Danfoss VLT Automation VT Drive FC 322 Programming Manual page 253

VLT Automation VT Drive FC322
Programming Guide
25-56 Staging Mode at Alternation
Option:
[0] * Slow
[1] Quick
Illustration 2.7: Slow Configuration
Illustration 2.8: Quick Configuration
25-58 Run Next Pump Delay
Range:
0.1 s* [0.1 - 5.0 s]
25-59 Run on Mains Delay
Range:
0.5 s* [Application dependant]
2.21.6 25-8* Status
Readout parameters informing about the operating status of the cascade controller and the pumps controlled.
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Function:
This parameter is only active if the option selected in
from Off [0]
Two types of staging and destaging of pumps are possible. Slow transfer makes staging and de-
staging smooth. Quick Transfer makes staging and destaging as fast as possible; the variable speed
pump is just cut out (coasted).
Slow [0]: At alternation, the variable speed pump is ramped up to maximum speed and then ramped
down to a stand still.
Quick [1]: At alternation, the variable speed pump is ramped up to maximum speed and then coas-
ted to stand still.
The below examples show Alternation in both Quick and Slow configurations.
Function:
This parameter is only active if the option selected in par. 25-50
Off
from [0].
This parameter sets the time between stopping the old variable speed pump and starting another
pump as a new variable speed pump. Refer to par. 25-56
for description of staging and alternation.
Function:
This parameter is only active if the option selected in par. 25-50
from Off [0].
This parameter sets the time between stopping the old variable speed pump and starting this pump
as a new fixed speed pump. Refer to par. 25-56
description of staging and alternation.
MG.20.W1.22 - VLT is a registered Danfoss trademark
2 Parameter Description
Lead Pump Alternation
, par. 25-50, is different
Lead Pump Alternation , is different
Staging Mode at Alternation
, the illustration
Lead Pump Alternation
, is different
Staging Mode at Alternation , the illustration for
2
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