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2 Parameter Description
25-25 OBW Time
Range:
10 s*
[0 - 300 s]
2
25-26 Destage At No-Flow
Option:
[0] *
Disabled
[1]
Enabled
25-27 Stage Function
Option:
[0]
Disabled
[1] *
Enabled
25-28 Stage Function Time
Range:
15 s*
[0 - 300 s]
244
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Function:
Staging a fixed speed pump creates a momentary pressure peak in the system, which might exceed
the Override Bandwidth (OBW). It is not desirable to destage a pump in response to a staging
pressure peak. The OBW Time can be programmed to prevent staging until the system pressure
has stabilized and normal control established. Set the timer to a value that allows the system to
stabilize after staging. The 10 second factory setting is appropriate in most applications. In highly
dynamic systems, a shorter time may be desirable.
Function:
The Destage at No-Flow parameter ensures that when a no-flow situation occurs, the fixed speed
pumps will be destaged one-by-one until the no-flow signal disappears. This requires that No Flow
Detection is active. See par. 22-2*.
If Destage at No-Flow is disabled the Cascade Controller does not change the normal behavior of
the system.
Function:
Disabled
If the Stage Function is set to
[0], par. 25-28
Function:
The Stage Function Time is programmed to avoid frequent staging of the fixed speed pumps. The
Enabled
Stage Function Time starts if it is
speed pump is running at
Motor Speed High Limit
Motor Speed High Limit [Hz]
par. 4-14
, 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.
MG.20.W1.22 - VLT is a registered Danfoss trademark
VLT Automation VT Drive FC322
Programming Guide
Stage Function Time
will not be activated.
Stage Function
[1] by par. 25-27
, and when the variable
, par. 4-13
Motor Speed High Limit [RPM]
or
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