32
GB
CONTROL ACTIONS
Control action: PID + SMART
Type: One (heating or cooling) or two (heating and
cooling) control outputs.
Proportional Band (Pb): from 1.0 to 200.0 % of
the input span.
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 1 s 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 -100.0 (cooling) to +100.0 % (heating) for
two control output.
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
This instrument is equipped with four relay
outputs.
OUT 1 can be used either as servomotor output
(together OUT 2, both relays are interlocked) or as
independent relay output (in this case, OUT 2
cannot be used); OUT 3 and OUT 4 are
independent relay outputs.
The outputs can be programmed as follows:
Out 1 + Out 2 Out 3 OUT 4
interlocked relay relay
servomotor AL1 AL2+ AL3
Heating AL1 AL2+ AL3
Cooling AL1 AL2+ AL3
Heating Cooling AL2+ AL3
NOTE: alarm 2 and 3 are in OR condition on the
OUT 4 relay.
Control output updating time :
- 250 ms when a linear input is selected
- 500 ms when a TC input is selected.
Control output resolution: 0.1% of the span.
Direct/reverse action: programmable.
Output level indication (for control outputs):
The instrument displays separately the output 1
value and the output 2 value.
Output level limiter(for control outputs):
- For one control medium: from 0.0 to 100.0 % .
- For two control mediums: from -100.0 to +100.0%
This function may be operative at instrument start up
for a programmable time (To avoid thermal shock
and/or preheating the plant).
LFS-servo-1-02.p65 1/14/02, 3:44 PM32
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