Danfoss VLT AQUA Programming Manual page 229

®
VLT AQUA Drive Programming Guide
25-05 Fixed Lead Pump
Option:
[0]
*
[1]
25-06 Number of Pumps
Option:
*
[0]
[1]
2.21.3. 25-2* Bandwidth Manager
Parameters for setting the bandwidth within which the pressure will be allowed to operate before
staging/destaging fixed speed pumps. Also includes various timers to stabilize the control.
Function:
No
Yes
Fixed Lead Pump means that the variable speed pump is con-
nected directly to the frequency converter and if a contactor is
applied between frequency converter and pump, this contactor
will not be controlled by the frequency converter.
If operating with
than
No [0]: The lead pump function can alternate between the
pumps controlled by the two built in relays. One pump must be
connected to the built-in RELAY 1, and the other pump to RELAY
2. The pump function (Cascade Pump1 and Cascade Pump2)
will automatically be assigned to the relays (maximum two
pumps can in this case be controlled from the frequency con-
verter).
Yes
[1]: The lead pump will be fixed (no alternation) and con-
nected directly to the frequency converter. The
Alternation
relays Relay 1 and Relay 2 can be assigned to separate fixed
speed pumps. In total three pumps can be controlled by the
frequency converter.
Function:
2 pumps
3 pumps
The number of pumps connected to the Cascade Controller in-
cluding the variable speed pump. If the variable speed pump is
connected directly to the frequency converter and the other
fixed speed pumps (lag pumps) are controlled by the two built
in relays, three pumps can be controlled If both the variable
speed and fixed speed pumps are to be controlled by built-in
relays, only two pumps can be connected.
2 Pumps
one variable speed pump and one fixed speed pump; both con-
trolled by built in relay. If
Yes
to
controlled by built-in relay
3 Pumps
Two fixed speed pumps controlled by built-in relays.
®
MG.20.O2.02 - VLT is a registered Danfoss trademark
Lead Pump Alternation
Off
[0], this parameter must be set to
, par. 25-50, is automatically set to
Fixed Lead Pump
[0]: If , par. 25-05, is set to
Fixed Lead Pump
[1]: one variable speed pump and one fixed speed pump
[1]: One lead pump, see
2. Parameter Description
, par. 25-50, set to other
No
[0].
Lead Pump
Off
[0]. Built-in
No
[0]:
, par. 25-05, is set
Fixed Lead Pump
, par. 25-05.
2
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