Process Technology LUFRAN Instruction page 56

Alarm Conditions (Continued):
Alarms Alarm History
Menu
N2 Purge N2 Purge Fault
Outlet t/c Outlet T/C Open
Elem o/t # Element OT (slc)
(1 thru 4) – Htr 1 thru Htr 4
Elem o/t # Element OT (soft)
(1 thru 4) – Htr 1 thru Htr 4
PRV PRV Fault
SSR tco SSR Heat Sink OT
M-43-01
Revision - Date: 08 – 04/06/15
Menu
The purge gas pressure switch does not detect adequate
purge gas pressure. The unit has been disabled to prevent
heater failure. This may be caused by shutting off the purge
gas supply to the unit.
When the purge gas pressure is at an acceptable pressure,
the unit can be reset.
The outlet process temperature sensor has failed (open).
The process temperature sensor must be replaced. This
may also be caused by a disconnected sensor connection.
The element temperature has risen above the setting of the
safety limit control (slc) module. This may be caused by
lack of water flow to the unit, a failed SSR or a failed t/c
sensor. This slc is redundant to the PLC control system.
When the element temperature falls below the setting of the
slc, the unit can be reset. NOTE: this alarm can not be
reset through the PLC. Rather, this alarm must be reset
by shutting down the unit and then powering up the
unit. Refer to the SHUTDOWN section on page 54 of
this manual for the appropriate procedure.
This safety signal is redundant to the Element OT (slc)
alarm signal. The element temperature has risen above the
internal setting of the DAC
set a few degrees higher than the setting of the slc safety
limit controller. This may be caused by a lack of water flow
to the unit, a failed SSR or a failed t./c.
The operator does not have access to view or adjust this
setting.
details.
When the element temperature falls below this setting the
unit can be reset.
The liquid sensor mounted in the pressure relief valve
(PRV) discharge tube has detected liquid in the discharge
tube. This is caused by high water pressure applied to the
unit. This may be caused by inlet water pressure exceeding
6.9 bar (100 psi).
When the water pressure drops to an acceptable level and
the PRV closes, the unit can be reset.
The temperature of the heat sink for one or all of the solid
state relays (SSR) has risen above the setting of the
thermostat located directly on the heat sink.
This may be caused by a malfunctioning fan, high ambient
air temperature or inadequate air circulation through the
cabinet. The SSR assembly should be replaced.
The cause of this overtemp alarm must be identified and
corrected before the unit can be reset.
Description
control system, which is factory
TM
Contact PROCESS TECHNOLOGY for further
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Lufran Single Outlet Manual