GE Industrial Solutions CAR2012TE series - Manual (Page 7)

GE Data Sheet
CAR2012TE series rectifier
Input: 85Vac to 264Vac; Output: 12 Vdc @ 2000W; 3.3Vdc or 5 Vdc @ 4A
February 9, 2014 ©2013 General Electric Company. All rights reserved. Page 7
Control and Status
Control hierarchy: Some features, such as output voltage,
can be controlled both through hardware and firmware. For
example, the output voltage is controlled both by a signal pin
(Vprog) and a PMBus command, (OPERATION) .
Unless otherwise noted, the signal pin controls the feature
until the firmware command is executed. However, once the
firmware command has been executed, the signal pin is
ignored. In the above example, the power supply will no
longer ‘listen’ to the Vprog pin if the OPERATION command
has been executed.
In summary, Vprog is utilized for initialized configuration of
the output voltage and to change the output voltage when
PMBus is not used for that function.
Analog controls: Details of analog controls are provided in
this data sheet under Signal Definitions.
Common ground: All signals and outputs are referenced to
Output return. These include ‘Vstb return’ and ‘Signal return’.
Delayed overcurrent shutdown during startup: Power
supplies are programmed to stay in a constant current state
for up to 20 seconds during power up. This delay has been
introduced to permit the orderly application of input power to
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.
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.
Restart after a latchoff: PMBus™ fault_response commands
can be configured to direct the power supply to remain
latched off for 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.
Control Signals
MCU Device address: Address bits A2, A1, A0 configure the
specific address of the power supply. With these four bits, up
to sixteen (8) modules to be addressed on a single I²C bus.
The pins are pulled HI internal to the power supply. For a logic
LO these pins should be connected to ‘Output Return’. The
least significant bit x (LSB) of the address byte is set to either
write [0] or read [1]. A write command instructs the power
supply. A read command accesses information from the
power supply.
Device Address Address Bit Assignments
(Most to Least Significant)
MCU Cx 1 1 0 0 A2 A1 A0 R/W
Broadcast 00 0 0 0 0 0 0 0 0
Global Broadcast: This is a powerful command because it
instruct all power supplies to respond simultaneously.. A read
instruction should never be accessed globally. The power
supply should issue a ‘invalid command’ state if a ‘read’ is
attempted globally.
For example, changing the ‘system’ output voltage requires
this capability so that all paralleled power supplies change
their output simultaneously. This command can also turn OFF
the ‘main’ output or turn ON the ‘main’ output of all power
supplies simultaneously. Unfortunately, this command does
have a side effect. Only a single power supply needs to pull
down the ninth acknowledge bit. To be certain that each
power supply responded to the global instruction, a READ