Danfoss VLT FC 100 Series Programming Manual page 192

Parameter Description
25-26 Destage At No-Flow
Option: Function:
The de-stage at the no-flow parameter ensures
that when a no-flow situation occurs, the fixed
speed pumps will be de-staged one-by-one until
the no-flow signal disappears. This requires that
no-flow detection is active. See parameter group
22-2*.
If De-stage at No-Flow is disabled the Cascade
Controller does not change the normal behavior
of the system.
[0] Disabled
*
[1] Enabled
25-27 Stage Function
Option: Function:
If the stage function is set to Disabled [0],
25-28 Stage Function Time will not be activated.
[0] Disabled
[1] Enabled
25-28 Stage Function Time
Range: Function:
15 s [0 - Stage function time is programmed to avoid
*
300 s] frequent staging of the fixed speed pumps. The
stage function time starts if it is Enabled [1] by
25-27 Stage Function, and when the variable
speed pump is running at Motor Speed High Limit,
4-13 Motor Speed High Limit [RPM] or 4-14 Motor
Speed High Limit [Hz], 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 25-30 Destage Function Time will
not be activated.
[0] Disabled
[1] Enabled
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