Section 4. Configuration of the frequency converter
4.2.7. Configuration of digital and analog inputs and outputs
Digital inputs
Frequency converter has 6 digital inputs designated DI1...DI6 (in the control panel they are named
In.C1...In.C6). Applying 24V voltage on any digital input (terminal strip – fig. 2.6) sets it in a logic state 1. Current state of
digital inputs can be read on parameter 0.48 (fig. 4.7a - "110000" means that voltage 24V is sent on DI1 and DI2).
A
LO
LO
(1..6)
110000
0 View
0.48 DI state
A
LO
LO
(1..4)
0000
0 View
0.49 DO state
a)
b)
Fig. 4.7 - Digital inputs state (a) and outputs state (b)
A
LO
LO
003 In.C3
2.1 B Ctrl.unit
2 Refer. & control
Fig. 4.8 - Choice of control variant A/B
using DI3
Digital inputs have no parameters which define their function. Such function is determined only for “remote
start” (see table 4.1) and also “thermal blocking” for DI6 - see section 4.4.4.2. In other cases the digital input "is
selected" for using the certain functions using parameters which are connected to the given function of the frequency
converter. An example to choose control variant A or B using DI3 it is necessary to set up par. 2.1 (which makes choice
of control variant) on value “
003 In.C3
” as it is shown in fig. 4.8. It means that there is a possibility of giving to this digital
input simultaneously more than one function. (Other parameter can be set up also on value “
003 In.C3
”).
Analog inputs
Frequency converter has three analog inputs AI0, AI1 and AI2 (in the control panel they are named In.A0, In.A1
and In.A2). Two of them (AI1 and AI2) can operate both in voltage mode 0(2)..10V and in current mode 0(4)..20mA. The
choice of an operating mode for these inputs is carried out by switches J3 i J4. Input АI0 can work only in voltage mode.
It is possible to connect directly a potentiometer or a voltage (current) source to analog inputs - see fig. 2.7. Table 4.3
compares the parameters responsible for a configuration of the analog inputs. By analogy to digital inputs, analog inputs
have no parameters which define their function in the system. Inputs are selected by control configuration parameters to
perform certain actions (fig. 4.9).
Note: in order to set the configuration shown in Fig. 4.9b, it is necessary to activate the “full pointers” - see
chapter 11.3 “Modifying the standard control”.
A
A1
LO
135 In.A1
2.2 Ref.unit A
2 Refer. & control
A
FU
LO
145 Ref.A1
2.2 Ref.unit A
2 Refer. & control
a)
b)
Fig. 4.9 - Analog input AI1 (a) or Analog Referencing-unit Ref.A1 (b)
are chosen for speed control of motor rotation in control variant A
Table 4.3 - Parameters defining a configuration of analog inputs
Parameter
Function
Description
2.40
Configuration of AI0
range
Choice of range for input value 0...10V, 2...10V, 10...0V (inversion), 10...2V.
2.41
Configuration of AI1
range
Voltage/current mode:
0-10V / 0-20mA, 10-0V / 20-0mA, 2-10V / 4-20mA, 10-2V / 20-4mA
Voltage/current mode selection is done by J3 and J4 jumpers (fig. 2.6).
The range configuration is done by software settings (par. 2.41 and 2.42).
Displayed marks 0-10V, 10-0V, 2-10V and 10-2V are common for both modes, it means that
after changing the jumper setting to current mode, displayed 0-10V means 0-20mA, 10-0V
means 20-0mA, 2-10V means 4-20mA and 10-2V means 20-4mA.
Example: to set the AI1 in current mode with 4-20mA range you need:
1. Set the mode selection jumper (fig. 2.6).
2. Set the 2-10V in par. 2.41.
2.42
Configuration of AI2
range
2.49
Constant of time for
lowpass filter AI0
time [s]
[V] [%]
filtered value
of AI0
AI0 input voltage
100%
63%
time constant
2.50
Constant of time for
lowpass filter AI1
2.51
Constant of time for
lowpass filter AI2
0.40
Value AI0 [%]
READ ONLY. Value AI0 in [%], e.g. for range 0..10V voltage 5V corresponds par. 0.40=50.0 %
0.41
Value AI1 [%]
READ ONLY. Value AI1 in [%], e.g. for range 0..10V voltage 5V corresponds par. 0.41 =50.0%
0.42
Value AI2 [%]
READ ONLY. Value AI2 in [%], e.g. for range 0..10V voltage 5V corresponds par. 0.42 =50.0%
3.23
Reaction to signal
absence at the Analog
Input
In operating modes 2..10V, 10..2V, 4..20mA and 20..4mA it is possible to define behavior of the
drive when value of voltage falls below 1V or value of a current falls below 2mA (see
Appendix C - par. 3.23).
Frequency converter MFC710 type. TWERD Power Electronics
33
