Danfoss VLT AQUA Drive FC 202 Programming Guide

27-27 Min Speed Destage Delay
Range: Function:
turning o a pump if all variable speed
pumps are operating at minimum speed, but
the feedback is still within the specied band.
Under these conditions, a pump may be
turned o and the system is still able to
maintain control. The pumps that remain on
operate more eciently.
e75za640.12
(4-12)
(27-27)
F
min
F
VLT pump
Destage
timer period
Pump
switch-off
Illustration 3.102 Destage Function Time
3.24.7 27-3* Staging Speed
Parameters for conguring the master/slave control
response.
27-30 Auto Tune Staging Speeds
Option: Function:
[0] Disabled
[1] * Enabled When this option is selected, the frequency
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 O Speed [RPM], and
parameter 27-34 Stage O Speed [Hz] are modied
via the eldbus 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.
27-31 Stage On Speed [RPM]
Range: Function:
Size
related*
[ 0 - par.
4-13
RPM]
To be used if RPM is selected.
If the lead pump is operating above Stage
On Speed for the time specied in
parameter 27-23 Staging Delay and a
27-31 Stage On Speed [RPM]
Range: Function:
variable speed pump is available, it is
turned on.
Illustration 3.103 SBW Staging Delay
175ZA671.11
(27-24) SBW destage delay
SBW
SBW
Setpoint
(27-20)
(27-20)
Illustration 3.104 SBW Destaging Delay
27-32 Stage On Speed [Hz]
Range: Function:
Size
related*
[ 0 -
par. 4-14
Hz]
If the lead pump speed is exceeding the
value in this parameter for the time
specied in parameter 27-23 Staging Delay
and a variable speed pump is available,
the variable pump is turned on.
27-33 Stage O Speed [RPM]
Range: Function:
Size
related*
[ 0 -
1500
RPM]
If the lead pump speed is lower than the
value in this parameter for the time
specied in parameter 27-24 Destaging
Delay and more than 1 variable speed
pump is on, a variable speed pump is
turned o.
27-34 Stage O Speed [Hz]
Range: Function:
Size
related*
[ 0.0 -
50 Hz]
If the lead pump speed is lower than the
value in this parameter for the time
specied in parameter 27-24 Destaging Delay
Parameter Description
VLT
®
AQUA Drive FC 202
228 Danfoss A/S © 05/2018 All rights reserved. MG20OB02
33

Danfoss VLT AQUA Drive FC 202 Specifications

General

Brand	Danfoss
Model	VLT AQUA Drive FC 202
Category	DC Drives
Language	English