RFL 9300 RFL Electronics Inc.
August 9, 2001 9 - 6 (973) 334-3100
Display Controller Reset
If there are no SINGLE-POLE CHASSIS ALARMS once the Power-Up interval is completed, the only time that the
interface message will be transmitted with bit 7 set equal to a logic 0, is when the Display Controller transmits a
reset signal. In that case the message will be transmitted to the single-pole logic with all target bits set at logic 0.
Single Pole Logic Reset
Note that when the single-pole logic is configured for three-pole trip, the reset signal is ignored if there is an ac-
tive trip on any phase. This differs from the single-pole case where the reset signal is processed on a phase-by-
phase basis.
9.3 OSCILLOGRAPHY BOARD
9.3.1 DESCRIPTION
The oscillography board in the RFL 9300 display module performs the following functions:
1. Drives an audible sounder that alerts the operator of an alarm condition.
2. Reads the TRIP and DTT inputs.
3. Reads the Auxiliary Current Transformer (ACT) outputs.
4. Controls the LED indicators along its front edge.
5. Constantly reads and stores current values from all four ACT’s.
6. Stores oscillography records of 200 ms of current values.
7. Outputs the stored oscillography record upon request from the display controller.
8. Demodulates the IRIG-B signal for use in the oscillography board and the display controller board.
9.3.2 CONTROLS AND INDICATORS
Figure 9-3 shows the location of all controls and indicators on the oscillography board. These controls and indi-
cators are described below. Those described as front-panel controls are accessible with the RFL 93B DISPLAY
installed in the RFL 9300 chassis; all others are only accessible when the RFL 93B DISPLAY is removed from
the chassis, or is placed on card extenders.
To Next Page
Loading...