Mitsubishi FR-E520-0.1K-NA - Page 154

PARAMETERS
139
(
5
)
Parameter setting
Parameter
Number
Setting Name Description
0 No PID action
20 For heating, pressure control, etc. PID reverse action128
21
PID
action
selection
For cooling, etc. PID forward action
0.1 to
1000%
If the proportional band is narrow
(
parameter settin
g
is small
)
, the manipulated variable varies
g
reatl
y
with a sli
g
ht chan
g
e of the process value. Hence, as
the proportional band narrows, the response
sensitivit
y
(g
ain
)
improves but the stabilit
y
deteriorates, e.g. hunting occurs.
Gain Kp = 1/proportional band
129
9999
PID
propor-
tional
band
No proportional control
0.1 to
3600 s
Time required for the inte
g
ral
(
I
)
action to provide
the same manipulated variable as that for the
proportional
(
P
)
action. As the inte
g
ral time
decreases, the set point is reached earlier but
hunting occurs more easily.
130
9999
PID
integral
time
No integral control.
0 to 100%
Set the upper limit. If the feedback value exceeds
the settin
g
, the FUP si
g
nal is output.
(
Process value
of 4mA is equivalent to 0% and 20mA to 100%.)
131
9999
Upper
limit
No function
0 to 100%
Set the lower limit.
(
If the process value
g
oes out of
the settin
g
ran
g
e, an alarm can be output. In this
case, the process value of 4mA is equivalent to 0%
and 20mA to 100%.)
132
9999
Lower
limit
No function
133 0 to 100%
PID
action set
point for
PU
operation
Onl
y
valid for the PU command in the PU operation
or PU/external combined operation mode.
For external operation, the volta
g
e across 2-5 is the
set point.
(
Pr. 902 value is equivalent to 0% and Pr. 903 value
to 100%.)
0.01 to
10.00 s
Time required for the differential
(
D
)
action to provide
the same process value as that for the proportional
(
P
)
action. As the differential time increases,
g
reater
response is made to a deviation change.
134
9999
PID
differential
time
No differential control.
(
6
)
Adjustment procedure
Adjust the PID control parameters, Pr. 128 to Pr. 134.Parameter setting
Set the output terminal functions, Pr. 190 to Pr. 192.
Terminal setting
Run