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8 Pump and Fan Control Application
8.1 Introduction to Pump and Fan Control Application
Select the Pump and Fan Control Application in menu
M6
on page
S6.2
.
The Pump and Fan Control Application can be used to control one variable speed drive and up to four auxiliary drives. The PID
controller of the AC drive controls the speed of the variable speed drive. It gives control signals to start and stop the auxiliary drives
to control the total flow. In addition to the eight parameter groups provided as standard, a parameter group for multi-pump and fan
control functions is available.
The application has two control places on the I/O terminal. Place A is the pump and fan control and place B is the direct frequency
reference. The control place is selected with input DIN 6.
The Pump and Fan Control Application is used to control the operation of pumps and fans. It can be used, for example, to decrease
the delivery pressure in booster stations when the measured input pressure falls below a specified limit.
The application utilizes external contactors for switching between the motors connected to the AC drive. The autochange feature
provides the capability of changing the starting order of the auxiliary drives. Autochange between 2 drives (main drive + 1 auxiliary
drive) is set as default, see
10.629 Automatic Changing Between Drives (Pump and Fan Control Application Only)
All inputs and outputs are freely programmable.
Extra functions:
Analog input signal range selection
Two frequency limit supervisions
Torque limit supervision
Reference limit supervision
Second ramps and S-shape ramp programming
Programmable Start/Stop and Reverse logic
DC brake at start and stop
Three prohibit frequency areas
Programmable U/f curve and switching frequency
Auto restart
Motor thermal and stall protection: fully programmable; off, warning, fault
Motor underload protection
Input and output phase supervision
Sleep function
The parameters of the Pump and Fan Control Application are explained in Chapter Parameter descriptions of this manual. The ex-
planations are arranged according to the individual ID number of the parameter.
AB296635287482en-000301 / DPD00903
128 | Danfoss A/S © 2023.02
Pump and Fan Control Application
VACON® NX All-in-One
Application Guide
Summary of Contents for VACON NX
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