Maximum Operating Time; Reaching Of Maximum Inactivity Time; Reserves And Number Of Inverters Involved In Pumping - DAB MCE-150/P Installations- Und Wartungsanleitungen

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Maximum operating time

According to parameter ET (maximum operating time), each inverter has an hour counter, and the starting

order is updated on the basis of these values according to the following algorithm:

if at least half of the value ET is exceeded, priority is changed on the first shutdown of the inverter

(switch to standby).

if the value ET is reached without stopping, the inverter stops unconditionally and this sets to the

minimum restart priority (switch during operation).

If parameter ET (maximum working time) is set to 0, exchange occurs on each restart.

See ET: Tempo di scambio par 6.6.9.

The multi inverter system has an anti-stagnant algorithm that is aimed at maintaining pump efficiency and

integrity of the pumped liquid. It acts by enabling rotation of the pump starting order to ensure a delivery to all

pumps of at least one minute of flow every 23 hours. This is implemented regardless of the inverter

configuration (enabled or reserve). Priority switch envisages that the inverter stationary for 23 hours is set to

maximum priority in the starting order. This means that it is the first to be started up as soon as flow delivery

is required. The inverters configured as reserve have priority over the others. The algorithm terminates action

when the inverter has delivered at least one minute of flow.

After the anti-stagnant interval, if the inverter is configured as reserve, it is set to minimum priority to avoid

premature wear.

The multi inverter system reads how many elements are connected in communicating mode and calls this

Then, on the basis of parameters NA and NC it decides how many and which inverters must work at a given

time. NA represents the number of inverters involved in pumping NC represents the maximum number of

inverters that can run simultaneously.

In a series, if there are NA active inverters and NC simultaneous inverters, when NC is less than NA, this

means that a maximum of NC inverters will start up simultaneously, and these will switch between NA

elements. If an inverter is configured with reserve priority, it will set as last in the starting order, therefore for

example, if there are 3 inverters and one of these is configured as reserve, the reserve unit will start in third

place; otherwise if set to NA=2 the reserve will not start up unless one of the two active units sets to fault