MX-341 Automatic Voltage Regulator

The MX-341 is a three phase sensed Automatic Voltage Regulator (AVR) and forms part of the excitation system for a brushless generator. Excitation power is derived from a three phase permanent magnet generator (PMG), to isolate the AVR control circuits from the effects of nonlinear loads and to reduce radio frequency interference on the generator terminals.

• Sensing input
• Voltage 190-280V AC max, 1 or 3 phase
• Frequency 50-60 Hz nominal
• Power input
• Voltage 170-280V ac max, 3 phase, 3 wire
• Current 3A/phase
• Frequency 100-120 Hz nominal
• Output
• Voltage max 120V dc
• Current continuous 3.7 A, intermittent 6A for 10 secs.
• Resistance 15 ohms minimum
• Regulation
• +/-0.5% RMS with 4% engine governing
• Thermal drift
• 0.02% per deg. C change in AVR ambient
• Soft start ramp time
• 0.4-4 seconds
• Typical system response
• AVR response- 10ms
• Filed current to 90%- 80ms
• Machine volts to 97% 300ms
• External voltage adjustment
• +/- 10% with 5k ohm 1 watt trimmer (does not come with AVR)
• 5k trimmer is optional.
• Under frequency protection
• Set point- 95% Hz
• Slope- 100-300% down to 30 Hz
• Max Dwell- 20% volts/S recovery
• Unit power dissipation
• 18 watts maximum
• Analogue input
• Maximum input +/- Vdc
• Sensitivity 1v for 5% generator volts (adjustable)
• Input resistance 1k ohm
• Quadrature droop input
• 10 ohms burden
• Max. sensitivity: 0.22 A for 5% droop 0PF
• Max. input: 0.33A
• Current limit input
• 10 ohms burden
• Sensitivity range: 0.5-1A
• Over voltage detector input
• Set point: 300v.
• CB trip coil volts: 10-30 Vdc
• CB trip coil resistance: 20-60 ohms
• Over excitation protection
• Set point 75 V dc
• Time delay 8-15 secs. (fixed)
• Environmental
• Vibration 20-100 Hz (50mm/sec)
• Operating temperature -40 to +70 C.
• Relative humidity 0-70 C
• Storage temp. -55 to +80 C