Danfoss VLT AQUA Drive FC 200 Programming Manual page 174

Parameter Description
3.22.1 25-0* System Settings
Parameters related to control principles and configuration
of the system.
3 3
25-00 Cascade Controller
Option:
[0] Disabled The Cascade Controller is not active. All built-in
[1] Enabled The cascade controller is active and will stage/
25-02 Motor Start
Option:
[0] Direct on
Line
[1] Soft Starter Each fixed-speed pump is connected to line via
[2] Star-Delta
25-04 Pump Cycling
Option:
[0] Disabled The fixed-speed pumps will be connected in the
[1] Enabled The fixed-speed pumps will be connected/discon-
3-148
Function:
For operation of multiple devices (pump/fan)
systems where capacity is adapted to actual load
by means of speed control combined with on/off
control of the devices. For simplicity, only pump
systems are described.
relays assigned to pump motors in the cascade
function will be de-energized. If a variable-speed
pump is connected to the adjustable frequency
drive directly (not controlled by a built-in relay);
this pump/fan will be controlled as a single pump
system.
destage pumps according to load on the system.
Function:
Motors are directly connected to the line power
with a contactor or a soft starter. When the
value of 25-02 Motor Start is set to an option
other than [0] Direct on Line, then 25-50 Lead
Pump Alternation is automatically set to the
default of [0] Direct on Line.
Each fixed-speed pump is connected to line
directly via a contactor.
a soft starter.
Function:
To provide equal hours of operation with fixed-
speed pumps, the pump use can be cycled. The
selection of pump cycling is either "first in – last
out" or equal running hours for each pump.
order 1–2 and disconnected in the order 2–1. (First
in–last out).
nected to have equal running hours for each
pump.
MG20O622 - VLT
®
VLT AQUA Drive Programming Guide
25-05 Fixed Lead Pump
Option: Function:
[0] No
[1] Yes The lead pump will be fixed (no alternation) and
25-06 Number Of Pumps
Range:
2 [ 2 -
*
9 ]
®
is a registered Danfoss trademark
Fixed Lead Pump means that the variable-speed pump
is connected directly to the adjustable frequency drive,
and if a contactor is applied between adjustable
frequency drive and pump, this contactor will not be
controlled by the adjustable frequency drive.
If operating with 25-50 Lead Pump Alternation set to
other than [0] Off, this parameter must be set to [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 adjustable frequency drive).
connected directly to the adjustable frequency drive.
The 25-50 Lead Pump Alternation is automatically set to
[0] Off. Built-in relays Relay 1 and Relay 2 can be
assigned to separate fixed-speed pumps. A total of
three pumps can be controlled by the adjustable
frequency drive.
Function:
The number of pumps connected to the Cascade
Controller including the variable-speed pump. If the
variable-speed pump is connected directly to the
adjustable frequency drive 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.
If 25-05 Fixed Lead Pump, is set to [0] No: one
variable-speed pump and one fixed-speed pump;
both controlled by built-in relay. If 25-05 Fixed Lead
Pump is set to [1] Yes: one variable-speed pump and
one fixed-speed pump controlled by built-in relay.
One lead pump, see 25-05 Fixed Lead Pump. Two
fixed-speed pumps controlled by built-in relays.