TUNE OR TUNE AT SETPOINT PROGRAM
Enter program (
▲▼
) and from the display
tunE : oFF
press and hold
✱
and press
▲
to
display
tunE : on
or
tunE : At.SP
Exit program mode (
▲▼
).
The
TUNE
program will now start. The display will show
tunE
as the process temperature
climbs to setpoint.
Note:
During tuning, the main setpoint (SP1) LED will flash.
When the
TUNE
or
TUNE AT SETPOINT
program is complete the PID values are entered
automatically. The process temperature will rise to setpoint and control should be stable. If
not, this may be because optimum cycle time is not automatically implemented. To set the
cycle time see
PROPORTIONAL CYCLE-TIME
.
PROPORTIONAL CYCLE-TIME
The choice of cycle-time is influenced by the external switching device or load. eg.
contactor, SSR, valve. A setting that is too long for the process will cause oscillation and a
setting that is too short will cause unnecessary wear to an electro-mechanical switching
device.
Factory set
To use the 20 sec factory set cycle-time no action is needed whether autotune is used or
not.
To Manually Select AUTOTUNE Calculated CYCLE-TIME
When AUTOTUNE is completed, enter program (
▲▼
) and select
CYC.t
in
Level 1
. The
display will read
CYC.t : 20
(the factory setting).
To view the new calculated optimum value, press and hold both
✱
and
▼
buttons until
indexing stops. The calculated value will be displayed eg.
A16
. If acceptable, exit program
(
▲▼
) to implement this setting.
To Pre-select Automatic Acceptance of AUTOTUNE Calculated CYCLE-TIME
Before AUTOTUNE is initiated select
CYC.t
in
Level1
, press and hold both
✱
and
▼
buttons
until indexing stops at
A – –
. Exit program (
▲▼
) to accept calculated value automatically.
To Manually Pre-select Preferred CYCLE-TIME
Before AUTOTUNE is initiated select
CYC.t
in
Level 1
, press and hold both
✱
and
▲
or
▼
buttons until indexing stops at preferred value then exit program (
▲▼
) to accept.
CYCLE-TIME RECOMMENDATIONS
PROGRAMMER
RAMP-SOAK
This feature enables the controller to ramp up or down from current temperature to a
target setpoint at a pre-determined rate. It then controls at the target setpoint for an
adjustable soak period before switching off the SP1 output.
Set
Setpoint ramp rate (
0 to 9995 deg/hour)
From
SPrr
in Level 1, press and hold
✱
and
▲
or
▼
to scroll to required ramp rate.
Set
Soak
(if required) 0 to 1440 minutes
From
SoAk
– – in Level 1, press and hold
✱
and
▲
or
▼
to scroll to required Soak time.
Set
Ramp on
(Off: On: Hold)
From
Sprn
in Level 1, press and hold
✱
, then press
▲
to select
On
Exit program (
▲▼
) to enter settings into memory and commence ramp to target setpoint.
Notes:
In
Ramp on
configuration, if power is removed from the controller, the Ramp will
re-start when power is restored.
The
Ramp hold
option suspends the ramp at its last value.
If no
Soak
period has been set, control at target setpoint continues indefinitely.
SP2 deviation alarms follow the ramp setpoint and can be used to alarm “out of
limits” ramp rate.
WARNING
The Soak timer is triggered when the ramp setpoint reaches the target setpoint. If the
ramp rate is set too fast for the process, the Soak timer will be triggered before the
process temperature reaches the target setpoint.
5
Output Device
Factory Setting
Recommended Minimum
Internal relay: rLY/rLY1/rLY2
20 seconds
20 seconds
10 seconds
Solid state drives: SSd/SSd1/SSd2
0.1 seconds
Target
setpoint
Deg.
Ramp
°
/hour
Time
Soak
Target
setpoint
Deg.
Ramp
°
/hour
Time
Soak
Hereafter in the Manual the symbol (
▲▼
) signifies both buttons are held pressed
for 3 seconds to ENTER or EXIT Program mode.
English
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