NOTE!
These parameters can be used with Vacon NXP drive only.
EXAMPLE:
Motor Control Mode = 3 (Closed loop speed control)
This is the usual operation mode when fast response times, high accuracy or controlled run
at zero frequencies are needed. Encoder board should 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
ID612 or perform the ID run without load on motor shaft and set parameter ID619 (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 (ID112) is
critical. The Current Limit parameter (ID107) controls the available torque linearly in relative
to motor nominal current.
8.9
"TERMINAL TO FUNCTION" (TTF) PROGRAMMING PRINCIPLE
The programming principle of the input and output signals in the Multipurpose 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),
you have a fixed input or output that you define a certain function for. The applications
mentioned above, 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 input/output for. See Warning in Chapter
8.9.2 Defining a terminal for a certain function with NCDrive programming tool.
8.9.1
DEFINING AN INPUT/OUTPUT FOR A CERTAIN FUNCTION ON KEYPAD
Connecting a certain input or output with a certain function (parameter) is done by giving the
parameter an appropriate value. The value is formed of the Board slot on the Vacon NX
control board (see the product's User Manual) and the respective signal number, see below.
READY
I/Oterm
DigOUT:B.1
AI Ref Faul/Warn
A
B
C D
Fig. 94: Defining an input/output for a certain function on keypad
A. Function name
B. Terminal type
C. Slot
D. Terminal number
VACON · 374
PARAMETER DESCRIPTIONS
8
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