PL-565 Accumass BW500 Page 103
PID Control
(constant speed) being fed from a pre-feeder some distance or more than a few
seconds process time from the scale.
A properly set D term will make the initial oscillations around the setpoint smaller, as
in figure 6. A D term set too high induces high oscillations, as in figure 4. Omission of
the D term, or set too low, shows no effect on the system.
10. The above closed loop cycling procedure allows ease in start up, but final
adjustments may be necessary in actual process operation.
Programming
The BW500 is software ready, however the controller function must be specifically
programmed in addition to programming of parameters P001 through P017.
The BW500 offers programming for two separate PID controls, 1 and 2. The
controller being programmed is identified by the suffix to the parameter number. e.g.
P400-01 indicates that PID for control system 1 is accessed.
Note:
All programming should be done in the PID manual mode.
Access
P
PP
P
P
PP
P
4
44
4
4
44
4
0
00
0
0
00
0
0
00
0
0
00
0
-
--
-
-
--
-
0
00
0
0
00
0
1
11
1
1
11
1
P
PP
P
P
PP
P
I
II
I
I
II
I
D
DD
D
D
DD
D
S
SS
S
S
SS
S
y
yy
y
y
yy
y
s
ss
s
s
ss
s
t
tt
t
t
tt
t
e
ee
e
e
ee
e
m
mm
m
m
mm
m
E
EE
E
E
EE
E
S
SS
S
S
SS
S
e
ee
e
e
ee
e
l
ll
l
l
ll
l
e
ee
e
e
ee
e
c
cc
c
c
cc
c
t
tt
t
t
tt
t
:
::
:
:
::
:
0
00
0
0
00
0
-
--
-
-
--
-
O
OO
O
O
OO
O
f
ff
f
f
ff
f
f
ff
f
f
ff
f
,
,,
,
,
,,
,
1
11
1
1
11
1
-
--
-
-
--
-
M
MM
M
M
MM
M
a
aa
a
a
aa
a
n
nn
n
n
nn
n
u
uu
u
u
uu
u
a
aa
a
a
aa
a
l
ll
l
l
ll
l
,
,,
,
,
,,
,
2
22
2
2
22
2
-
--
-
-
--
-
A
AA
A
A
AA
A
u
uu
u
u
uu
u
t
tt
t
t
tt
t
o
oo
o
o
oo
o
0
00
0
0
00
0
Off disables the PID parameter set, P401 to P418. They are not accessible.
Manual: the control output is the manual output P410.
Auto: engages the PID controller function. This can also be done using the
key.
Notes:
• For the mA output:
mA output 2 (P201-02) is normally reserved for controller 1. The signal is output
at terminals 1 and 2 on the mA I/O board.
mA output 3 (P201-03) is normally reserved for controller 2. The signal is output
at terminals 3 and 4 on the mA I/O board.
P
PP
P
P
PP
P
2
22
2
2
22
2
0
00
0
0
00
0
1
11
1
1
11
1
-
--
-
-
--
-
0
00
0
0
00
0
2
22
2
2
22
2
m
mm
m
m
mm
m
A
AA
A
A
AA
A
u
uu
u
u
uu
u
t
tt
t
t
tt
t
p
pp
p
p
pp
p
u
uu
u
u
uu
u
t
tt
t
t
tt
t
F
FF
F
F
FF
F
u
uu
u
u
uu
u
n
nn
n
n
nn
n
c
cc
c
c
cc
c
t
tt
t
t
tt
t
i
ii
i
i
ii
i
o
oo
o
o
oo
o
n
nn
n
n
nn
n
E
EE
E
E
EE
E
S
SS
S
S
SS
S
e
ee
e
e
ee
e
l
ll
l
l
ll
l
e
ee
e
e
ee
e
c
cc
c
c
cc
c
t
tt
t
t
tt
t
:
::
:
:
::
:
1
11
1
1
11
1
-
--
-
-
--
-
R
RR
R
R
RR
R
a
aa
a
a
aa
a
t
tt
t
t
tt
t
e
ee
e
e
ee
e
.
..
.
.
..
.
2
22
2
2
22
2
-
--
-
-
--
-
L
LL
L
L
LL
L
o
oo
o
o
oo
o
a
aa
a
a
aa
a
d
dd
d
d
dd
d
,
,,
,
,
,,
,
3
33
3
3
33
3
-
--
-
-
--
-
S
SS
S
S
SS
S
p
pp
p
p
pp
p
e
ee
e
e
ee
e
e
ee
e
e
ee
e
d
dd
d
d
dd
d
,
,,
,
,
,,
,
4
44
4
4
44
4
-
--
-
-
--
-
P
PP
P
P
PP
P
I
II
I
I
II
I
D
DD
D
D
DD
D
1
11
1
1
11
1
Note:
• For the mA input:
mA input 1 is an external signal normally reserved for controller 1. The signal is
input at terminals 5 and 6 on the mA I/O board.
mA input 2 is an external signal normally reserved for controller 2. The signal is
input at terminals 7 and 8 on the mA I/O board.
Select manual to program PID
parameters.
Select the PID function.
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