Watlow Series SD31 PID with Optional Countdown Timer - Manual (Page 21)

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 4 H o m e
Display Parameter Name
Description
Settings Range
(Integer values for Modbus
in parenthesis.)
Default Modbus*
(less 40,001
offset)
Read/Write
Appears if:
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.
Note: The [~dsp] setting on the Setup Page, determines if Process or Set Point is normally displayed and the action of the ß Key.
4
Home Page
Measured
Value Process Value
Displays the current process value.
-1999 to 9999
degrees or units
(-1999000 to 9999000) NA *20, 21 R There is no input error
and
[Ftr;E] is set to
[`Off] or [Cont].
Set Value Closed Loop Set Point
Show the current closed loop control set
point.
Set Point Low Limit
[SP;Lo] to Set Point High
Limit
[SP;hi]
[`Off] Stop controlling to
SP (-200000001)
75 *27, 28
R/W Control mode is
[auto] and there is no
input error.
Measured
Value Filtered Process Value
Displays the current filtered process
value.
-1999 to 9999
degrees or units
(-1999000 to 9999000) NA *22, 23 R There is no input error
and
[Ftr;E] is set to
[Disp] or [both].
Set Value Open Loop Output Power
Show the current open loop (manual)
control set point.
The % indicator light is on when the con-
troller is in open loop (manual control).
-100.0 to 0.0% if any output
is set to cool; 0.0 to 100.0%
if any output is set to heat
(-10000 to 0000, 0000 to
10000. Two decimal places
implied for Modbus.) 0.0% 26 R/W Control mode is
[Man]. If there is no
input error and
[Ftr;E]
is set to [`Off] or
[Cont].
[``rP] Current Ramp Set Point
The current working control set point for
the ramp that is in process appears in
the display after this prompt appears.
-1999 to 9999
(-1999000 to 9999000) NA *254 255 R Controller is ramping.
[Proc] Process Value
Displays the current process value.
-1999 to 9999
degrees or units
(-1999000 to 9999000) NA *20, 21 R If there is no input er-
ror, ramping set point
is active and
[~dsp] is
set to [~Pro].
[hour] Countdown Time - Hours
Displays the number of hours remaining
for the countdown time.
0 to 99
hours
(0 to 99000) 0 375 R Timer model only,
SD31-XXXX-XTXX.
[`Ot1] or [`Ot2]is set
to
[tim].
[Min] Countdown Time - Minutes
Set the number of minutes remaining for
the countdown time.
0 to 59
minutes
(0 to 59000) 0 376 R Timer model only,
SD31-XXXX-XTXX.
[`Ot1] or [`Ot2]is set
to
[tim].
[`Sec] Countdown Time - Seconds
Set the number of seconds remaining for
the countdown time.
0 to 59
seconds
(0 to 59000) 0 377 R Timer model only,
SD31-XXXX-XTXX.
[`Ot1] or [`Ot2]is set
to
[tim].
Press the Infinity Key ˆ at any time to go to the Home Page.
Depending upon the controller’s status, you will see some combination of the parameters listed below. Normally,
you will see the Process Value in the display. See Home Page Overview in Chapter Three.
After 60 seconds with no key presses, the controller reverts to the Home Page.