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Switching positions
time rannge
(3). Setting figures increase
(5). Setting shift
Note: DH48S showing time is the range of electrical continuing (set by using the coding switch of
panel)
b. Explanation of the setting characters
The following characters will show up one by one by pressing SET button every time. According
to different functions, some characters in the instruments you choose may not exist.
c. About PID
(1). Why choose PDI instrument
In most occasions when the request of temperature control is stricter, we adopt PID process to
control. Different temperature control target have different best ratio (P), differential time (I), and
integration time (D) parameters. For traditional PID meters, the identification of these parameters
mentioned above is operated by experienced process control experts. Otherwise, it's likely that the
entire system is out of control for the mismatch of the parameters which bring trouble to most users.
To this series of meter,after starting the function, can simulate experts to conduct a search then
make the whole set the best parameters automatically according to control object, then get to the
best controlling effect.
(2). Usage of PID
①
Press SET, come to the second set area, then get into the "PID set conditions"
according to operational processes, set "AT" at "01". Then press "SET" button for 5 seconds, the
meter will exit from set condition. At that time, AT indicator light blinks. At the vicinity of setting
point or after three periods of PID control (setting time varies according to different objects), PID is
over. "AT" go out, P.I.D parameters which have been set before will be kept in the meter
automatically.
②If we need to examine P.I.D parameters after setting, we can do it in the second setting area.
③In the process of PID, keeping the continuity of power is necessary. We should minimize
interference, otherwise, restart PID.
There may be some differences bet
④
warming and starting on control point. Generally, we choose the latter.
On some great
interference occasion, repeatedly setting may be used to exam the rationality of
⑤
parameters. Then we can define, choose and revise.
Notes:
In a state of setting, PV window shows setting character; SV window shows current
①
settings.
If we want to get into the second setting area from normal control state, press SET button for
②
more than 5 seconds.
③
If we wa
nt to get out of the second setting area to normal control state, there are two ways to
choose: First, press SET button for 5 second or more; second, press any functional button of the
meter at least 30 seconds. There are a little bit differences between these two ways: the parameters
you set or corrected with the first method is inefficient in the second setting area.
In the second setting state, when AT=1, press SET button 5 seconds
④
get out of the second state and get into PID state automatically. At that time, AT is on.
In a working state of PID, press SAT button, the system will
⑤
state. If you want to return to PID state, set AT to 1 again, then press SET button 5 seconds.
⑥To protect the parameters from being revised, you can set the value of LOK to 01 or 02, then
get out.
H. Curve Program Controller
1. Parameter set of curve program.
H
1M～99H99M
(4). Setting figures decrease
(6). SET: process set
ween two parameters of PID starting in the process of
M
1S～99M99S
23
S
0.01S～99.99S
or more, the system will
get into setting state form PID
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