SECTION 28. MAINTENANCE
28.1 INTRODUCTION
This section provides maintenance instructions for the RFL 9300 Charge Comparison System. Topics dis-
cussed include alarm codes, removal and replacement procedures, fuse replacement, corrective maintenance
information, and instructions for converting a 3-Terminal 9300 to a 2-Terminal 9300. Information is also provided
on how to arrange for servicing by RFL personnel.
28.2 ALARM CODES
The RFL 9300 senses and detects many different conditions that will cause an alarm. If any of these conditions
exists, the word "ALARM" appears on the top line of the display and one or more code numbers appears on the
bottom line of the display. At the same time, a beeper will sound intermittently if the beeper has been enabled.
Alarm codes beginning with a "1" mean that a failure has been detected in the RFL 93B DISPLAY module.
These alarms may only be reset by pressing the RESET switch on the front of the display module.
10 Local Display Controller Alarm: Nine seconds has elapsed without RFL 93B SV module com-
munications taking place.
12 Local Display Controller Alarm: No acknowledgment has been received from the Supervisor
Module for 200 ms.
13 Local Display Controller Alarm: Three non-acknowledgments (NAKs) from Supervisor Module.
14 Oscillography Controller Alarm: Display Controller has lost communication with Oscillography
Board.
15 Local Display Controller Alarm: Non-volatile RAM failure on Display Controller.
16 Transmit Address 1: Verification of Local and Remote Address has failed.
17 Transmit Address 2: Verification of Local and Remote Address has failed. (This alarm code is
not present in two terminal systems)
Alarm Codes beginning with a "2" mean that a failure has been detected in the trip relays' current sensors.
These alarms may only be reset by pressing the RESET switch on the front of the display module.
20 Reserved for future use
21 Reserved for future use
22 Reserved for future use
23 Reserved for future use
24 Display Controller Trip Alarm: DTT dc trip current sensed for more than 500 ms.
25 Display Controller Trip Alarm: Current Sense circuit failure.
27 Display Controller Trip Alarm: DC trip current sensed for more than 500 ms.
Alarm codes beginning with a "3" or a "4" point out conditions detected in other modules in the RFL 9300. These
can only be cleared when the condition causing the alarm has returned to normal.
RFL 9300 RFL Electronics Inc.
May 5, 2002 28 - 1 (973) 334-3100
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