GE Industrial Solutions CP2725AC54TE - Manual (Page 12)

GE
Data Sheet
CP2725AC54TE CPL High Efficiency Rectifier
100-120/200-277V
AC
input; Default Outputs: ±54V
DC
@ 2725W, 5V
DC
@ 4W
January 30, 2014 ©2013 General Electric Company. All rights reserved. Page 12
bit. To be certain that each power supply responded to the
global instruction, a READ instruction should be executed to
each power supply to verify that the command properly
executed. The GLOBAL BROADCAST command should only be
executed for write instructions to slave devices.
Note: The PCA9541 i2c master selector does not respond to the
GLOBAL BROADCAST command.
Read back delay: The power supply issues the SMBAlert #
notification as soon as the first state change occurred. During
an event a number of different states can be transitioned to
before the final event occurs. If a read back is implemented
rapidly by the host a successive SMBAlert# could be triggered
by the transitioning state of the power supply. In order to avoid
successive SMBAlert# s and read back and also to avoid
reading a transitioning state, it is prudent to wait more than 2
seconds after the receipt of an SMBAlert# before 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.
Device ID: Address bits A2, A1, A0 set the specific address of
the power supply. The least significant bit x (LSB) of the address
byte configures write [0] or read [1] events. In a write
command the system instructs the power supply. In a read
command information is being accessed from the power
supply.
Address Bit
7 6 5 4 3 2 1 0
PCA9541 1 1 1 0 A2 A1 A0 R/W
Micro controller 1 0 0 0 A2 A1 A0 R/W
External EEPROM 1 0 1 0 A2 A1 A0 R/W
Global Broadcast 0 0 0 0 0 0 0 0
MSB LSB
The Global Broadcast instruction executes a simultaneous
write instruction to all power supplies. A read instruction
cannot be accessed globally. The three programmable address
bits are the same for all I
2 C accessible devices within the
power supply.
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
mandatory 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
Direct mode data format: The Direct Mode data format is
supported, where y = [ mX + b ] x 10 R . In the equation, y is the
data value from the controller and x is the ‘real’ value either
being set or returned.
For example, to set the output voltage to 50.45V
DC
, Multiply the
desired set point by the m constant, 50.45 x 400 = 20,180.
Convert this binary number to its hex equivalent: 20,180b =
0x4ED4. The result is sent LSB=0xD4 first, then MSB=0x4E.
The constants are
FUNCTION Operation m b R
Output voltage
Output voltage shutdown Write / read 400 0 0
Output Current read 5 0 0
Temperature read 1 0 0
Input Voltage read 1 75 0
Input Power read 1 0 0
Fan Speed setting ( % ) read 1 0 0
Fan speed in RPM read 100 0 0
PMBus
TM Command set:
Command Hex
Code
Data
Field
Function
Operation 01 1 Output ON/OFF
Clear_Faults 03 0 Clear Status
Vout_command 21 2 Set Vout
Vout_OV_fault_limit 40 2 Set OV fault limit
Read_status D0 10 Read Status, V
out
, I
out
, T
LEDs test ON D2 0 Test LEDs
LEDs test OFF D3 0
Service_LED_ON D4 0 Service LED
Service_LED_OFF D5 0
Enable_write D6 0 Enable EEPROM write
Disable_write D7 0 Disable EEPROM write
Inhibit_restart D8 0 Latch upon failure
Auto_restart D9 0 Hiccup
Isolation_test DA 0 Perform isolation test
Read_input_string DC 2 Read Vin and Pin
Read_firmware_rev DD 3 Firmware revisions
Read_run_timer DE 3 Accumulated ON state
Fan_speed_set DF 3 Fan speed control
Fan_normal_speed E0 0 Stop fan control
Read_fan_speed E1 4 Fan control & speed
Stretch_LO_25ms E2 0 Production test feature
Command Descriptions
Operation (01h) : By default the Power supply is turned ON at
power up as long as ENABLE is active LO. The Operation
command is used to turn the Power Supply ON or OFF via the
PMBus. The data byte below follows the OPERATION command.
FUNCTION DATA BYTE
Unit ON 0x80
Unit OFF 0x00
To RESET the power supply cycle the power supply OFF, wait at
least 2 seconds, and then turn back ON. All alarms and
shutdowns are cleared during a restart.
Clear_faults (03h): This command clears information bits in
the STATUS registers, these include:
 Isolation OK
 Isolation test failed
 Restarted OK
 Invalid command