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AVR MX321 Automatic Voltage Regulator with Hard Shell for Stamford Generator

(1 customer review)

  • MX321 AVR adjustment rate is better than 0.5%
  • High-quality generator voltage regulator
  • Long service life
  • Built-in low-speed protection
  • Over excitation protection
  • Over-voltage protection
  • Over-current protection
  • LAM Protection
  • Professional manufacturing
  • Exquisite workmanship
  • High reliability
  • High-quality capacitor and terminal
  • Superior performance
  • Click Here To Download MX321 User Manual

 22,000.00  26,000.00

Buy all Stamford AVRs and Rotating Rectifier assemblies in Pakistan. You can buy AVR MX321, automatic voltage regulator, with hard shell for Stamford generator online anywhere from Pakistan or by visiting Electronic Power House (EPH) and Tetralink Technologies (TLT)   in Lahore who are the main distributor of Stamford in Pakistan. All original Stamford products are available at very reasonable and best prices in Pakistan

Key Features:

  • MX321 AVR adjustment rate is better than 0.5%
  • High-quality generator voltage regulator
  • Long service life
  • Built-in low-speed protection
  • Over excitation protection
  • Over-voltage protection
  • Over-current protection
  • LAM Protection
  • Professional manufacturing
  • Exquisite workmanship
  • High reliability
  • High-quality capacitor and terminal
  • Superior performance

General description

MX321 is a three-phase sensed Automatic Voltage Regulator and forms part of the excitation system for a brush-less 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. Sustained generator short circuit current is another feature of the PMG system.
The AVR senses the voltage in the main generator winding and controls the excitation to maintain the generator output voltage within the specified limits, compensating for load, speed, temperature, and power factor of the generator. Three-phase RMS sensing is employed for superior voltage regulation.
Adjustable Soft start circuitry is included to provide a smooth controlled build-up of the generator output voltage.
A frequency measuring circuit continually monitors the shaft speed of the generator and provides under-speed protection of the excitation system by reducing the generator output voltage proportionally with speed below a pre-settable threshold. A further enhancement of this feature is an adjustable volt per Hertz slope and voltage recovery time, to improve the response of turbocharged engines.
Current limiting may be included to allow control over the amount of sustained short circuit current.
Maximum excitation is limited to a safe period by the internal shutdown of the AVR output device. This condition remains latched until the generator has stopped.
The AVR includes an over-voltage protection feature with an internal shutdown of the AVR output device, plus the ability to trip an optional excitation circuit breaker if required. Provision is made for the connection of a remote voltage trimmer, allowing the user fine control of the generator’s output.
An analogue input is provided allowing connection to a Newage Power Factor controller or other external devices with compatible output.
The AVR has the facility for droop CT connection, to allow parallel running with other similarly equipped generators.

brands

STAMFORD

color

Black

Technical Specification

SENSING INPUT
Voltage 190-264V ac max, 2 or 3 phase
Frequency 50-60 Hz nominal

POWER INPUT (PMG)
Voltage 170-220V ac max, 3 phase, 3 wire
Current 3A/phase
Frequency 100-120 Hz nominal

OUTPUT
Voltage max 120V dc
Current continuous 3.7 A (see note 1)
Intermittent 6A for 10 secs.
Resistance 15 ohms minimum

REGULATION
+/- 0.5% RMS with 4% engine governing (see note 2)

THERMAL DRIFT
0.02% per deg. C change in AVR ambient (note 3)

SOFT START RAMP TIME
0.4 – 4 seconds

TYPICAL SYSTEM RESPONSE
AVR response 10 ms
Filed current to 90% 80 ms
Machine Volts to 97% 300 ms

EXTERNAL VOLTAGE ADJUSTMENT
+/-10% with 5 k ohm 1 watt trimmer (see note 4)

UNDER FREQUENCY PROTECTION
Set point 95% Hz (see note 5)
Slope 100-300% down to 30 Hz
Max. Dwell 20% volts/S recovery

UNIT POWER DISSIPATION
18 watts maximum

ANALOGUE INPUT
Maximum input +/- 5 Vdc (see note 6)
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: 0.33 A

CURRENT LIMIT INPUT
10 ohms burden
Sensitivity range: 0.5 – 1A

OVER VOLTAGE DETECTOR INPUT
Set point: 300v. Time delay: 1 Sec (fixed)
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 seconds (fixed)

ENVIRONMENTAL
Vibration 20-100 Hz 50mm/sec
100Hz – 2kHz 3.3g
Operating temperature -40 to +700
C
Relative Humidity 0-700
C 95% (see note 7)
Storage temperature -55 to +800
C

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  1. admin

    A very good AVR with PMG input for Stamford alternators

    admin

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