with the sensing:
In this case the AVR MECC SR7/2 supply should be connected to terminals 3 and 5 (in the case of three-phase  genera-tors, terminal 5 is normally connected with the star point). Terminals 3 and 4 should be connected to each other in such a way that the supply is also the sensing. This connection is necessary when the generator does not have auxiliary winding for supplying the regulator.

The supply and sensing are separate:

This is the case of a generator equipped with auxiliary winding for regulator supply. Supply is always connec-ted to terminals 3 and 5 of the regulator. In both these cases (1 and 2) the SR7/2 supply can vary from 80 to 270 Vac. But it should be noted that terminals 2 and 3 should be bridged for supply with voltage between 80 and 160 Vac, while the same terminals should be left open if the voltage is between 160 and 270 Vac.

Sensing: should be connected to terminals 4 and 5 and can vary from between 80 to 700 Vac. The sensing is single phase only and therefore normally connected to one alternator phase.

Operation at 60 Hz: When operating at 60 Hz, terminals 5 and 6 should be connected to each other in order to keep the low frequency protection correctly regulated.

External potentiometer: the 100 kohm (0,5W) external potentiometer that permits a  +   5 % distanced regulation of the voltage should be connected to terminals 5 and 7.

Mecc Alte SR7-2G Features and Capabilities:

• Full digital controlled regulator, based on DSP
• On-board machine installation
• Suitable for all self-regulated alternators
• Voltage supply: 40Vac – 270Vac (from auxiliary winding, output voltage or PMG)
• Frequency range: 12Hz – 72Hz
• “Sensing” of voltage with true rms or average measurement (70÷280 Vac)
• Maximum continuous output current: 4Adc
• Precision of voltage regulation: ± 1% from no-load to nominal load in static condition, with any power factor and for frequency variations ranging from -5% to +20% of the nominal value
• Transient power drops and overvoltage within ± 15%
• Voltage recovery time within ± 3% of the value set, in less than 300 msec.
• Transient overvoltage during start up: less than 5% of nominal voltage.
• Single phase sensing
• Parameters: VOLT, STAB, AMP and Hz can be set with trimmers (default) 50/60Hz through a “jumper” (default); all parameters can be programmed via software.
• Analogical remote control of output voltage is possible through external voltage (0÷2,5Vdc) or with a 10 Kohm linear potentiometer.
• Environmental temperature: -25°C – +70°C
• Underspeed protection with adjustable threshold and slope
• Overvoltage and undervoltage alarms
• Excitation overcurrent protection with delayed intervention
• Management of temporary short circuits (start up of asynchronous motors)
• Open collector output (not insulated) signalling intervention of protective devices (insulation on optional DI1 module) with programmable activation with respect to the individual alarms and the possibility to delay intervention.
• Abnormal operation conditions storage (type of alarm, number of events, duration of the last event, total time)
• Memorization of the regulator operation time (starting from revision 11 of the Firmware)
• RS232 and RS485 serial communications interface (with optional DI1 module)

AVR Mecc Alte SR7/2 – Product Description:

The AVR Mecc SR7/2 is designed to control many different types of generators. However, it must be properly configured to obtain the best performance.