71
Remedies
Decrease the set value of the parameter
.
Remove the short-circuited terminals.
Connect it properly.
Power it on.
Prepare the Micro-controller to be suitable for the
device to be controlled. Or select the device to be
controlled to be suitable for the Micro-controller.
Set the parameter
to "0" or "3".
Set the parameter
to "0", "2", "3" or
"5".
Widen the range
to . (How-
ever, it should be within the set range in the
input range table.)
Set the parameter of
to
.
Change the set value of the concerned dSP.
Make the difference of the set values of
and
larger, and perform the auto-tun-
ing again.
Set the desirable SV, and perform the auto-
tuning again.
Use a controller whose control cycle is fast,
such as PYH.
Set the parameter
to
, and per-
form the auto-tuning again.
Connect them properly.
Set the parameter of
properly.
Perform the tuning manually. (Set the para-
meter
to "0" to try the ON/OFF control.)
(1) Perform the auto-tuning with the para-
meter
being "2" (Low PV type AT).
(2) Perform the tuning manually.
Symptoms
8. Response is too slow. (The mea-
sured value changes slowly.)
9. Output changes be-
tween ON and OFF, but
the indicated value does
not change.
10. The keys do not operate.
The set value of the para-
meters cannot be changed.
11. The SV cannot be
changed.
12. The parameters you want
to confirm or change are
not displayed.
13. Auto-tuning does not
work properly.
14. An excessive over-
shoot has occurred dur-
ing auto-tuning opera-
tion.
15. The self-tuning does
not work properly.
Possible causes
Input filter constant is too large.
q Some input terminals are short-circuited.
w The connecting cable for the device to be
controlled are not connected properly.
e
The device to be controlled has powered off.
r The output signals of the Micro-control-
ler do not match the input signals of the
device to be controlled.
"1", "2", "4", or "5" is set in the parameter
.
q "1", or "4" is set in the parameter .
w You have tried to set the value that is out-
side of the measuring temperature range
(Parameters of
to
).
e
You have tried to change the SV during ramp-soak
operation (
,
, or
is selected.)
The concerned parameters are set to skip in
the parameters of
to
.
q After starting the auto-tuning operation,
the display has showed
or
.
w You have changed the SV after starting
the auto-tuning operation.
e The response of the controlled device was
too fast.
r You have tried to perform the auto-tuning
during ramp-soak operation.
t Peripheral devices have problems. Or they
are not connected properly.
y
Direct/reverse actions are not suitable for the
operations of the system to be controlled.
u The response of the controlled system was
too slow, and the auto-tuning did not fin-
ish in 9 hours.
-
-
See the section of the parameter
.
Reference
pages
Page 39
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Page 19
Page 19
Page 50
Page 14
Page 69
Page 36
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Page 14
Page 49
Page 20
Page 16
Page 20
Page 27
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