Data Sheet
GE
CAR0812DC Series DC-DC Converter
Input: -36VDC to -75VDC; Output: +12 VDC @ 850W; 3.3VDC or 5 VDC @ 1A
Status_word (79): returns two bytes of information. The upper
EEPROM
byte bit functionality is tabulated in the Status_word section.
The lower byte bit functionality is identical to Status_byte.
The microcontroller has 96 bytes of EEPROM memory available
for the system host.
Fan_speed (D7): This register can be used to ‘read’ the fan
speed in adjustment percent (0 – 100%) or set the fan speed in
adjustment percent (0 – 100%). The speed of the fan cannot
be reduced below what the power supply requires for its
operation. The register value is the percent number, it is not in
linear format.
A separate EEPROM IC, with write protect features, provides
another 128 bytes of memory. Minimum information to be
included in this separate EEPROM: model number, revision,
date code, serial number etc.
Invalid commands or data: The power supply notifies the
MASTER if a non-supported command has been sent or invalid
data has been received. Notification is implemented by setting
the appropriate STATUS and ALARM registers and setting the
SMBAlert# flag.
LEDs
Two LEDs are located on the front faceplate. The INPUT OK LED
provides visual indication of the INPUT signal function. When
the LED is ON GREEN the power supply input is within normal
design limits.
Control and Read accuracy:
The second LED DC/FLT provides visual indication of three
different states of the power supply. When the LED is GREEN
then there are no faults and the DC output is present. When
the LED is AMBER then a fault condition exists but the power
supply still provides output power. When the LED is RED then a
fault condition exists and the power supply does not provide
output power.
The estimates below are believed to be reasonable under most
operating conditions. However, these are typical numbers and
not hard bound values that cannot be exceeded. In most
nominal operating conditions the returned values are
significantly better than these estimates.
FUNCTION
ACCURACY
± 2%
Vout_command
Vout_OV_fault_limit
Iout_OC_warn_limit
OT_warn_limit
Vin_UV_warn_limit
Vin_UV_fault_limit
Read_Vin
± 3%
± 4% of FL
± 5C
± 3%
± 3%
± 3%
± 2%
Read_Vout
± 4% of FL
Read_Iout
± 5C
Read_temperature
Alarm/LED indicator Table
LED Indicator
Monitoring Signals
LED1
Tri-Color LED2
Test Condition
Normal Operation
Low or NO INPUT
OVP
INPUT OK
Green
Off
DC OK
Green
Red
FAULT
High
Low
DC OK
High
Low
INPUT OK
High
TEMP OK
High
High
High
High
Low
1
2
3
4
5
6
7
Low
Green
Green
Green
Green
Green
Red
Low
Low
High
Red
Over Current
Low
Low
High
Orange
Red
Temp Alarm Warning
Fault Over Temp
Remote ON/OFF
High
Low
High
Low
High
High
Low
Red
Low
Low
High
High
Note: Test condition #2 had 2 modules plug in. One module is running and the other one is with no Input.
April 23, 2013
©2013 General Electric Company. All rights reserved.
Page 14
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