Danfoss Metasys N2 Programming Guide

3.23 Parameters: 25-** Cascade Controller
Parameters for conguring the basic cascade controller for sequence control of multiple pumps. For a more application-
oriented description and wiring examples, see Application Examples, Cascade Controller in the design guide.
To congure the cascade controller to the actual system and the desired control strategy, follow the sequence, starting with
parameter group 25-0* System Settings and next parameter group 25-5* Alternation Settings. These parameters can normally
be set in advance.
Parameters in 25-2* Bandwidth Settings and 25-4* Staging Settings often depend on the dynamic of the system and nal
adjustment to be d1 at the commissioning of the plant.
NOTICE
The cascade controller is supposed to operate in closed loop controlled by the built-in PI controller ([3] closed loop
selected in parameter 1-00 Conguration Mode). If [8] open loop is selected in parameter 1-00 Conguration Mode, all
xed speed pumps are destaged, but the variable speed pump is still controlled by the frequency converter, now as an
open-loop conguration:
130BA279.12
2 32
O
At
staging
At
command
At staging
or
command
External
Alt. timer
interval
P 25-52
Sleep
mode
Predened
timer
P 25-54
Disabled Enabled
Slow Quick
No Yes
Disabled Enabled
Direct on line
EnabledDisabledCascade controller (P 25-00):
Number of pumps (P 25-06):
Motor start (P 25-02):
Pump cycling (P 25-04):
Fixed lead pump (P 25-05):
Lead pump alternation (P 25-50):
Alternation Event (P 25-51):
Alt. if capacity<50% (P 25-55):
Staging mode at alternation (P 25-56):
Cong. of cascade controller
Soft Starter
Conguration mode (P 1-00):
Open Loop
Closed Loop
Illustration 3.67 Cascade Controller Sample Set-up
Parameter Descriptions
VLT
®
HVAC Drive FC 102
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33

Danfoss Metasys N2 Specifications

General

Brand	Danfoss
Model	Metasys N2
Category	DC Drives
Language	English