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Installation, Operation, and Maintenance Manual # 509252 Rev R 67
System Faults
The bottom three LEDs indicate system faults. These faults always shut down ALL
units in the system, causing all LAMP CONTROL switches to flash.
System interlock switches and the RF detector may be connected to any unit, but are
normally connected to the master. System faults will then be detected and displayed at
the master power supply.
Fault Diagnosis Tables
To determine the likely cause of failure in an F300S/F300SQ unit, note the operating
sequence when the failure occurs. Also, record which fault indicator LED lights. The
indicator may light immediately when the unit is switched from one condition to
another (for example, from STANDBY to ON); or the signal may be displayed until
after a programmed internal delay has elapsed.
There is a troubleshooting table for each fault indicator, showing secondary symptoms
to help localize the problem. The possible causes are listed, followed by testing and
repair instructions.
PWR ERROR Improper operation of magnetron: either no magnetron anode
current 2-4 seconds after high voltage is applied, or the
presence of high voltage when the Lamp system is in OFF or
STANDBY.
CAUTION: If a PWR ERROR fault is indicated, press the LAMP
OFF/RESET switch immediately. To prevent magnetron
damage, single-phase power should be disconnected (see PWR
ERROR fault).
PS TEMP The power supply is overheating.
BLWR PRESSURE Cooling air pressure within the irradiator is insufficient.
Table 16. System Faults
Indicator Description
SYS BLWR Insufficient cooling air pressure in an external supply or exhaust
blower causes pressure switch to open.
EXT INTLK Open external interlock switch on a plenum cover, for example,
connected at customer option.
RF INTLK Excessive RF at the RF detector, or loss of power to detector.
Table 15. Unit Faults (continued)
Indicator Description