Danfoss VLT AQUA Programming Manual page 239

®
VLT AQUA Drive Programming Guide
25-52 Alternation Time Interval
Range:
*
24 h
25-53 Alternation Time Value
Option:
25-54 Alternation Predefined Time
Range:
00:00
25-55 Alternation if Capacity < 50%
Option:
[0]
*
[1]
25-56 Staging Mode at Alternation
Option:
*
[0]
[1]
Function:
[1 – 999 h] If
25-51, is selected, the alternation of the variable speed pump
takes place every time the Alternation Time Interval expires
(can be checked out in
Function:
0 N/A Readout parameter for the Alternation Time Interval value set
in par. 25-52.
Function:
*
[00:00 – 23:59] If option
selected, the variable speed pump alternation is carried out ev-
ery day at the specified time set in Alternation Predefined Time.
Default time is midnight (00:00 or 12:00AM depending on the
time format).
Function:
Disabled
Enabled If Alternation If Capacity <50% is enabled, the pump alternation
can only occurs if the capacity is equal to or below 50%. The
capacity calculation is the ratio of running pumps (including the
variable speed pump) to the total number of available pumps
(including variable speed pump, but not those interlocked).
Capacity
For the Basic Cascade Controller all pumps are equal size.
Disabled
pump capacity.
Enabled
the numbers of pumps running are providing less than 50% of
total pump capacity.
Only valid if par. 25-50,
Off
Function:
Slow
Quick This parameter is only active if the option selected in
Alternation
Two types of staging and destaging of pumps are possible. Slow
transfer makes staging and destaging smooth. Quick Transfer
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Alternation Time Interval
[1] option in
Alternation Timer Value
Predefined Time
[3] in
N
RUNNING
= × 100 %
N
TOTAL
[0]: The lead pump alternation will take place at any
[1]: The lead pump function will be alternated only if
Lead Pump Alternation
[0].
, par. 25-50, is different from
2. Parameter Description
Alternation Event
, par.
, par. 25-53).
Alternation Event
, par. 25-51, is
is different from
Lead Pump
Off [0]
2
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