ero electronic MKC, User Manual, Page: 116 / 141

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Digital output types :
Relay, SSR or TRIAC.
Digital output action type :
Proportional time
Analog output types : 20 mA.
Servomotor output :
Two relays with interlocked contact
Servomotor output type:
- Close loop
- Open loop with feedback for valve position indication only
- Open loop without feedback.
Proportional Band : programmable from 0.5% to 999.0% of the
input span.
Setting a PB equal to 0 the control action becomes ON/OFF.
Hysteresis (for ON/OFF control action) : programmable from
0.1% to 10.0 % of the input span.
Integral time : programmable from 1 second to 20 minutes or
excluded.
Derivative time : programmable from 1 second to 10 minutes or
excluded.
Integral pre-load : programmable
- for one control output, from 0 to 100% of the output range.
- for two control outputs (split range excluded), from -100 % to
+100 % of the output range.
SET POINTS
This instrument allows to use up to 4 set points: SP, SP2, SP3 and
SP4.
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 rates of change
(ramp up and ramp down).
Slope value : 1 - 200 eng. unit/min or step.
Set points limiter : rL [r.E12] and rH [r.E13] parameters, program-
mable.
CONTROL ACTIONS
Algorithm
: PID + SMART
Types:
- one control output (digital or analog output)
- one control output splitted on two outputs.
- two control outputs
NOTE : the outputs can be freely selected among analog, digital
or servo outputs.
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