Data
Value
Unit
Scale
Process Data IN2
Actual value 1 to PID controller
%
0.01%
Process Data IN3
Actual value 2 to PID controller
%
0.01%
PD4 – PD8
Not used
-
-
10.625 Closed Loop Parameters (IDs 612–621)
Select the Closed loop control mode by setting value 3 or 4 for parameter
ID 600
.
Closed loop control mode (see
10.277 (ID 600) Motor Control Mode
) is used when enhanced performance near zero speed and bet-
ter static speed accuracy with higher speeds are needed. Closed loop control mode is based on "rotor flux-oriented current vector
control". With this controlling principle, the phase currents are divided into a torque producing current portion and a magnetizing
current portion. Thus, the squirrel cage induction machine can be controlled in a fashion of a separately excited DC motor.
These parameters can be used with VACON
®
NXP drive only.
Example
Motor Control Mode = 3 (Closed loop speed control)
This mode is the usual operation mode when fast response times, high accuracy, or controlled run at zero frequencies are needed.
Encoder board must be connected to slot C of the control unit. Set the encoder P/R-parameter (
P7.3.1.1
). Run in open loop and
check the encoder speed and direction (
V7.3.2.2
). Switch the encoder wiring or the phases of motor cables if necessary. Do not run if
encoder speed is wrong. Program the no-load current to parameter
ID 612
or perform the ID run without load on motor shaft. Also,
set parameter
ID 619
(
Slip Adjust
) to get the voltage slightly above the linear U/f-curve with the motor frequency at about 66% of the
nominal motor frequency. The
Motor Nominal Speed
parameter (
ID 112
) is critical. The
Current Limit
parameter (
ID 107
) controls the
available torque linearly in relative to motor nominal current.
10.626 "Terminal to Function" (TTF) Programming Principle
The programming principle of the input and output signals in the Multi-purpose Control Application as well as in the Pump and Fan
Control Application (and partly in the other applications) is different compared to the conventional method used in other VACON
®
NX applications.
In the conventional programming method, Function to Terminal Programming Method (FTT), a certain function is defined for a
fixed input or output. The applications mentioned, however, use the Terminal to Function Programming method (TTF) in which the
programming process is carried out the other way round: Functions appear as parameters which the operator defines a certain in-
put/output for. See the warning in
10.626.2 Defining a Terminal for a Certain Function with VACON® NCDrive
AB296635287482en-000301 / DPD00903 | 311
Danfoss A/S © 2023.02
Parameter Descriptions
VACON® NX All-in-One
Application Guide
Summary of Contents for VACON NX
Page 1: ...Application Guide VACON NX All in One drives danfoss com...
Page 2: ......
