27-31 Stage On Speed [RPM]
Range:
Function:
in
27-23 Staging Delay
and a variable
speed pump is available, it will be
turned on.
Illustration 5.7
175ZA671.11
(27-24) SBW destage delay
SBW
SBW
Setpoint
(27-20)
(27-20)
Illustration 5.8
27-32 Stage On Speed [Hz]
Range:
Function:
Size
related
*
[ 0 - par.
4-14 Hz]
To be used if Hz is chosen.
If the lead pump is operating above
Stage On Speed for the time specified
in
27-23 Staging Delay
and a variable
speed pump is available, it will be
turned on.
27-33 Stage Off Speed [RPM]
Range:
Function:
Size
related
*
[ 0 -
1500 RPM]
If the lead pump is operating below
Stage Off Speed for the time specified
in
27-24 Destaging Delay
and more than
one variable speed pump is on, a
variable speed pump will be turned off.
27-34 Stage Off Speed [Hz]
Range:
Function:
Size
related
*
[ 0.0 -
50 Hz]
If the lead pump is operating below
Stage Off Speed for the time specified in
27-34 Stage Off Speed [Hz]
Range:
Function:
27-24 Destaging Delay
and more than
one variable speed pump is on, a
variable speed pump will be turned off.
5.1.7 Staging Settings, 27-4*
Parameters for configuring staging transitions.
27-40 Auto Tune Staging Settings
When enabled the staging and de-staging threshold will be auto
tuned during operation. The settings will be optimized in order
to prevent pressure over and undershoots when staging and de-
staging.
Option:
Function:
[0]
Disabled
Staging or de-staging
threshold.
[1]
Enabled
27-41 Ramp Down Delay
Range:
Function:
10 s
*
[0 - 120
s]
Ramp Down Delay sets the delay between
turning on a soft starter controlled pump and
ramping down the frequency converter
controlled pump. This is only used for soft
starter and star/delta controlled pumps.
(27-41)
130BA598.11
Illustration 5.9
NOTICE
Also used in star/delta pumps.
27-42 Ramp Up Delay
Range:
Function:
2 s
*
[0 - 12 s] Sets the delay between turning off a soft starter
controlled pump and ramping up the frequency
converter controlled pump. This is only used for
soft starter controlled pumps.
Parameter Descriptions
VLT
®
AQUA Drive MCO 101/MCO 102
MI38C402 - VLT
®
is a registered Danfoss trademark
29
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