GE

CAR1248TN series rectifier

Input: 90Vac to 264Vac; Output: -54Vdc @ 1200W

November 20, 2012

©2012 General Electric Company. All rights reserved.

Page 6

voltage program value via i2c.

The value of Vprog can range from 2.1V to 2.8V.

Example: set the output to 44Vdc. From the equation

determine that Vprog = 2.2. The 10bit D/A is set for the range

of 0 – 5Vdc, therefore with a resolution of 1024 bits each bit is

0.00488V. So the corresponding value to enter is 2.2/0.00488 =

451 decimal. This corresponds to 01C3h. The data should be

sent across the bus as LSB [C3] followed by MSB [01].

and recovery levels. The default values are;

OT trip: 120C corresponds to 1.03/0.005 = D3h

OT recover: 110C that corresponds to 1.26/0.00488 = 0102h

Example: Change the recovery temperature to 100C. In the

look up table above the corresponding level is 1.54. Divide by

the conversion ration, 1.54/0.00488 = 315 dec. Converting to

its hex equivalent yields 013B hex. The data should be sent

across the bus as LSB [3B] followed by MSB [01].

comparator level. The default values are;

DC_OK_HI: 0221h, corresponding to 55.6V

DC_OK_LO: 0201h, corresponding to 52.4V

Example: Change the upper level of comparison to 55V.

Determine the corresponding register value setting; 55/0.102

= 539dec. This is equivalent to 021Bh. The data should be

sent across the bus as LSB [1B] followed by MSB [02].

two bytes but ignore the MSB.

stored in the EEPROM section of the micro controller starting

from register location 0Dh. Each byte of data needs to be

stored into its specific register location, one byte at a time.

External EEPROM

A separate EEPROM, with its own i2c address and with

write_protect capability, provides 128 bytes of memory. This is

a standard i2c compliant generic EEPROM with a single byte

for its memory location. Standard i2c command structure

applies.

The following FRU_ID information is stored in this EEPROM

Start

Location

Length

Value

Description

00h

7

Serial number, ascii

07h

1

20h

space

08h

4

Date code [YYWW] ascii

0Ch

1

20h

space

0Dh

17

Code CAR1248TNBXXZ01A ascii

1Eh

1

20h

space

1Fh

1

Revision

LEDs

Three LEDs are located on the front faceplate. The AC_OK LED

provides visual indication of the INPUT signal function. When

the LED is ON GREEN the power supply input is within normal

design limits.

When the DC_OK LED is GREEN the DC output is present.

When the FAULT_LED is RED then a fault condition exists and

the power supply may not provide output power. The table

below further defines these states:

Alarm Table

Test Condition

LED Indicator

Monitoring Signals

AC OK

DC OK

FAULT

FAULT

DC OK

AC OK

TEMP OK

1

Normal Operation

Green

Green

OFF

High

High

High

High

2

Low or NO INPUT

OFF

OFF

OFF

High

Low

Low

High

3

OVP

Green

OFF

Red

Low

Low

High

High

4

Over Current

Green

OFF

Red

High

Low

High

High

5

Over Temp Fault

Green

OFF

Red

Low

Low

High

Low

Note: Test condition #2 has 2 modules working in parallel. One module is running and the other has no AC.