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Automatic Voltage Regulators

MX Series
 

PERMANENT MAGNET GENERATOR TYPE AUTOMATIC VOLTAGE REGULATOR (“M” PREFIX)

 

For the ultimate in control, an AVR designed to operate with the STAMFORD Permanent Magnet Generator (PMG) system is often specified. In this design, the AVR receives its power from a separate source in the form of a small PMG, mounted on the end of the main generator shaft.

 

The advantage of this is the AVR power source is not affected by sudden loads applied to the generator, hence the excitation remains at full strength, providing superior motor starting and short circuit performance.

 

MX341

The MX341 achieves voltage regulation of ±1.0%, through the use of the PMG system. Protection against sustained over-excitation is standard on this AVR, as is a special engine relief load acceptance feature which enables full load to be applied in a single step.

 

MX321

The MX231 has all the features of the MX341, additionally achieving voltage regulation of 0.5% with 3 phase RMS sensing, built in overvoltage protection and optional short circuit current level adjustment.

The combination of PMG providing an isolated power source and the MX321 s RMS sensing makes an ideal arrangement for supplying the non-linear loads such as supplies for computers or variable speed motors etc.

 

PRODUC FEATURES SUMMARY

STAMFORD ac generators can be configured to meet practically every application requirement. This summary chart shows the main features of the product ranges.


LOW VOLTAGE

PHASE

POLES

Bearings

STANDARD AVR

AVR OPTIONS

TRANSFORMER CONTROL OPTION

1               3

2       4       6

1           2

BCI 16

•                •

•       •

•           • 

SX460

-

BCI 18

•                •

•       •

•           • 

SX460

SA465

-

SX421**

BCAI 16

•                •

•       •

•           • 

SX460

SA465

BCLI16

•                •

•       •

•           • 

SX460

SA465

BCLI18

•                •

•       •

•           • 

SX460

SA465

 

-

SA465

SX421**

UCI/UCDI 22/27

•                •

         •      

•           • 

 

SX440

• UC22 ONLY

 

SX421

 

MX341

SX460

MX321

UCM 22/27

•               

         • 

•           • 

MX341

MX321

 

HCI/HCKI 4/5

         • 

•           • 

SX 440

 

 

HCM 4/5

         • 

•           • 

MX341

 

 

HCI 6

         •        • 

•           • 

MX321

 

 

HCM 6

         •        • 

•           • 

MX321

 

 

HCI/HCKI 7

         •        • 

•           • 

MX321

 

 

HCM7

         •        • 

•           • 

MX321

 

 

 


 
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