"Loop Break Alarm" Function; Operative Parameters - ero electronic MKS - mA Manuel De Service

"LOOP BREAK ALARM" FUNCTION

The functioning principle of this alarm is based on the
concept that, with a steady load and steady power output,
the process rate of rise [deviation (P52)/time (P53)] is
steady as well.
Thus, analyzing the process rate of rise of the limit
conditions it is possible to estimate the two rates of rise
which define the correct process behaviour.
The limit conditions are between "OLL" and "OLH"
parameters.
The LBA function is automatically activated when the
control algorithm requires the maximum or the minimum
power and, if the process response is slower than the
estimated rate of rise, the instrument generates an alarm
indication in order to show that one or more element of the
control loop is in fault condition.
Deviation: from 0 to 500 units.
Timer: from 1 sec. to 40 min.
Hysteresis: from 1% to 50 % of the output span.
NOTES:
1) The LBA does not operate during the soft start.
2) For this special function the hysteresis is related with
the power output value and not with its rate of rise.
XKS-mA-1-A0.p65 21

OPERATIVE PARAMETERS

Push the FUNC pushbutton, the lower display will show
the parameter code while the upper display will shows the
value or the status (ON or OFF) of the selected
parameter.
By s or t pushbutton it is possible to set the desired
value or the desired status.
Pushing the FUNC pushbutton, the instrument memorizes
the new value (or the new status) and goes to the next
parameter.
Some of the following parameter may be skipped
according to the instrument configuration.
Param. DESCRIPTION
SP Main set point (in eng. units).
SP is operative when logic inputs 1and 2 are
open.
Range: from rL to rH.
Sñrt SMART status.
The On or OFF indication shows the actual
status of the SMART function (enabled or
disabled respectively).
Set On to enable the SMART function.
Set OFF to disable the SMART function.
ñ.rSt Manual reset of the alarms.
This parameter is skipped if none of the alarms
has the manual reset function.
Set On and push FUNC to reset the alarms.
SP2 Auxiliary set point (in eng. units).
Range: From rL to rH.
SP2 is operative when logic input 1 is open, the
logic input 2 is closed and P47 is different from
0.
SP3 Auxiliary set point (in eng. units).
Range: From rL to rH.
SP3 is operative when logic input 1 is closed, the
logic input 2 is open and P47=2.
SP4 Auxiliary set point (in eng. units).
Range: From rL to rH.
SP4 is operative when logic inputs 1and 2 are
closed and P47 = 2.
nnn Software key for parameter protection.
This parameter is skipped if P20 = 0 or 1
On = the instrument is in LOCK
condition
GB
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26/04/01, 16.46