Operation 15

3.2.5Automatic Overrun Compensation

The Batch Controller can be configured to automatically compensate for any overrun at the end of a batch.

Typically, this is due to the slowness of a valve to close or a pump to stop pumping on receiving a signal from the Batch Controller. The result is that the batch quantity will always read higher than the batch quantity set.

The Automatic Overrun Compensation can be enabled or disabled during the configuration process and this feature should only be used if the overrun is repeatable. The user is cautioned against using Automatic Overrun Compensation if the overrun is erratic such as may occur with changing back pressures or sticking valves.

In calculating the amount of overrun to be compensated for, the Batch Controller uses the average overrun on the last three batches.

The overrun is defined as the difference between the batch quantity set by the user and the batch total once the flow has stopped.

With Automatic Overrun Compensation, the Signal Timeout must be set to a value greater than zero.

Once the Batch Controller de-energizes both relays, the instrument looks for a Signal Timeout, indicating that the maximum interval between pulses has occurred and that the flow must, therefore, have stopped. It then uses the overrun quantity measured during this period and averages this together with the overrun on the last two batches. The resulting value is then subtracted from the next batch.

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Epson 214D-1 user manual Automatic Overrun Compensation
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214D-1 specifications

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