30 pmg511en21p01
Start
…
If the
MV
control output is 100%, the
PV
exceeds the LBA detection band
[LBaB]
during the LBA
monitoring time
[LBaT]
.
…
MV
control output change status
(LBA supervision time resets)
…
If the
MV
control output is 0% and the
PV
does not fall below the LBA detection band
[LBaB]
during
the LBA monitoring time
[LBaT]
, the loop break alarm
(LBA)
will turn on after the LBA monitoring time
[LBaT]
.
…
The control output
MV
is 0% and the loop break alarm
(LBA)
turns and remains on.
…
MV
control output change status
(LBA supervision time resets)
…
If the
MV
control output is 100% and the
PV
does not rise above the LBA detection band
[LBaB]
during
the LBA monitoring time
[LBaT]
, the loop break alarm
(LBA)
will turn on after the LBA monitoring time
[LBaT]
.
…
If the
MV
control output is 100% and the
PV
exceeds the LBA detection band
[LBaB]
during the LBA
monitoring time
[LBaT]
, the loop break alarm
(LBA)
will turn off after the LBA monitoring time
[LBaT]
.
…
MV
control output change status
(LBA supervision time resets)
.
5.7.10 Sensor Break Alarm
[PAR4 → AL-1 → SBA]
The controller can be set to send an alarm if no sensor is connected or it is disconnected during temperature
control.
The sensor fault can be confirmed via an external alarm output contact, such as an audible signal or the like.
If the alarm operation is set to
[AL-1]
SBA, the sensor fault alarm will be activated.
Note: The alarm output option can be set to standard alarm [AL-A] or alarm latch [AL-B].
5.7.11 Heater Burnout Alarm
[PAR4 → AL-1 → HBA]
If a heater is used to increase the temperature of the controlled section, the PMG-500 temperature controller can
be set to monitor the heater power supply and send an alarm if it detects a heater connection fault.
The device detects the power supply to the heater using a current transformer
(CT)
which converts the current to
the heater to a specified ratio
(CT ratio)
for inspection. If the heating current
[CT-A]
measured by the CT is less
than the setting value of the heating sensor
[AL1L]
, the heater burnout alarm is activated.
Note: Heating element burnout is only detected
when the temperature controller output is on.
Otherwise, the controller will not detect the heater
burnout. The heater burnout alarm function varies
by model and control output type. The heating-and-
cooling model can use the heating burnout alarm
function in OUT1. Current detection does not occur
if the control output time of OUT1 is less than 250
ms. The alarm output option can be set to standard
alarm [AL-A] or alarm lock [AL-B].
Current Transformer
(CT)
Heater