Danfoss vlt aqua Programming Guide

[2] At Command
[3] At Staging or at Com-
mand
Lead pump alternation equalizes the use of pumps by periodi-
cally 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.
Off [0]: No alternation of lead pump function will take place. It
is not possible to set this parameter to options other that
Off [0]
if
Motor Start , par. 25-03, is set other than Direct on Line [0].
NB!
It is not possible to select other than
Off [0] if
Fixed Lead Pump , par. 25-05, is set to Yes [1].
At Staging [1]: Alternation of the lead pump function will take
place when staging another pump.
At Command [2]: Alternation of the lead pump function will take
place at an external command signal or a pre-programmed
event. See
Alternation Event , par. 25-51, for available options.
At Staging or at Command [3]: Alternation of the variable speed
(lead) pump will take place at staging or the “At Command”
signal. (See above.)
25-51 Alternation Event
Option: Function:
[0]
*
External
[1] Alternation Time In-
terval
[2] Sleep Mode
[3] Predefined Time This parameter is only active if the options
At Command [2] or
At Staging or Command [3] have been selected in Lead Pump
Alternation
, par. 25-50. If an Alternation Event is selected, the
alternation of lead pump takes place every time the event oc-
curs.
External [0]: Alternation takes place when a signal is applied to
one of the digital inputs on the terminal strip and this input has
been assigned to
Lead Pump Alternation [121] in Digital In-
puts
, par. 5-1*.
Alternation Time Interval [1]: Alternation takes place every time
Alternation Time Interval , par. 25-52, expires.
Sleep Mode [2]: Alternation takes place each time the lead
pump goes into sleep mode.
No-Flow Function , par. 20-23, must
be set to
Sleep Mode [1] or an external signal applied for this
function.
Predefined Time [3]: Alternation takes place at a defined time
of the day. If
Alternation Predefined Time , par. 25-54, is set, the
alternation is carried out every day at the specified time. Default
time is midnight (00:00 or 12:00AM depending on the time for-
mat).
2. Parameter Description VLT
®
AQUA Drive Programming Guide
238 MG.20.O2.02 - VLT
®
is a registered Danfoss trademark
2

Danfoss vlt aqua Specifications

General

Supply Voltage	200-240V, 380-500V, 525-600V
Enclosure	IP20
Features	Energy optimization
Approvals	CE, UL, cUL
Input Voltage Range	200-240V, 380-500V, 525-600V
Output Voltage Range	0 to supply voltage
Protection Features	Overvoltage, Undervoltage, Overcurrent, Short circuit, Ground fault
Communication Interfaces	PROFIBUS
Cooling Method	Air-cooled