Staging Settings - Danfoss VLT Series Operating Instructions Manual

®
VLT Operating Instructions
27-33 Stage Off Speed (RPM)
Range:
par. 4-11* [par. 4-11 – par. 4-13]
27-34 Stage Off Speed (Hz)
Range:
par. 4-12* [par. 4-12 – par. 4-14]

1.8.6 Staging Settings, 27-4*

Parameters for configuring staging transitions.
27-40 Auto Tune Staging Settings
Option:
[0] * Disabled
[1] Enabled
27-41 Ramp Down Delay
Range:
10 s* [0 – 120 s]
NB!
Also used in star/delta pumps.
27-42 Ramp Up Delay
Range:
2 s* [0 s – 12 s]
Function:
If the lead pump is operating below Stage Off Speed for the time specified in De-staging Delay (par.
27-24), and more than one variable speed pump is on, a variable speed pump will be turned off.
Function:
If the lead pump is operating below Stage Off Speed for the time specified in De-staging Delay (par.
27-24), and more than one variable speed pump is on, a variable speed pump will be turned off.
Function:
When enabled the staging and de-staging threshold will be auto tuned during operation. The set-
tings will be optimized in order to prevent pressure over and undershoots when staging and de-
staging.
Staging or de-staging threshold.
Function:
Ramp Down Delay sets the delay between turning on a soft starter controlled pump and ramping
down the drive controlled pump. This is only used for soft starter and star/delta controlled pumps.
Function:
Sets the delay between turning off a soft starter controlled pump and ramping up the drive controlled
pump. This is only used for soft starter controlled pumps.
®
MI.38.C3.02 - VLT is a registered Danfoss trademark
1 Extended and Advanced Cascade Controller
Option
1
31