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25-27 Stage Function
Option:
Function:
If the Stage Function is set to
Disabled
[0], par.25-28
will not be activated.
[0]
Disabled
[1] *
Enabled
25-28 Stage Function Time
Range:
Function:
15 s*
[0 - 300 s]
The Stage Function Time is programmed to avoid frequent staging of the fixed speed pumps. The
Stage Function Time starts if it is
Enabled
[1] by par.25-27
, and when the variable
speed pump is running at
Motor Speed High Limit
, with at least one fixed speed pump in the stop position. When
the programmed value of the timer expires, a fixed speed pump is staged.
25-29 Destage Function
Option:
Function:
The Destage Function ensures that the lowest numbers of pumps are running to save energy and
to avoid dead head water circulation in the variable speed pump. If the Destage Function is set to
Disabled
[0], the par.25-30
[0]
Disabled
[1] *
Enabled
25-30 Destage Function Time
Range:
Function:
15 s*
[0 - 300 s]
The Destage Function Timer is programmable to avoid frequent staging/destaging of the fixed speed
pumps. The Destage Function Time starts when the adjustable speed pump is running at par.
4-11
, with one or more fixed
speed pumps in operation and system requirements satisfied. In this situation, the adjustable speed
pump contributes a little to the system. When the programmed value of the timer expires, a stage
is removed, avoiding dead head water circulation in the adjustable speed pump.
2.21.4 25-4* Staging Settings
Parameters determining conditions for staging/destaging the pumps.
VLT
®
AQUA Drive Programming Guide
2 Parameter Description
MG.20.O4.02 - VLT
®
is a registered Danfoss trademark
217
2