SET POINTS
This instrument allows to use 2 set points: SP and SP2.
The set point selection is possible only by logic input.
Set point transfer:
The transfer between one set point to another (or between two different set point values) may be realized by a step transfer or by a ramp with two different programmable rate of change (ramp up and ramp down).
Slope value: 1 - 100 eng. unit/min or step.
Set points limiter: RLO and RHI parameters, pro- grammable.
CONTROL ACTIONS
Control action: PID + SMART
Type: One (heating or cooling) or two (heating and cooling) control outputs.
Proportional Band (Pb):
Range: - from 1.0 to 100.0 % of the input span for process with one control output.
-from 1.5 to 100.0 % of the input span for process with two control outputs.
When Pb=0, the control action becomes ON/OFF. Hysteresis (for ON/OFF control action):
from 0.1% to 10.0% of the input span.
Integral time (Ti): from 1s to 20 min. or excluded.
Derivative time (Td): from 1 s to 10 min.
If zero value is selected, the derivative action is excluded.
Integral pre-load:
-from 0.0 to 100.0 % for one control output
-from
SMART: keyboard enabling/disabling
Auto/Manual: selectable by front pushbutton.
Auto/Manual transfer: bumpless method type
Indicator "MAN" : OFF in auto mode and lit in manual mode.
OUTPUTS
Type: This instrument is equipped with 3 independent outputs programmable as follows:
Out 1 | Out 2 | Out 3 |
linear (mA) | relay | relay |
Heating | AL1 | AL2 |
Heating | Cooling | AL2 |
Heating | AL1 | Cooling |
Cooling | AL1 | AL2 |
Cooling | Heating | AL2 |
Cooling | AL1 | Heating |
Retransm. | Heating | AL2 |
Retransm. | AL1 | Heating |
Retransm. | Cooling | AL2 |
Retransm. | AL1 | Cooling |
Retransm. | Heating | Cooling |
Retransm. | Cooling | Heating |
Retransm. | AL1 | AL2 |
Control output updating time :
-250 ms when a linear input is selected
-500 ms when a TC or RTD input is selected. Action: direct/reverse programmable by front
keyboard.
Output level indication:
The instrument displays separately the output 1 level (heating) and the output 2 level (cooling). Output status indication: the OUT 1 LED will flash with a duty cycle proportional to the output 1 power. Two indicators (OUT 2 and/or OUT 3) are lit when the respective output is in ON condition.
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