GE Industrial Solutions QBDW025A0B Barracuda Series - Manual (Page 19)

GE
Data Sheet
QBDW025A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 19
The module can provide temperature information using the
READ_TEMPERATURE_1 command. The command returns
two bytes of data in the linear format. The upper five bits [7:3]
of the high data byte form the two’s complement
representation of the exponent, which is fixed at –2 (decimal).
The remaining 11 bits are used for two’s complement
representation of the mantissa.
Note that the module’s temperature sensor is located close
to the module hot spot TH
1
(see Thermal Considerations).and
is subjected to temperatures higher than the ambient air
temperature near the module. The temperature reading will
be highly influenced by module load and airflow conditions.
Reading the Status of the Module using the PMBus
The module supports a number of status information
commands implemented in PMBus. However, not all
features
are supported in these commands. A X in the FLAG cell
indicates the bit is not supported.
STATUS_WORD : Returns two bytes of information with a
summary of the module’s fault/warning conditions.
High Byte
Bit Position Flag Default Value
15 VOUT fault 0
14 IOUT fault or warning 0
13 Input Voltage fault 0
12 X 0
11 POWER_GOOD#
(is negated) 0
10 X 0
9 X 0
8 X 0
Low Byte
Bit Position Flag Default Value
7 X 0
6 OFF 0
5 VOUT
Overvoltage 0
4 IOUT Overcurrent 0
3 VIN Undervoltage 0
2 Temperature 0
1
CML (Comm. Memory Fault) 0
0 X 0
STATUS_VOUT : Returns one byte of information relating to
the status of the module’s output voltage related faults.
Bit Position Flag Default Value
7 VOUT OV Fault 0
6 X 0
5 X 0
4 X 0
3 X 0
2 X 0
1 X 0
0 X 0
STATUS_IOUT : Returns one byte of information relating to the
status of the module’s output currentrelated faults.
Bit Position Flag Default Value
7 IOUT OC Fault 0
6 X 0
5
IOUT OC Warning 0
4 X 0
3 X 0
2 X 0
1 X 0
0 X 0
STATUS_INPUT : Returns one byte of information relating to
the status of the module’s input voltage related faults.
Bit Position Flag Default Value
7 VIN OV Fault 0
6 X 0
5 X 0
4
VIN UV Fault 0
3 Module Off (Low VIN) 0
2 X 0
1 X 0
0 X 0
STATUS_TEMPERATURE : Returns one byte of information
relating to the status of the module’s temperature related
faults.
Bit Position Flag Default Value
7 OT Fault 0
6 OT Warning 0
5 X 0
4 X 0
3 X 0
2 X 0
1 X 0
0 X 0
STATUS_CML : Returns one byte of information relating to the
status of the module’s communication related faults.
Bit Position Flag Default Value
7
Invalid/Unsupported
Command
0
6 Invalid/Unsupported Data 0
5 Packet Error Check Failed 0
4 X 0
3 X 0
2 X 0
1 X 0
0 X 0