MX341 GENERAL DESCRIPTION
The MX341 is a two phase sensed Automatic Voltage Regulator (AVR) and forms part of the excitation system for a brushless generator.
In addition to regulating the generator voltage, the AVR circuitry includes protective features to ensure safe reliable control of the generator. Excitation power is derived from a permanent magnet generator (PMG) to guarantee low Radio Frequency Interference (RFI) and immunity from thyristor type loads.
The AVR is linked with the main stator windings and controls the power fed to the exciter stator and hence the main rotor to maintain the machine output voltage within the specified limits, compensating for load, speed, temperature and power factor of the generator.
Soft start circuitry is included to provide a smooth controlled build up of generator output voltage.
A frequency measuring circuit continually monitors the shaft speed of the generator and provides underspeed protection of the excitation system by reducing the generator output voltage proportionally with speed below a presettable threshold. A further enhancement of this feature is an adjustable volts/Hz slope to improve frequency recovery time on turbo charged engines.
Uncontrolled over excitation is limited to a safe period by internal shutdown of the AVR output device. This condition remains latched until the generator has been stopped.
Provision is made for the connection of a remote voltage trimmer allowing the user fine control of the generator's output.
Accessories are available for this AVR. Please refer to factory for further details.
TECHNICAL SPECIFICATION
SENSING INPUT
Voltage: 170~250 V ac max
Frequency: 50~60Hz nominal
Phase: 2
Wire: 2
POWER INPUT (PMG)
Voltage: 140~220V ac
Current: 3A/phase
Frequency: 100~120 Hz nominal
Phase: 3
Wire: 3
OUTPUT
Voltage: Max 120 V dc
Current: Continuous 2.7A
Transient 6A for 10 seconds
Field Resistance: 15 Ohm minimum
REGULATION (See Note 1) +/- 1%
THERMAL DRIFT
(after 10 min)
1% for 40º C change in AVR ambient
SOFT START RAMP TIME
3 seconds
TYPICAL SYSTEM RESPONSE
Field current to 90% 80ms
Machine Volts to 97% 300ms
EXTERNAL VOLTAGE ADJUSTMENT
+/- 6% WITH 1K Ohms trimmer
UNDER FREQUENCY PROTECTION
Set Point: (See note 2) 95% Hz
Slope: 100-300% down to 30Hz
UNTIT POWER DISSIPATION
12 watts maximum
ACCESSORY INPUT
+/- 1v = +/- 5% change in output volts
QUADRATURE DROOP
Maximum sensitivity (10 Ohms Burden)
0.07A for 5% droop @ 0p. F.
OVER EXCITATION PROTECTION
Set Point: 75 V dc
Time Delay ( fixed): 10 seconds
ENVIRONMENTAL
Vibration: 20-100Hz 50mm/sec
100Hz-2 kHz 3.3g
Relative Humidity: 0-60º C 95%
Operating Temperature: -40º C to +70º C
Storage Temperature: -55º C + 80º C
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