GE Industrial Solutions CAR2512TE Front-End - Manual (Page 11)

GE
Preliminary Data Sheet
CAR2512TE Front-End
Input: 90V
AC
to 264V
AC
; Output: 12 V
DC
@ 2500W; 3.3/5V
DC
standby @ 15W
February 7, 2014 ©2013 General Electric Company. All rights reserved. Page 11
Register Code Bit Function
Status_word
(includes Status_byte)
79
7 OV Fault/Warning detected
6 OC Fault/Warning detected
5 Input Fault/Warning detected
4 Mfr_specific register change
detected
3 nPower_Good
2
Fan Fault or Warning
detected
1 Other fault
0 Unknown
Status_Vout 7A
7 Vout OV Fault
6 Vout OV Warning
5 Vout UV Warning
4 Vout UV Fault
3 N/A
2 N/A
1 N/A
0 N/A
Status_Iout 7B
7 IOUT OC Fault
6 N/A
5 IOUT
OC Warning
4 N/A
3 N/A
2 N/A
1 N/A
0 N/A
Status_input 7C
7 Vin OV Fault
6 Vin OV Warning
5 Vin UV Warning
4 Vin UV Fault
3 N/A
2 N/A
1 N/A
0 N/A
Status_temperature 7D
7 OT Fault
6 OT Warning
5 N/A
4 N/A
3 N/A
2 N/A
1 N/A
0 N
/A
Status_fan_1_2 81
7 Fan 1 Fault
6 Fan 2 Fault
5 N/A
4 N/A
3
Fan 1 Speed Overridden
2 Fan 2 Speed Overridden
1 N/A
0 N/A
Status_mfr_specific 80
7 3.3V_fault
6 OVSD
5 Interrupt
4 Fault
detected
3 PS_remote_OFF
2 DC
Fault
1 Input Fault
0 0 – AC high line,
1 – AC low line
Command Descriptions
Operation (01) : By default the Power supply is turned ON at
power up as long as Power ON/OFF signal pin is active HI. 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 80
Unit OFF 00
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 (03): This command clears all STATUS and FAULT
registers and resets the SMBAlert# line.
If a fault still persists after the issuance of the clear_faults
command the specific registers indicating the fault are reset
and the SMBAlert# line is activated again.
WRITE_PROTECT register (10): Used to control writing to the
PMBus device. The intent of this command is to provide
protection against accidental changes. All supported
command parameters may have their parameters read,
regardless of the write_protect settings. The contents of this
register can be stored to non-volatile memory using the
Store_default_code command. The default setting of this
register is disable_all_writes except write_protect 0x80h.
FUNCTION DATA BYTE
Enable all writes 00
Disable all writes except write_protect 80
Disable all writes except write_protect and
OPERATION
40
Vout_Command (21) :
This command is used to change the
output voltage of the power supply. Changing the output
voltage should be performed simultaneously to all power
supplies operating in parallel using the Global Address
(Broadcast) feature. If only a single power supply is instructed
to change its output, it may attempt to source all the required
power which can cause either a power limit or shutdown
condition.
Software programming of output voltage permanently
overrides the set point voltage configured by the Vprog signal
pin. The program no longer looks at the ‘Vprog pin’ and will not
respond to any hardware voltage settings. If power is removed
from the µController it will reset itself into its default
configuration looking at the Vprog signal for output voltage
control. In many applications, the Vprog pin is used for setting
initial conditions, if different that the factory setting. Software
programming then takes over once I
2 C communications are
established.
To properly hot-plug a power supply into a live backplane, the
system generated voltage should get re-configured into either
the factory adjusted firmware level or the voltage level
reconfigured by the margin pin. Otherwise, the voltage state
of the plugged in power supply could be significantly different
than the powered system.
Vout_OV_warn_limit (42): OV_warning is extremely useful
because it gives the system controller a heads up that the
output voltage is drifting out of regulation and the power
supply is close to shutting down. Pre-amative action may be
taken before the power supply would shut down and
potentially disable the system.