Watlow Series SD31 PID with Optional Countdown Timer - Manual (Page 32)

Wa t l o w S e r i e s S D 3 1
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30
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C h a p t e r 6 O p e r a t i o n s
Display Parameter Name
Description
Settings Range
(Integer values for Modbus
in parentheses.)
Default Modbus*
(less 40,001
offset)
Read/Write
Appears if:
Note: Parameters appear on the Operations Page only if activated from the Programming Page. See page 16 for Operations Page defaults.
Note: Some values will be rounded off to fit in the four-character display. Full values can be read with Modbus.
* Low register numbers contain the two higher bytes; high register numbers contain the two lower bytes of the four-byte integer.
Decimal precision is implied at three decimal places unless otherwise noted.
Caution: Writing to registers continuously, such as ramping set points via comms, will damage the SD31 EEPROM memory. See page 59.
[rA;ht]
[rA.ht] Rate Heat
Set the PID rate time in minutes for the
heat output.
0.00 to 9.99 minutes
(0000 to 9990)
0.00: disabled
0.00 *228, 229
R/W At least one output is
set to
[hEAt], [ht;m]
is set to [`PId], and
[Unit] is set to [``US].
[dE;ht]
[dE.ht]
Derivative Heat
Set the PID derivative time in minutes
for the heat outputs.
0.00 to 9.99 minutes
(0000 to 9990)
0.00: disabled
0.00 *228, 229
R/W At least one output is
set to
[hEAt], [ht;m]
is set to [`PId], and
[Unit] is set to [``SI].
[dB;ht]
[dB.ht] Dead Band Heat
An offset of the heating proportional
band from the set point.
0 to 999
(0000 to 999000) 0 *279, 280
R/W At least one output is
set to
[hEAt] and
[ht;m] is set to PID.
[h;hyS]
[h.hyS]
Heat Hysteresis
Set the control switching hysteresis for
on-off control. This determines how far
into the “on” region the input needs to
move before the output actually turns on.
1 to 999 degrees, if [`Sen]
is set to [``tc] or [`rtd]
(1000 to 999000)
0.000 to 999.999 units, if
[`Sen] is set to [`ma] or
[uolt]
(0000 to 999999)
1.0
1.000
*232, 233
R/W
*234, 235
R/W
At least one output is
set to
[hEAt], and
[ht;m] is set to
[on;oF].
[CL;m]
[CL.M] Cool Control Method
Set the Cool Control Method
[`OFF] off (0)
[`PId] PID (1)
[on;oF] on-off (2) [`OFF] (0) 214 R/W At least one output is
set to
[CooL].
[Pb;CL]
[Pb.CL]
Proportional Band Cool
Set the proportional band for the cool
outputs.
1 to 999°F if [`Sen] is set
to [``tc] or [`rtd]
(1000 to 999000)
0.000 to 999.0 if [`Sen] is
set to [`ma] or [uolt]
(0000 to 999000)
25
25.000
*218, 219
R/W
*222, 223
R/W
At least one output is
set to
[Cool], and
[CL;m] is set to
[`PId].
[re;Cl]
[rE.CL] Reset Cool
Set the PID reset in repeats per minute
for the cool output.
0.00 to 99.99 repeats per
minute
(0000 to 99990)
0.00: disabled
0.00 *226, 227
R/W
(Modbus
value is in-
tegral,
which is
the inverse
of reset.) At least one output is
set to
[CooL], [Cl;m]
is set to [`PId], and
[Unit] is set to [``US].
[It;CL]
[It.CL]
Integral Cool
Set the PID integral in minutes per re-
peat for the cool outputs.
0.00 to 99.99 minutes per
repeat
(0000 to 99990)
0.00: disabled
0.00 *226, 227
R/W At least one output is
set to
[CooL], [CL;m]
is set to [`PId], and
[Unit] is set to [``SI].