Schneider Altivar 61 VW3A3502 handleiding

Niet gecategoriseerd

Schneider

35 pagina's

PDF beschikbaar

Handleiding

1765272 10/2011 13

Operating Principle

Selecting the operating mode

The pump switching card provides 9 possible operating modes. These modes combine: the choice of variable pump, the choice of auxiliary

pump and limitation of relative operating time.

The mode is selected using the [Op. mode] (O01) parameter, ([1.14 Multi pump] (En -) menu).

Controlling an auxiliary pump

The PI regulator output (frequency reference of the variable pump) is used to control starting or stopping of an auxiliary pump with

hysteresis, as shown in the figure below:

When the frequency exceeds the starting threshold ([FrqAuxPumpOn] (O12) parameter), a time delay ([Pump Delay On] (O03)

parameter) is started to avoid the effects of transient flow fluctuations. If after this time delay, the frequency remains higher than the starting

threshold, another pump is started. When the start command is sent, a time delay ([Acc Aux Pump] (O06) parameter) is started to allow

the pump to reach its nominal speed before starting another pump (avoids oscillation).

When the frequency is below the stopping threshold ([FrqAuxPumpOff] (O13) parameter), a time delay is started ([Pump Delay Off] (O04)

parameter) to avoid the effects of transient flow fluctuations. If after this time delay, the frequency remains below the stopping threshold, a

pump is stopped. When the stop command is sent, a time delay ([Dec Aux Pump] (O07) parameter) is started to allow the pump to reach

an effective stop before stopping another pump (avoids oscillation).

"Sleep" function/"Wake up" function

This function is used to stop the variable pump when the flow rate is zero (all the auxiliary pumps are off).

In this case, if the frequency of the variable pump is below the "sleep" threshold ([Sleep thresh] (O15) parameter), a time delay

([SleepFunctDel] (O05) parameter) is started. If, after this time delay [SleepFunctDel] (O05), the frequency remains below the [Sleep

thresh] (O15) threshold, the variable pump then stops. The installation is in "sleep" state.

To switch to "wake up" state, the pressure feedback must drop to below the "wake up" threshold ([WUp thresh] (O16) parameter). The

variable pump is then started.

Startup

of an auxiliary pump

Frequency

corresponding to the flow

rate of an auxiliary pump

Flow rate of the installation

Frequency of the

variable pump

HSP

Starting

frequency

Stopping

frequency

Stop of an

auxiliary pump

LSP

Sleep threshold operating time

PI feedback

Motor

frequency

[WUp thresh] (O16)

[Sleep thresh] (O15)

[SleepFunctDel] (O05)

Bekijk gratis de handleiding van Schneider Altivar 61 VW3A3502, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.