Danfoss VLT Automation VT Drive FC 322 Programming Manual page 251

VLT Automation VT Drive FC322
Programming Guide
2.21.5 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:
[0] * Off
[1] At staging
[2] At command
[3] At staging or command
NB!
It is not possible to select other than
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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 choosing 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 [0] if par. 25-02 Motor Start
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-pro-
grammed event. See par. 25-51 Alternation Event
Alternation of the variable speed (lead) pump will take place at staging or the "At Command" signal.
(See above.)
Off [0] if par. 25-05 Fixed Lead Pump
MG.20.W1.22 - VLT is a registered Danfoss trademark
2 Parameter Description
is set other than Direct on Line [0].
for available options.
is set to Yes [1].
2
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