The load profile memory of KBR eBus devices can be synchronized in the following ways:
- External: A contact on the device synchronizes the measurement period.
- eBus: A broadcast command via the eBus synchronizes the measurement period.
- Internal: After an external synchronization command (contact or eBus), the next synchronizations are triggered internally via the device clock. The distance is determined by the parameterized period.
Internal synchronization has the advantage that neither an external contact needs to be wired, nor does a synchronization command have to be sent or answered. That’s why this is the standard for eBus projects. However, there is the risk that the synchronization time is ignored during startup. Then the pattern of the measurement periods deviates from the standard pattern, for example 0-15-30-45 (15 min. Period duration). This is detected via the ‘Synchronization monitoring’ function and corrected for each bus participant.
If a different grid is detected during internal synchronization, the affected device is reprogrammed to eBus synchronization. Subsequently, the eBus synchronization commands are sent at the appropriate time. If the grid differs by more than 1% of the period, the adjustment is adjusted in <1% increments over a period of time. This prevents the device from forming hull periods or invalidating measurement periods.
As soon as the measurement periods are back in sync with the project grid, the device is automatically switched back to internal synchronization.