Control mode
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) within the “LBA detection time” (
C.Lbt
, PL-2) or the direction of change does not corre-
spond to the set control function (heating or cooling).
For example, when heating, the controlled temperature should increase after output acti-
vating and decrease after deactivating. If it is not the case, the loop break alarm will turn
on.
7.1.3
Alarm handling
In the case of alarm (error) in a channel
the corresponding indicator of the group “CHAN-
NELS” starts blinking, Z1 display shows the number of this input (e.g.
) and the Z2
display shows the cause of error (see Table 7.1).
The alarm (error) persists until the cause is removed or the channel is disabled by the
user. During the alarm (error) the logic unit connected to the erroneous input switches the
connected output to the state (ON/OFF) defined in the parameter
“Error output state”
(
Er.St
PL-2).
7.1.4
Alarm output
If an alarm signal is needed, select an output, preferably not used in other channels, and
set it as an “Alarm output” in the parameter
AL.dr
(PL-0).
If an alarm or an error occurs, the alarm output is set to the
“Alarm output state”
(ON/OFF) defined in the parameter
AL.St
(PL-0) for the time defined in the
“Alarm dura-
tion
” (parameter
ALHd
, PL-0, 1
…600 s). The output can be reset before this time by
pressing the key
. After the alarm duration time the output is reset in the previous
state, but if the cause remains the alarm output will be triggered every 60 seconds for 1
second. The faulty channel can be disabled by setting the parameter
C.in
(PL-2) to OFF.
Table 7.1
Error
Z2 display
Short circuit (RTD)
Sensor break (RTD / TC)
Measured value below the lower limit
(except 0-5 mA, 0-20 mA, 0-1 V inputs)
Measured value above the upper limit
Reference junction temperature too high
Measuring unit error
Sensor disabled (
in-t
= OFF)
LBA
7.1.5
Warning indication
In addition to the alarm, it is also possible to display a channel status change immediate-
ly, regardless of the cyclical channel displaying. When the function is active, the flashing
channel LED of the "CHANNELS" group indicates that the control channel has activated
its output. No alarm signal is generated. The flashing LED is switched off as soon as the
output is deactivated. To activate the function, set the parameter
AL.oU
(group PL-2) for
the corresponding control channel to ON.