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CAR2512TE Datenblatt(PDF) 7 Page - Lineage Power Corporation |
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CAR2512TE Datenblatt(HTML) 7 Page - Lineage Power Corporation |
7 / 15 page GE Preliminary Data Sheet CAR2512TE Front-End Input: 90VAC to 264VAC; Output: 12 VDC @ 2500W; 3.3/5VDC standby @ 15W February 7, 2014 ©2012 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 the signal pin (Vprog) and the PMBus command, (Vout_command) . Using output voltage as an example; the Vprog signal pin has ultimate control of the output voltage until the Vprog is either > 3VDC or a no connect. When the programming signal via Vprog is either a no connect or > 3VDC, it is ignored, the output voltage is set at its nominal 12VDC and the unit output voltage can be controlled via the PMBus command, (Vout_command). 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 ‘VSTDBY return’ and ‘Signal return’. reset the soft start circuitry of the individual power supplies. Auto_restart: Auto-restart is the default configuration for recovering from over-current and over-temperature shutdowns. 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 less than 3 shutdowns occur within the 1 minute window then the count for latch OFF resets and the 1 minute window starts all over again. Restart after a lachoff: To restart after a latch_off either of four restart mechanisms are available. The hardware pin Remote ON/OFF may be turned OFF and then ON. The unit may be commanded to restart via i2c through the Operation command by first turning OFF then turning ON . The third way to restart is to remove and reinsert the unit. The fourth way is to turn OFF and then turn ON ac power to the unit. The fifth way is by 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. 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 Remote ON/OFF signal 3. Removing and reapplying input commercial power to the entire system. It is good practice to turn OFF the power supplies for about 20 – 30 seconds in order to discharge all internal bias supplies and reset the soft start circuitry of the individual power supplies. Control Signals All signals are referenced to ‘Signal Return’. Device addressing: The microcontroller (MCU) and the EEPROM have the following addresses: Device Address Address Bit Assignments (Most to Least Significant) MCU 0xBx 1 0 1 1 A2 A1 A0 R/W Broadcast 0x00 0 0 0 0 0 0 0 0 EEPROM 0xAx 1 0 1 0 A2 A1 A0 R/W Address lines (A2, A1, A0): These signal pins allow up to eight (8) modules to be addressed on a single I²C bus. The pins are pulled HI internally. For logic LO connect to ‘Output Return’. 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 an ‘invalid command’ state if a ‘read’ is attempted globally. For example, changing the ‘system’ output voltage requires the global broadcast 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 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. Voltage programming (Vprog): An analog voltage on this signal can vary the output voltage ± 10% of nominal, from 10.8VDC to 13.2VDC. The equation of this signal is: VOUT = 10.8 (Vprog * 0.96) where Vprog = 0 to 2.5VDC Between 2.5 and 3V the output stays at 13.2VDC. If Vprog is > 3V, or left open, the programming signal is ignored and the unit output is set at the setpoint of 12VDC. Load share (Ishare): This is a single wire analog signal that is generated and acted upon automatically by power supplies connected in parallel. The Ishare pins should be tied together for power supplies if active current share among the power supplies is desired. No resistors or capacitors should get connected to this pin. Remote_ON/OFF: Controls presence of the 12VDC output voltage. A logic LO on this signal pin turns OFF the 12VDC output. Interlock: This is a short signal pin that controls the presence of the 12VDC main output. This pin should be connected to ‘output return’ on the system side of the output connector. The purpose of this pin is to ensure that the output turns ON after engagement of the power blades and turns OFF prior to disengagement of the power blades. |
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