Watlow Series SD31 PID with Optional Countdown Timer - Manual (Page 31)

Wa t l o w S e r i e s S D 3 1
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C h a p t e r 6 O p e r a t i o n s
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.
Display Parameter Name
Description
Settings Range
(Integer values for Modbus
in parentheses.)
Default Modbus*
(less 40,001
offset)
Read/Write
Appears if:
Operations Parameters Table
6
These parameters can be selected to appear on the Operations Page. Select parameters to appear on the Operations
Page on the Programming Page.
To go to the Operations Page, press and hold the Infinity Key ˆ for three seconds from the Home Page.
[Oper] will appear in the display.
• Press the Down ¯ or Up ¿ keys to move through the Operations Page parameters.
• To view or change a parameter value, press and hold the ß Key.
• Press the Down ¯ or Up ¿ keys to change the parameter value.
• Press the Infinity Key ˆ at any time to return to the Home Page.
[Po;ht]
[Po.ht] Power Heat
Displays the current heat control power.
0.0 to 100.0% power
(000 to 10000)
(Two decimal places implied
for Modbus.) NA 256 R [A-M] is set to [auto]
and at least one output
is set to
[hEAt].
[Po;CL]
[Po.CL] Power Cool
Displays the current cool control power.
0.0 to 100.0% power
(000 to 10000)
(Two decimal places implied
for Modbus.) NA 257 R [A-M] is set to [auto]
and at least one output
is set to
[Cool].
[A-m]
[A-M] Auto-Manual Mode
Set the control mode.
[auto] auto mode (0)
[Man] manual mode (1) [auto] (0) 25 R/W Always appears.
[`Aut]
[ Aut] Autotune
Start an autotune.
[`OFF] off (0)
[``On] on (1) [`OFF] (0) 215 R/W At least one output is
set to
[hEAt] or
[Cool].
[`Cal]
[ CAL]
Calibration Offset
Offset the input reading.
-999 to 999
(-999000 to 999000) 0.0 *85, 86
R/W Always appears.
[ht;m]
[ht.M]
Heat Control Method
Set the heat control method.
[`OFF] off (0)
[`PID] PID (1)
[on;of] on-off (2) [`PID] (1) 213 R/W At least one output is
set to
[hEAt].
[Pb;ht]
[Pb.ht]
Proportional Band Heat
Set the proportional band for the heat
outputs.
1 to 999°F, if [`Sen] is set to
[``tc] or [`rtd]
(1000 to 999000)
0.000 to 999 units, if [`Sen]
is set to [`mA] or [uolt].
(0000 to 999000)
25
25
*216, 217
R/W
*220, 221
R/W
At least one output is
set to
[hEAt] and
[ht;m] is set to
[`PId].
[rE;ht]
[rE.ht] Reset Heat
Set the PID reset in repeats per minute
for the heat outputs.
0.00 to 99.99 repeats per
minute
(0000 to 99990)
0.00: disabled
0.00 *224, 225
R/W
(Modbus
value is in-
tegral,
which is
the inverse
of reset.) At least one output is
set to
[hEAt], [ht;m]
is set to [`PId], and
[Unit] is set to [``US].
[It;ht]
[It.ht]
Integral Heat
Set the PID integral in minutes per re-
peat for the heat outputs.
0.00 to 99.99 minutes/per
repeat
(0000 to 99990)
0.00: disabled
0.00 *224, 225
R/W At least one output is
set to
[hEAt], [ht;m]
is set to [`PId], and
[Unit] is set to [``SI].