Description

AVR STAMFORD SX460

Bộ điều áp avr Stamford sx460

The Cummins 305-0982 and 305-0949 is a half-wave phase-controlled thyristor type Automatic Voltage Regulator (AVR) and forms part of the excitation system for a brush-less generator.

*Thông số kỹ thuật (Technical Data):

1.INPUT:

Voltage :Jumper selectable

95-132V ac or190-264V ac

Frequency: 50-60 Hz nominal

2.OUTPUT:

Voltage: max 90V dc at 207V ac input

Current :continuous 4 A dc

Intermittent 6 A for 10 secs

Resistance: 15 ohms minimum

3.REGULATION
+/- 1.0% (see note 1)
4.THERMAL DRIFT
0.05% per deg. C change in AVR ambient (note 2)
5.TYPICAL SYSTEM RESPONSE
AVR response 20 ms
Filed current to 90% 80 ms
Machine Volts to 97% 300 ms
6.EXTERNAL VOLTAGE ADJUSTMENT
+/-10% with 1 k ohm 1 watt trimmer (see note 3)
7.UNDER FREQUENCY PROTECTION
Set point 95% Hz (see note 4)
Slope 170% down to 30 Hz

8.UNIT POWER DISSIPATION
10 watts maximum
9.BUILD UP VOLTAGE
4 Volts @ AVR terminals
10.ENVIRONMENTAL
Vibration 20-100 Hz 50mm/sec
100Hz – 2kHz 3.3g
Operating temperature -40 to +70°C
Relative Humidity 0-70°C 95% (see note 5)
Storage temperature -55 to +80°C
*NOTES
1. With 4% engine governing
2. After 10 minutes.
3. Applies to Mod status F onwards. Generator de-rate may
apply. Check with factory.
4. Factory set, semi-sealed, jumper selectable
5. Non condensing.

AVR Stamford SX460 – ADJUSTMENT OF AVR CONTROLS VOLTAGE ADJUSTMENT:
The generator output voltage is set at the factory, but can
be altered by careful adjustment of the VOLTS control on
the AVR board, or by the external hand trimmer if fitted.
Terminals 1 and 2 on the AVR will be fitted with a shorting
link if no hand trimmer is required. Terminals 3 and 4 are
linked only for special low voltage applications.
CAUTION: Do not increase the voltage above the rated
generator voltage. If in doubt, refer to the rating plate
mounted on the generator case.
CAUTION: Do not ground any of the hand trimmer
terminals as these could be above earth potential. Failure
to observe this could cause equipment damage.
If a replacement AVR has been fitted or re-setting of the
VOLTS adjustment is required, proceed as follows:

AVR Stamford SX460 – STABILITY ADJUSTMENT:
The AVR includes a stability or damping circuit to provide
good steady state and transient performance of the
generator.
The correct setting can be found by running the
generator at no load and slowly turning the stability
control anti-clockwise until the generator voltage starts to
become unstable.
The optimum or critically damped position is slightly
clockwise from this point (i.e. where the machine volts
are stable but close to the unstable region).
AVR Stamford SX460 – UNDER FREQUENCY ROLL OFF (UFRO) ADJUSTMENT:
The AVR incorporates an underspeed protection circuit
which gives a volts/Hz characteristic when the generator
speed falls below a presettable threshold known as the
“knee” point.
The red Light Emitting Diode (LED) gives indication that
the UFRO circuit is operating.
The UFRO adjustment is preset and sealed and only
requires the selection of 50 / 60Hz using the jumper link.
For optimum setting, the LED should illuminate as the
frequency falls just below nominal, i.e. 47Hz on a 50Hz
system or 57Hz on a 60Hz system

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