Emerson ControlWave Instruction Manual page 145

LED Indicators on the RPSSM
Revised Nov-2010
Redundant Power Supply Sequencer Module (RPSSM)
Three light emitting diodes (LEDs) are visible through the front cover of
the RPSSM (see Figure P-10). Table P-3 describes their functions.
LED label (when lit)
PWR GOOD
MC (Master Clear)
PWR DOWN
Figure P-10. LED Locations
Each power supply on the RPSSM also has an LED which lights when
power is good. If this LED does not light, remove the power supply and
check the fuse. Then ensure that the board is fully inserted.
Installation and Use
Table P-3. LED Descriptions
Color
Meaning
Green Lights when power is within correct range,
and remains on as long as power to unit
remains within normal operating ranges.
Red Lights when the CPU is not running, and
I/O has been reset to 0. This lights
momentarily when the unit first powers on
or when the unit resets.
Red Lights when power has fallen below
acceptable levels.
P-9