GE Industrial Solutions CAR2912TE series - Manual (Page 19)

GE
Preliminary Data Sheet
CAR2912TE series front-end
Input: 90Vac to 264Vac; Output: 12Vdc @ 2900W; 3.3 or 5Vdc @ 4A Standby
October 21, 2013 ©2013 General Electric Company. All rights reserved. Page 19
a subset of paralleled front-ends during power up. If the
overload persists beyond the 20 second delay, the front-end
will revert back into its programmed state of overload
protection.
Unit in Power Limit or in Current Limit: When output
voltage is > 10V
DC
the Output LED will continue blinking.
When output voltage is < 10V
DC
, if the unit is in the RESTART
mode, it goes into hiccup. When the unit is ON the output LED
is ON, when the unit is OFF the output LED is OFF.
When the unit is in latched shutdown the output LED is
OFF.
Restart after a latchoff: PMBus™ fault_response commands
can be configured to direct the power supply to remain
latched off for over_voltage, over_temperature and
over_current.
To restart after a latch off either of five restart mechanisms
are available.
1. The hardware pin Remote ON/OFF may be cycled
OFF and then ON.
2. The unit may be commanded to restart via i2c
through the Operation command by cycling the
output OFF followed by ON.
3. Remove and reinsert the unit.
4. Turn OFF and then turn ON AC power to the unit.
5. Changing firmware from latch off to restart.
Each of these commands must keep the power supply in the
OFF state for at least 2 seconds, with the exception of
changing to restart.
A successful restart shall clear all alarm registers, set the
restarted successful bit of the Status_2 register.
A power system that is comprised of a number of power
supplies could have difficulty restarting after a shutdown
event because of the non-synchronized behavior of the
individual power supplies. Implementing the latch-off
mechanism permits a synchronized restart that guarantees
the simultaneous restart of the entire system.
A synchronous restart can be implemented by;
1. Issuing a GLOBAL OFF and then ON command to all power
supplies,
2. Toggling Off and then ON the ENABLE signal
3. Removing and reapplying input commercial power to the
entire system.
The power supplies should be turned OFF for at least 20 – 30
seconds in order to discharge all internal bias supplies and
reset the soft start circuitry of the individual power supplies.
Auto_restart: Auto-restart is the default configuration for
over-current and over-temperature shutdowns. These
features are configured by the PMBus™ fault_response
commands
An overvoltage shutdown is followed by three attempted
restarts, each restart delayed 1 second, within a 1 minute
window. If within the 1 minute window three attempted
restarts failed, the unit will latch OFF. If within the 1 minute
less than 3 shutdowns occurred then the count for latch OFF
resets and the 1 minute window starts all over again.
Fault management
The power supply recognizes that certain transitionary states
can occur before a final state is reached. The STATUS and
ALARM registers will not be frozen into a notification state
until the final state is reached. Once a final state is reached
the SMBAlert# signal is set and the STATUS and ALARM
registers will not get reinstated until a clear_faults is issued by
the master. The only exception is that additional state
changes may be added to the original list if further changes
are noted.
The power supply differentiates between internal faults that
are within the power supply and external faults that the
power supply protects itself from, such as overload or input
voltage out of limits. The FAULT LED, FAULT PIN or i2c alarm is
not asserted for EXTERNAL FAULTS. Every attempt is made to
annunciate External Faults. Some of these annunciations can
be observed by looking at the input LEDs. These fault
categorizations are predictive in nature and therefore there is
a likelihood that a categorization may not have been made
correctly.
Input voltage out of range:
The Input LED will continue
blinking as long as sufficient power is available to power the
LED. If the input voltage is completely gone the Input LED is
OFF.
State change definition
A state_change is an indication that an event has occurred
that the MASTER should be aware of. The following events
shall trigger a state_change;
• Initial power-up of the system when AC gets turned ON .
This is the indication from the power supply that it has
been turned ON.
• Whenever the power supply gets hot-plugged into a
working system. This is the indicator to the system
(MASTER) that a new power supply is on line.
• Any changes in the bit patterns of the STATUS and
ALARM registers are a STATUS change which triggers the
SMBALERT# flag.
Note that a host-issued command such as turning the output
OFF will not trigger an SMBAlert# even though the STATUS
registers will change to indicate the latest state of the power
supply.
Hot plug procedures
Careful system control is recommended when hot plugging a
power supply into a live system. It takes about 15 seconds for
a power supply to configure its address on the bus based on
the analog voltage levels present on the backplane. If
communications are not stopped during this interval, multiple
power supplies may respond to specific instructions because
the address of the hot plugged power supply always defaults
to xxxx000 (depending on which device is being addressed