Danfoss VLT FC 100 Series Programming Manual page 217

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VLT HVAC Drive Programming Guide
3.23.5. 25-5* Alternation Settings
Parameters for defining the conditions for alternation of the variable speed pump (lead), if selected as part of the control strategy.
25-50 Lead Pump Alternation
Option:
*
Off
[0]
[1] At Staging
[2] At Command
[3] At Staging or at Com-
mand
NB!
It is not possible to select other than
Function:
Lead pump alternation equalizes the use of pumps by periodically changing the pump that is speed controlled.
This ensures that pumps are equally used over time. Alternation equalizes the usage of pumps by always choos-
ing the pump with the lowest number of used hours to stage on next.
No alternation of lead pump function will take place. It is not possible to set this parameter to options other that
Off par. 25-03, Motor Start
[0] if , is set other than
Alternation of the lead pump function will take place when staging another pump.
Alternation of the lead pump function will take place at an external command signal or a pre-programmed event.
par. 25-51, Alternation Event
See , for available options.
Alternation of the variable speed (lead) pump will take place at staging or the "At Command" signal. (See above.)
Off par. 25-05, Fixed Lead Pump
[0] if
MG.11.C5.02 - VLT ® is a registered Danfoss trademark
3. Parameter Description
Direct on Line
[0].
Yes
, is set to [1].
3
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