Function

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Synchronizing

The variable system is synchronized to the fixed system (variable and fixed system

can be configured) for voltage and frequency. This is done by sending set point

values through the CAN bus to the lower level GCP control that are electrically

connected with the configured variable system. The LS 4 calculates the correct

synchronous point to issue a CB close command using the switching time of the

CB (Parameter 37). Synchronizing/closing of the CB is done if the following

conditions are fulfilled simultaneously:

• The unit is in automatic mode.

• The synchronizing function is enabled (Parameter 31).

• Voltage and frequency of both systems [A] and [B] are within the configured

range (for both systems this range is adjustable by changing the settings for the

voltage monitoring functions of system [A] if this protection is enabled;