Danfoss VLT AQUA Drive FC 202 Programming Manual page 230

Parameter Description
27-27 Min Speed Destage Delay
Range:
3 3
F VLT pump
F
min
(4-12)
Illustration 3.102 Destage Function Time
3.24.7 27-3* Staging Speed
Parameters for configuring the master/slave control
response.
27-30 Auto Tune Staging Speeds
Option:
[0] Disabled
[1] Enabled When this option is selected, the frequency
*
27-31 Stage On Speed [RPM]
Range:
Size [ 0 - par.
related 4-13
*
RPM]
228
VLT
Function:
turning off a pump if all variable speed
pumps are operating at minimum speed, but
the feedback is still within the specified band.
Under these conditions, a pump may be
turned off and the system is still able to
maintain control. The pumps that remain on
operate more efficiently.
Pump
switch-off
Destage
timer period
(27-27)
Function:
converter calculates and keeps parameters 27-31
to 27-34 up to date. If parameter 27-31 Stage On
Speed [RPM], parameter 27-32 Stage On Speed [Hz],
parameter 27-33 Stage Off Speed [RPM], and
parameter 27-34 Stage Off Speed [Hz] are modified
via the fieldbus or LCP, then the new values are
used but are continuously automatically tuned.
The frequency converter recalculates and updates
the parameters when staging occurs and
optimizes the settings to ensure high
performance and low energy consumption.
Function:
To be used if RPM is selected.
If the lead pump is operating above Stage
On Speed for the time specified in
parameter 27-23 Staging Delay and a
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®
AQUA Drive FC 202
27-31 Stage On Speed [RPM]
Range:
Illustration 3.103 SBW Staging Delay
Illustration 3.104 SBW Destaging Delay
27-32 Stage On Speed [Hz]
Range:
Size
related
*
27-33 Stage Off Speed [RPM]
Range:
Size
related
*
27-34 Stage Off Speed [Hz]
Range:
Size
related
*
Function:
variable speed pump is available, it is
turned on.
(27-24) SBW destage delay
(27-20)
Setpoint
(27-20)
Function:
[ 0 - If the lead pump speed is exceeding the
par. 4-14 value in this parameter for the time
Hz] specified in parameter 27-23 Staging Delay
and a variable speed pump is available,
the variable pump is turned on.
Function:
[ 0 - If the lead pump speed is lower than the
1500 value in this parameter for the time
RPM] specified in parameter 27-24 Destaging
Delay and more than 1 variable speed
pump is on, a variable speed pump is
turned off.
Function:
[ 0.0 - If the lead pump speed is lower than the
50 Hz] value in this parameter for the time
specified in parameter 27-24 Destaging Delay
SBW
SBW
MG20OB02