Danfoss VLT AQUA Drive FC 202 Programming Manual page 231

Parameter Description
27-34 Stage Off Speed [Hz]
Range: Function:
and more than 1 variable speed pump is
on, a variable speed pump is turned off.
3.24.8 27-4* Staging Settings
Parameters for configuring the staging transitions.
27-40 Auto Tune Staging Settings
When this parameter is enabled, the staging and destaging
threshold is auto tuned during operation. The settings are
optimized to prevent the pressure from overshooting or
undershooting when staging and destaging pumps.
Option:
[0] Disabled
*
[1] Enabled
27-41 Ramp Down Delay
Range: Function:
10 s [0 - 120 Enter the delay between turning on a pump
*
s] controlled by a soft starter and ramping down
a pump controlled by the frequency converter.
This parameter is only used for soft starter and
star/delta controlled pumps.
(27-41)
Illustration 3.105 Ramp Down Delay
27-42 Ramp Up Delay
Range: Function:
2 s [0 - 12 Enter the delay between turning off a pump
*
s] controlled by a soft starter and ramping up a
pump controlled by the frequency converter.
This parameter is only used for soft starter
controlled pumps.
NOTICE
Not used with star/delta controlled
pumps.
MG20OB02
Programming Guide
Illustration 3.106 Ramp Up Delay
Function:
27-43 Staging Threshold
Range:
Size
related
Motor speed
Staging speed
(27-43)
Motor speed
Illustration 3.107 Staging Threshold
27-44 Destaging Threshold
Range:
Size
related
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(27-42)
Function:
[ 0 - Enter the speed in the staging ramp at which
100 the fixed speed pump is turned on. The value is
*
%] a percentage of the maximum pump speed.
If parameter 27-40 Auto Tune Staging Settings is
set to [1] Enabled, parameter 27-43 Staging
Threshold and parameter 27-44 Destaging
Threshold are kept up to date with the new
calculated values. If parameter 27-43 Staging
Threshold and parameter 27-44 Destaging
Threshold are modified via the fieldbus or the
LCP, then the new values are used, but are
continuously automatically tuned.
Fixed speed pump
high
low
Closed loop
Function:
[ 0 - Enter the speed in the staging ramp at which
100 the fixed speed pump is turned off. The value is
*
%] a percentage of the maximum pump speed.
If parameter 27-40 Auto Tune Staging Settings is
set to [1] Enabled, parameter 27-43 Staging
Threshold and parameter 27-44 Destaging
Threshold are kept up to date with the new
calculated values. If parameter 27-43 Staging
Threshold and parameter 27-44 Destaging
Threshold are modified via the fieldbus or the
3
Monitor feedback and
change to closed loop if
setpoint is reached
Variable speed pump
Time
229
3