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Berges electronic
•
D–51709 Marienheide-Rodt
•
Tel. 02264/17-0
•
Fax 02264/17126
Operating manual
21.12.98
ACP 3000 — 0.37–15.0
04_GB
54
This means that a voltage divider scaled to 0.0987 must be used if a maximum input voltage
of 10 V is desired. Since voltage dividers are rarely exact, parameter
B5-KIN
can be used
to compensate. In this case, the divider gain was actually 0.100. This means that the input
will be off scale by a factor of 1.01 which can be compensated by scaling to 0.987 or
B5-
KIN
set to 126. See page 54 for an equation for calculating
B5-KIN
.
NOTE: Setting
B5-KIN
less than 128 or a scale less than 1 will limit the maximum speed
that the feedback terminal can read and therefore could cause unpredictable results. See
page 54 for an equation for calculating the maximum feedback terminal.
6.4
Calculating PI Controller Values
The integral part of the PI controller output is calculated as follows:
N = 1 for fast integrator, 64 for slow integrator.
e = Fout-Feedback (error signal calculated by PI Controller).
kP, kI, kIN = 0–255.
Actual output speed of PI controller is calculated as follows:
To calculate maximum feedback:
To calculate actual feedback:
FIN is % of full scale voltage or current.
To calculate
B5-KIN
(calculated voltage scaling ratio of feedback signal):
P
V
= Process Parameter in Volts/RPM.
V
MAX
= Maximum input Voltage (5 V or 10 V).
A
DIVA
= Actual Voltage Divider Ratio.
6.5
Parameters for PI Control
A.
Additional Parameters for PI Control
The following parameters become available when PI control is enabled; they are not avail-
able when PI control is not utilized.
sIPart:
sIPart
kI
e
×
8192
N
×
-----------------------
+
=
Actual Output Speed
sIPart
kP
e
×
128
-----------------
+
=
Maximum Feedback
kIN
128
----------
9
FMAX
×
8
---------------------------
×
=
Actual Feedback
Fin
kIN
128
----------
×
9
FMAX
×
8
---------------------------
×
=
A
DIV
V
MAX
33.75
FMAX
×
P
V
×
[
]
---------------------------------------------------------
=
K
IN
128
A
DIV
V
DIVA
----------------
×
=
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