Service manual

www.enc.net.cn/en Tel/Fax:[phone] Detailed function description
74
EDS1000 built-in PID adjustor make up of control system and its work
principle chart is as follows:
Fig.6-14 PID control principle diagram
In above diagram Kp: proportion gain；Ki: integral gain；Kd: differential gain
In above Fig.6-14 ,definition of closed-loop specified value, feedback value,
error limit and proportion integral differential parameter is same as that of
common PID adjustor parameter, see respectively (F3.01~F3.12) definition，
relation of specified value and expected feedback value is as shown in Fig.6-15.
Thereinto specified value take 10V as reference and feedback take 20mA as
reference.
Specified value adjusting and feedback value adjusting in Fig.6-14 is for
confirming corresponding relation and unitive dimension between specified value
and feedback value.
Fig.6-15 specified value and expected feedback value
When the system is determined，basic steps for setting closed-loop parameter
are as follows:
(1) determine closed-loop provision and feedback channel(F3.01, F3.02)
(2) need to set relation between closed-loop provision and feedback for analog
closed-loop (F3.04~F3.07)
specified value
Expected feedbck value
20mA
4mA
10V
0
Closed-loop
specified value
feedback adjusting
(F3.05，F3.07)
error limit
(F3.12)
closed-loop
feedback value
e
+
_
integral
gain
(
F3.09
)
proportion
gain
(F3.08)
closed-loop
output
+
+
different
i
-
al gain
(
F3.10
)
specified value
adjusting
(
F3.0
4
，
F3.06
)
Specified value can also be provided with option by F0.00 function code.
note