User manual - CONTROLLER PUR-94D
Calculated I
out
do not exceeds the output working range (3.8 - 21 mA).
b) D = „20.5”
According to formula from page 43:
I
out
= (20.5-10.0) / (20.0-10.0) × 16 mA + 4 mA = 1.05 ·16 + 4 = 20.08 mA
Calculated I
out
do not exceeds the output working range (3.8 - 21 mA).
c) D = „30.0”
According to formula from page 43:
I
out
= (30.0-10.0) / (20.0-10.0) × 16 mA + 4 mA = 2 ·16 + 4 = 36 mA.
Calculated I
out
exceeds the output working range (3 - 21 mA), so current output will generate
current equal to the upper border of range defined by parameter
“Lo r”
and
“Hi r”
(it means
21 mA).
Example 8:
Connecting and preparing the system for the auto-tuning process
Let’s assume that we want to carry out the auto-tuning process of the PID-H controller’s
loop connected to an OC type output in the
PULS
mode. In such an arrangement the device is
to control the temperature of an oven (in a free state of 20
C) using a high power SSR relay,
and the feedback concerning the temperature is obtained using a Pt100 sensor.
Figure. 10.5 Example arrangement of connections for auto-tuning
Preparatory steps to launch the auto-tuning process:
a) Connect the system in accordance to the diagram in 10.5.
b) In the selected OC type output set:
parameter
Sour
as
PidH
,
parameter
modE
as
PULS
,
parameter
Peri
at
6.0
,
c) Set the
tYPE
parameter (in the
inPt
menu) as
Pt 1
,
d) Set the setpoint to 120
C (the
SEtP
parameter in the
CtrL
menu),
e) Set the
modE
parameter (in the
CtrL
menu) as
At-H
,
f) Wait until the device carries out auto-tuning (at which time the display will blink),
g) Once the display stops blinking, the device automatically sets up in the
PiD
operating mode
(the
modE
parameter in the
CtrL
menu) and the calculated settings of the
PID-H
controller’s
loop will be stored in the appropriate parameters,
61
OC-type output
Measurement input
SSR
Pt100
230V
