Using The Led Number As A Reference - GE Mark VIeS System Manual

Unless specified, each LED is turned on to indicate OK operation. In order to keep the LED operation simple, the LEDs only
reflect the status of the first board of any type in the system. The application driven LEDs are used if there is a desire to
visually indicate some aspect of a dual–board arrangement.
Using the LED number as a reference, a detailed description of the operation of each LED follows:
1. This LED indicates that the PBUS power on JPDS that feeds the R control is within 28 V ±5%. In the case where two
JPDS boards are used the LED reflects the status of the board that holds the PPDA I/O pack. Since JPDS is the host for
the PPDA this LED should always be functional.
2. This is the same as LED #1, except it uses the magnitude of the S power bus.
This is the same as LED #1, except it uses the magnitude of the T power bus.
3.
4. This LED is driven from the status feedback switch that may be wired into the JPDS R power bus power supply input
connector. The sense of the LED is to turn it on when the switch is closed.
5. This is the same as LED #4, except it uses the switches from the S power supplies.
This is the same as LED #4, except it uses the switches from the T power supplies.
6.
7. The JPDS has three Aux outputs protected by self-resetting fuses. This LED indicates that all three outputs, JAR, JAS,
and JAT, are providing output voltage.
This LED is driven by a signal space input to the PPDA from application code.
8.
9. The JPDE creates a high-reliability 24 V or 48 V dc bus using a battery input and other sources. This LED indicates that
the bus is above a specified threshold that indicates sufficient voltage. Voltage is read as the difference between the
positive and negative dc voltage inputs.
10. The JPDE dc voltage is typically centered on earth such that each voltage input indicates about half of the total dc volts.
If there is a ground on the dc system most of the voltage will appear on one or the other dc signal. This LED is turned on
when the dc is centered within a specified threshold.
11. This LED indicates that JPDE connectors JS1, JS2, and JS3 have voltage present.
12. This LED indicates that JPDE connectors JFA, JFB, and JFC have voltage present.
13. This LED is driven by a signal space input to the PPDA from application code.
14. This LED is driven by a signal space input to the PPDA from application code.
15. Placeholder for future ac source selector status indication.
16. This LED is driven by a signal space input to the PPDA from application code.
PDM Power Distribution Modules
Public Information
GEH-6855_Vol_II System Guide 309