D20/D200
Installation and Operations Guide
GE Energy
994-0078-2.00-7 General
116
Full
Operation, continued
LEDs vs. MCU
Status
The MPU Run and Fault LEDs, DS2 and DS7, together indicate the MCU’s
operating status.
MPU Run LED Fault LED Flash
Period
(s)
MCU Operating Status
Flash Off 0.1 Applications downloaded and
operating
Flash Off 0.75 Applications downloaded but not
operating
Flash
(alternating)
Flash
(alternating)
0.75 Applications not downloaded and
only ROM operating
Off Flash 0.5 EPROM checksum error
Flash
(simultaneously)
Flash
(simultaneously)
0.5 RAM error: device address error
D20 Power
Supply LEDs
On the chassis-mounted D20 Power Supplies there are LED indicators for each of
the supply voltages. The indicators are illuminated green when that voltage is
present.
D20EME LEDs
The following table explains the operational function of the four LED indicators:
Name Function
BATT 1 LED
BATT 2 LED
Lights when battery voltage drops below 3 Volts. Replace
battery immediately.
POWER LED +5 Volts power is available.
ACCESS LED Indicates D20EME is being accessed from VME bus.
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