Proportional Cycle-Time; Cycle-Time Recommendations - CAL Controls CAL 3300 User Manual

Hereafter in the Manual the symbol (
for 3 seconds to ENTER or EXIT Program mode.
TUNE OR TUNE AT SETPOINT PROGRAM
Enter program ( ) and from the display tunE : oFF press and hold
display tunE : on or tunE : At.SP Exit program mode (
TUNE program will now start. The display will show tunE as the process temperature
The
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 (
display will read CYC.t : 20 (the factory setting).
To view the new calculated optimum value, press and hold both
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
until indexing stops at A – – . Exit program (
To Manually Pre-select Preferred CYCLE-TIME
Before AUTOTUNE is initiated select CYC.t in Level 1, press and hold both
buttons until indexing stops at preferred value then exit program (

CYCLE-TIME RECOMMENDATIONS

Output Device
Internal relay: rLY/rLY1/rLY2
Solid state drives: SSd/SSd1/SSd2
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) signifies both buttons are held pressed
and press to
).
) and select CYC.t in Level 1. The
and buttons until
and buttons
) to accept calculated value automatically.
and or
) to accept.
Recommended Minimum
Factory Setting
20 seconds 10 seconds
20 seconds 0.1 seconds
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.
Deg.
Soak
Target
setpoint
Ramp °/hour
Time
Set Setpoint ramp rate (0 to 9995 deg/hour)
From SPrr in Level 1, press and hold
and
Set Soak (if required) 0 to 1440 minutes
From SoAk – – in Level 1, press and hold
Set Ramp on (Off: On: Hold)
From Sprn in Level 1, press and hold , then press
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.
Deg.
Ramp °/hour
Target
setpoint
Soak
Time
or to scroll to required ramp rate.
and or to scroll to required Soak time.
to select On
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