Process Technology LUFRAN Instruction page 101

Troubleshooting (Continued):
Alarm Description
L. Level
Liquid Level Alarm Column
(1 thru 4)
N2 Purge Alarm
N2 Purge
Outlet Thermocouple Alarm
Outlet t/c
Element Thermocouple
Elem o/t #
(1 thru 4)
Pressure Relief Valve Alarm
PRV
SSR TCO Alarm
SSR tco
M-43-01
Revision - Date: 08 – 04/06/15
The liquid level sensor at the top of heating column does not detect liquid in
the outlet tube of that column. The system is disabled until the liquid level
sensor detects liquid in the outlet tube of the heating column. This may be
caused by a lack of water to the unit.
This safety will prevent catastrophic overheat damage to the heating
column. The cause of the liquid level fault must be identified and corrected
before the unit can be reset. The sensor can be recalibrated. Please
reference the Lufran manual for the proper procedure to calibrate the liquid
level sensor. This will be located in the Maintenance section of the manual.
The purge gas flow switch does not detect adequate purge gas flow. 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. Verify that the sensor is operating
properly by using an ohm meter to verify that the Thermocouple is in good
working condition. If the The thermocouple is working properly it is possible
that the PLC input card may be damaged and need replaced. Consult the
factory for the appropriate replacement component.
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 Future Design 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
Alarm must be reset by cycling the main circuit breaker off and then on powering
up the unit. Refer to the SHUTDOWN section of this manual for the
procedure.
If the element thermocouple is found to be damaged or open then the
heater column will need to be replaced. Consult the factory for the
appropriate replacement.
The liquid sensor mounted above the pressure relief valve (PRV) discharge
tube has detected liquid in the 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 directly located 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.
Action Required
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Lufran Single Outlet Manual