Chapter 6 – Parameters
ACH 500 Programming Manual
6-41
Main 40 Application
Parameters
Group 40.1
PI-Controller
These parameters can only be seen when you select the HVAC-PI macro.
These parameter values can be altered with the ACH 500 running, except
those marked with (O). The Range/Unit column in Table 6-21 shows
parameter values. The text following the table explains parameter values in
detail.
Table 6-21 Group 40.1
The PI Controller allows the ACH 500 to take a reference signal (setpoint)
and an actual signal (feedback), and automatically adjust the output frequency
of the drive to match the actual signal to the reference.
1 PI-CONT GAIN
This parameter defines the gain of the PI-Controller included in the
Application macros of the ACH 500. Setting range is 3 – 800%. If you select
100%, a 10% change in error value causes controller output to change by 1.5
Hz.
Parameter
Range/Unit
Description
1 PI-CONT GAIN
3 – 800%
PI-Controller Gain selection.
2 PI-CONT I-TIME
0.02 – 320.00s
PI-Controller I-time selection.
3 PI-CONT MIN LIMIT
0 – 120 Hz
PI-Controller output freq.
minimum limit.
4 PI-CONT MAX LIMIT
0 – 120 Hz
PI-Controller output freq.
maximum limit.
5 ERROR VALUE
INVERT
NO/YES
PI-Controller error value
inversion.
6 ACTUAL VALUE
SEL (O)
ACT1/ACT1 - ACT2/
ACT+ACT2/
ACT1*ACT2
PI-Controller output signal
selection.
7 ACTUAL 1 INPUT (O)
AI1/AI2
Actual 1 signal input selection.
8 ACTUAL 2 INPUT (O)
AI1/AI2
Actual 2 signal input selection.
9 ACT 1 MIN SCALE
-1600.0 – +1600.0%
Minimum scaling factor of the
Actual 1.
10 ACT 1 MAX SCALE
-1600.0 – +1600.0%
Maximum scaling factor of the
Actual 1.
11 ACT 2 MIN SCALE
-1600.0 – +1600.0%
Minimum scaling factor of the
Actual 2.
12 ACT 2 MAX SCALE
-1600.0 – +1600.0%
Maximum scaling factor of the
Actual 2.
