25-56 Staging Mode at Alternation
Option:
Function:
[0] *
Slow
[1]
Quick
This parameter is only active if the option selected in
Lead Pump Alternation
, par. 25-50, is different
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.
Illustration 2.7: Slow Configuration
Illustration 2.8: Quick Configuration
25-58 Run Next Pump Delay
Range:
Function:
0.1 s*
[0.1 - 5.0 s]
This parameter is only active if the option selected in par. 25-50
Lead Pump Alternation
, is different
from
Off
[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
Staging Mode at Alternation
, the illustration
for description of staging and alternation.
25-59 Run on Mains Delay
Range:
Function:
0.5 s*
[Application dependant]
This parameter is only active if the option selected in par. 25-50
Lead Pump Alternation
, is different
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
Staging Mode at Alternation
, the illustration for
description of staging and alternation.
2.21.6 25-8* Status
Readout parameters informing about the operating status of the cascade controller and the pumps controlled.
VLT
p
Automation VT Drive FC322
Programming Guide
2 Parameter Description
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p
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