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Programming Your Application
6-47
590+ Series DC Digital Converter
INTERNAL LINKS
Internal Links - Example
Controlling both the acceleration and deceleration times of the drive ramp
through analog input 1 (default terminal A2)
This example is similar to the first example in ANALOG INPUTS, page 6-5.
As before, the ends of the external potentiometer are connected to the drive's 0V and +10V dc
supply (terminals A1 and B3). The wiper of the potentiometer is connected to terminal A2.
The CALIBRATION parameter of ANALOG INPUT 1 (Tag 230) is set to 5.00%. This scales
the input signal (from 0.1 to 600 seconds) to 30 seconds maximum.
However, in this example INTERNAL LINK is used to allow the external potentiometer to
control
both
the acceleration and deceleration times of the ramp.
To do this:
1.
Set CONFIGURE I/O::CONFIGURE ENABLE to ENABLE.
2.
Find the tag number for RAMP ACCELTIME and RAMP DECEL TIME either from
the RAMPS function block detail in this chapter, or from the Parameter Table: MMI
Order - refer to Chapter 10. (They are 2 and 3 respectively).
3.
Set ANIN 1 (A2)::DESTINATION TAG (OUTPUT) to 2 (for RAMP ACCEL
TIME).
4.
Set ANIN 1 (A2)::CALIBRATION to 0.500 (5.00%).
5.
Set ANIN 1 (A2)::MAX VALUE to 100.00%.
6.
Set ANIN 1 (A2)::MIN VALUE to 0.00%.
7.
Exit the ANALOG INPUTS sub-menu and scroll down to INTERNAL LINKS. Enter
the INTERNAL LINKS sub-menu.
8.
Set LINK 1::SOURCE TAG to 2 (for RAMP ACCEL TIME), which is also the
destination tag for the output of the ANIN 1 (A2) function block.
9.
Set LINK1::DESTINATION TAG to 3 (for RAMP DECEL TIME).
10. Set CONFIGURE I/O::CONFIGURE ENABLE to DISABLE.
Analog Input 1 (terminal A2) now controls both the speed ramp acceleration and deceleration
times, over a range of 0 to 30 seconds. An input of 10V dc sets the ramp up and down times to
30 seconds.
Analog Input 1
OUTPUT [246]
– 2
0.0500 –
[230]
CALIBRATION
100.00 % –
[231]
MAX VALUE
0.00 % –
[232]
MIN VALUE
ANIN 1 (A2)
[ 50]
–
0.00 VOLTS
Ramps
RAMP OUTPUT
[ 85]
–
0.00 %
RAMPING
[113]
–
FALSE
10.0 s
–
[ 2]
RAMP ACCEL TIME
10.0 s
–
[ 3]
RAMP DECEL TIME
ENABLED
–
[ 4] CONSTANT ACCEL
OFF
–
[118] RAMP HOLD
FALSE
–
[620] INVERT
0.00 %
–
[ 5] RAMP INPUT
2.50 %
–
[266] % S-RAMP
0.50 %
–
[286] RAMPING THRESH.
ENABLED
–
[287] AUTO RESET
DISABLED
–
[288] EXTERNAL RESET
0.00 %
–
[422] RESET VALUE
0.00 %
–
[126] MIN. SPEED
LINK 1