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Synchroscopes – Sifam Tinsley


The Sifam Tinsley SQ94 Synchroscope provides an illuminated indication of frequency difference and phase difference between two AC systems. When two alternators are paralleled, it is necessary that the frequency must be equal and the phase must also match. .

The SQ94 indicates the phase & frequency difference between the BUS Voltage (reference voltage) & the GENERATOR Voltage (incoming voltage). It denotes the actual frequency difference corresponding to the inverse of time taken for one rotation of the illuminated vector spot. The rotation of the vector spot is with reference to the bus voltage. If the vector spot LED turns clockwise, it indicates the GENERATOR frequency is greater than the BUS frequency. This means the speed of the generator must be reduced by the operator. If the spot LED turns anticlockwise, the GENERATOR frequency is less than BUS frequency. In this case speed of the generator must be increased. When the Frequency matches, but the Phase does not, one red LED will illuminate, corresponding to the phase difference.

  • Rotating LEDs indicate frequency difference between generator & bus voltages.
  • Static red LED indicates phase difference between the two systems.
  • Green SYNC LEDs indicate frequency & phase match.

Catalog Page 028a                                        SQ94_Datasheet

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Item # Input Voltage Size P/N
SQ94-V02XXNXWAW0ST100V or 127V96x96mmSQ94-V02XXNXWAW0ST
SQ94-V12XXNXWAW0ST480V or 415V96x96mmSQ94-V12XXNXWAW0ST
SQ94-V03XXNXWAW0ST110V or 100V96x96mmSQ94-V03XXNXWAW0ST
SQ94-V05XXNXWAW0ST240V or 220V96x96mmSQ94-V05XXNXWAW0ST
SQ94-V04XXNXWAW0ST127V or 120V96x96mmSQ94-V04XXNXWAW0ST
SQ94-V06XXNXWAW0ST380V or 415V96x96mmSQ94-V06XXNXWAW0ST
SQ14-V01XXNXWAW0ST100V or 120V144x144mmSQ14-V01XXNXWAW0ST
SQ94-V07XXNXWAW0ST380V or 440V96x96mmSQ94-V07XXNXWAW0ST
SQ14-V02XXNXWAW0ST100V or 127V144x144mmSQ14-V02XXNXWAW0ST
SQ14-V03XXNXWAW0ST110V or 100V144x144mmSQ14-V03XXNXWAW0ST
SQ14-V04XXNXWAW0ST127V or 120V144x144mmSQ14-V04XXNXWAW0ST
SQ14-V05XXNXWAW0ST240V or 220V144x144mmSQ14-V05XXNXWAW0ST
SQ14-V06XXNXWAW0ST380V or 415V144x144mmSQ14-V06XXNXWAW0ST
SQ14-V07XXNXWAW0ST380V or 440V144x144mmSQ14-V07XXNXWAW0ST
SQ14-V12XXNXWAW0ST480V or 415V144x144mmSQ14-V12XXNXWAW0ST
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