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Power Automation and Protection Division
c. Power Up RAM Check
Immediately upon power-up, the relay does a complete ROM (EPROM) checksum of program
memory. Afterwards, the REL 352 relay continually computes the program memory checksum.
d.
Nonvolatile RAM Check
All front-panel-entered constants (settings) are stored in nonvolatile RAM in three identical
arrays. These arrays are continuously checked by the program. If all three array entrees dis-
agree, a nonvolatile RAM failure is detected.
3.
UNIQUE REMOTE COMMUNICATION (WRELCOM) PROGRAM
Two optional types of remote interface can be ordered.
• RS232C for single point computer communication.
• INCOM for local network communication.
A special PC software (WRELCOM RCP and OSCAR) program are available for obtaining or
sending the setting
events (last and previous faults), but with the remote communication, 16 fault events and 3
records of oscillographic data can be obtained and stored. Each record of the oscillographic
data contains 8-cycle information (1-prefault and 7-post-fault), with 7 analog inputs and 24 dig-
ital data (at the sampling rate of 12 per cycle).
REL 352 Version 1.00
information to the REL 352. The REL 352 front panel shows two fault
I.L. 40-201.9
1
1-5
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