IRIS MODEL P522 APPLICATION MANUAL
modules in a system. Care should be taken when wir- ing multiple P522s to ensure the selected bus wires will carry the current. The
has been corrected, and can be performed from the front panel (by pressing the RESET button), or re- motely through the serial communication.
APPROVALS
The P522 and viewing heads have Factory Mutual (FM) Approval for Combustion Safety; Canadian Standards Association (CSA) Certification, and National Recog- nized Testing Laboratories (NRTL) Listing.
SELF-CHECKING FUNCTION
When energized, the self checking function indicates that both the P522 and the viewing head are func- tioning properly. The software in the P522 activates the
Note that, with regard to the viewing head, the self checking function still works the same way as with the M502, A513 and D504 signal processors. For instance, a runaway UV tube will cause a “lockout condition” (more than 10 pulses counted during the dark period). (Refer to section EXPLANATION
OF 1-9, > 10 PULSES COUNTED DURING THE
DARK PERIOD, in the Model 500 Signal Proces- sor Application Manual.)
A runaway UV tube or any component failure, in- cluding the shutter, will cause a lockout condition that will
POWERING UP THE P522
Once the power is connected (26 VDC) to the
The P522 has been designed to deal with any fore- seeable power failure or anomaly.
For example: if the power goes off while you are in the process of storing a set point (either from the front panel or from the remote, host computer), the internal power monitor circuit will signal the P522 processor to complete the store function before shutting down in an or- derly manner. This prevents bogus num- bers from being stored and protects ex- isting data in the EEPROM (Electrically Erasable Programmable Read Only Memory) from corruption, and is facili- tated by a special internal power supply that holds a charge (like a battery) just long enough to allow the processor to do its job before going dead.
This internal circuit monitors the 26 VDC power feeding the P522, and when the voltage drops to about 19 volts, the processor shuts down, the pro- gram stops running, and the
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