Danfoss VLT FC 100 Series Programming Manual page 210

3. Parameter Description
25-00 Cascade Controller
Option:
* Disabled
[0]
3
[1] Enabled
25-02 Motor Start
Option:
*
Direct on Line
[0]
[1] Soft starter
25-04 Pump Cycling
Option:
* Disabled
[0]
[1] Enabled
25-05 Fixed Lead Pump
Option:
[0] No
*
Yes
[1]
25-06 Number of Pumps
Option:
*
2 pumps
[0]
210
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
Motor Start
, is set to an option other than
Direct on Line
matically set to the default of
Each fixed speed pump is connected to line directly via a contactor.
Each fixed speed pump is connected to line 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.
The fixed speed pumps will be connected in the order 1 – 2 and disconnected in the order 2 – 1. (First in – last
out).
The fixed speed pumps will be connected/disconnected to have equal running hours for each pump.
Function:
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 fre-
quency converter.
par. 25-50, Lead Pump Alternation
If operating with
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 converter).
The lead pump will be fixed (no alternation) and connected directly to the frequency converter. The
Lead Pump Alternation , is automatically set to
separate fixed speed pumps. In total three pumps can be controlled by the frequency converter.
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.
par. 25-05, Fixed Lead Pump
If , is set to
par. 25-05, Fixed Lead Pump
controlled by built in relay. If
fixed speed pump controlled by built-in relay.
MG.11.C5.02 - VLT ® is a registered Danfoss trademark
®
VLT HVAC Drive Programming Guide
Direct on Line par. 25-50, Lead Pump Alternation
[0], then
[0].
Off
, set to other than [0], this parameter must be set to
Off [0]. Built-in relays Relay 1 and Relay 2 can be assigned to
No
[0]: one variable speed pump and one fixed speed pump; both
Yes
, is set to [1]: one variable speed pump and one
par. 25-02,
, is auto-
par. 25-50,