GE Industrial Solutions CAR2548FP series - Manual (Page 9)

GE Data Sheet
CAR2548FP series rectifier
Input: 90Vac to 264Vac; Output: 48Vdc @ 2500W; 3.3Vdc or 5 Vdc @ 1A
March 28, 2013 ©2013 General Electric Company. All rights reserved. Page 9
executing a read back. This delay will ensure that only the
final state of the power supply is captured.
Successive read backs: Successive read backs to the power
supply should not be attempted at intervals faster than every
one second. This time interval is sufficient for the internal
processors to update their data base so that successive
reads provide fresh data.
PMBus TM Commands
Standard instruction: Up to two bytes of data may follow an
instruction depending on the required data content. Analog
data is always transmitted as LSB followed by MSB. PEC is
optional and includes the address and data fields.
1 8 1 8 1
S Slave address Wr A Command Code A
8 1 8 1 8 1 1
Low data byte A High data byte A PEC A P
Master to Slave Slave to Master
SMBUS annotations; S – Start , Wr – Write, Sr – re-Start, Rd
– Read,
A – Acknowledge, NA – not-acknowledged, P – Stop
Standard READ: Up to two bytes of data may follow a READ
request depending on the required data content. Analog
data is always transmitted as LSB followed by MSB. PEC is
mandatory and includes the address and data fields
. PEC is
optional and includes the address and data fields.
1 7 1 1 8 1
S Slave address Wr A Command Code A
1 7 1 1 8 1
Sr Slave Address Rd A LSB A
8 1 8 1 1
MSB A PEC No-ack P
Block communications: When writing or reading more than
two bytes of data at a time BLOCK instructions for WRITE and
READ commands must be used instead of the Standard
Instructions Error! Reference source not found. write any
number of bytes greater than two.
Block write format:
1 7 1 1 8 1
S Slave address Wr A Command Code A
8 1 8 1 8 1
Byte count = N A Data 1 A Data 2 A
8 1 8 1 8 1 1
………. A Data 48 A PEC A P
Block read format:
1 7 1 1 8 1
S Slave address Wr A Command Code A
1 7 1 1
Sr Slave Address Rd A
8 1 8 1 8 1
Byte count = N A Data 1 A Data 2 A
8 1 8 1 8 1 1
………. A Data 48 A PEC NoAck P
Linear Data Format The definition is identical to Part II of the
PMBus Specification. All standard PMBus values, with the
exception of output voltage related functions, are
represented by the linear format described below. Output
voltage functions are represented by a 16 bit mantissa.
Output voltage has a E=9 constant exponent.
The Linear Data Format is a two byte value with an 11-bit,
two’s complement mantissa and a 5-bit, two’s complement
exponent or scaling factor, its format is shown below.
Data Byte High Data Byte Low
Bit 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
Exponent (E) Mantissa (M)
The relationship between the Mantissa, Exponent, and Actual
Value (V) is given by the following equation:
E M V 2
 
Where: V is the value, M is the 11-bit, two’s
omplement mantissa, E is the 5-bit, two’s complement
exponent
PMBus TM Command set:
Command
Hex
Code
Data
Byte Function
Operation 01 1 Output ON/OFF
ON_OFF_config 02 1 09, output ON default
Clear_faults 03 0 Clear Status
Write_protect 10 1 Write control
Store_default_all 11 0 Store permanently
Restore_default_all 12 0 Reset defaults
Capability 19 1 30h, 400kHz, SMBAlert
Vout_mode 20 1 Vout constants
Vout_command 21 2 Set Vout
Fan_command_1 3B 2 Set fan speed in RPM
Vout_OV_fault_limit 40 2 Set OV fault limit
Vout_OV_fault_response 41 1
Vout_OV_warn_limit
42 2 Set OV warn limit
Vout_UV_warn_limit 43 2 Set UV warn limit
Vout_UV_fault_limit 44 2
Vout_UV_fault_response 45 1
Iout_OC_fault_limit 46
2
Iout_OC_fault_response 47 1 Latch or hiccup
Iout_OC_warn_limit 4A 2 Set OC warn limit
OT_fault_limit 4F 2
OT_fault_response 50 1 Latch or hiccup
OT_warn_limit 51 2 Set OT warn limit
UT_warn_limit 52 2