Lba Alarm (Loop Break Alarm) - gefran GFW ADV Configuration Manual

LBA ALARM (Loop Break Alarm)

This alarm identifies incorrect functioning of the control loop due to a possible load break or to a short circuited or
reversed probe.
With the alarm enabled (parameter AL.n), the instrument checks that in condition of maximum power delivered for
a settable time (Lb.t) greater than zero, the value of the process variable increases in heating or decreases in cooling: if this
does not happen, the LBA alarm trips. In these conditions, power is limited to value (Lb.P).
The alarm condition resets if the temperature increases in heating or decreases in cooling.
Enable alarm
195*
AL. n
44
Lb. t
119
Lb. p
81
Reset LBA alarm
bit
Read state
8
STATE of LBA
ALARM
bit
FUNCTIONAL DIAGRAM
Break in control
loop
34
R/W Select number of enabled alarms
Delay time for tripping of LBA alarm
R/W
Limitation of power delivered in
R / W
presence of LBA alarm
R/W
OFF = LBA alarm off
R
ON = LBA alarm on
see: Table of enabled alarms
0,0 ... 500,0 min
-100,0 ..100,0 %
Enable alarm
(AL.n)
Delay time for tripping
(Lb.t)
3
zone1
If Lb.t = 0, the LBA alarm is disabled
State of LBA variable
Limitation of power Lb.P
80963B_MSW_GFW_11-2012_ENG
0 0
zone2 zone3
30,0
25,0
See outputs
See Alarms
SBR-Err