Danfoss VLT AQUA Drive FC 200 Programming Manual page 167

Parameter Description
3.22.1 25-0* System Settings
Parameters related to control principles and configuration
of the system.
25-00 Cascade Controller
3 3
Option:
[0] Disabled
*
[1] Basic Cascade
Ctrl
[2] Motor
Alternation
Only
25-02 Motor Start
Option:
[0] Direct on
*
Line
[1] Soft Starter Each fixed speed pump is connected to line
[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-
166
VLT
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.
The Cascade Controller is not active. All
built-in relays assigned to pump motors in
the cascade function will be de-energized. If
a variable speed pump is connected to the
frequency converter directly (not controlled
by a built-in relay); this pump/fan will be
controlled as a single pump system.
The Cascade Controller is active and will
stage/destage pumps according to load on
the system.
Function:
Motors are connected to the mains directly
with a contactor or with 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.
via 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.
MG20O602 - VLT
®
AQUA Drive Programming Guide
25-05 Fixed Lead Pump
Option:
Fixed Lead Pump means that the variable speed pump
is connected 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 25-50 Lead Pump Alternation set to
other than [0] Off, this parameter must be set to [0]
No.
[0] No 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 automat-
ically be assigned to the relays (maximum two pumps
can in this case be controlled from the frequency
converter).
[1] Yes The lead pump will be fixed (no alternation) and
*
connected directly to the frequency converter. The
25-50 Lead Pump Alternation is automatically set to [0]
Off. Built-in relays Relay 1 and Relay 2 can be assigned
to sete fixed speed pumps. In total three pumps can
be controlled by the frequency converter.
25-06 Number of Pumps
Range:
2 [ 2 -
*
9. ]
3.22.2 25-2* Bandwidth Settings
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.
®
is a registered Danfoss trademark
Function:
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
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.
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.