Danfoss vlt aqua Programming Guide

25-05 Fixed Lead Pump
Option: Function:
[0] No
[1]
*
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
Lead Pump Alternation , par. 25-50, set to other
than
Off [0], this parameter must be set to No [0].
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
Lead Pump
Alternation
, par. 25-50, is automatically set to Off [0]. Built-in
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.
25-06 Number of Pumps
Option: Function:
[0]
*
2 pumps
[1] 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 [0]: If Fixed Lead Pump , par. 25-05, is set to No [0]:
one variable speed pump and one fixed speed pump; both con-
trolled by built in relay. If
Fixed Lead Pump , par. 25-05, is set
to
Yes [1]: one variable speed pump and one fixed speed pump
controlled by built-in relay
3 Pumps [1]: One lead pump, see Fixed Lead Pump , par. 25-05.
Two fixed speed pumps controlled by built-in relays.
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.
VLT
®
AQUA Drive Programming Guide 2. Parameter Description
MG.20.O2.02 - VLT
®
is a registered Danfoss trademark 229
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