/CDF/DOC/PUBLIC/5955

Linear Power Supply

**Three Phase, 208Volt, 400Hz Input**

**One KW / Low Noise / Five Output**

**for VIPA Subracks on the CDF Calorimeter**

**Specification \# CDF/ SO-21NOV98**

**Stanley Orr, PE**

**December 1998**

**Approved : \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_**

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Power Engineering Industries Nov 19, 1998 Specification \# CDF/
SO-21NOV98/REV1-6JAN99

**1KW 5 OUTPUT LINEAR POWER SUPPLY**

TECHNICAL DESCRIPTION AND SPECIFICATIONS

**1. GENERAL**

1.1. The 19" rack-mounted, linear power supply is designed referencing
the requirements of Fermilab Specification \# CDF/SO - 040798 as
applicable to the new output ratings.

The Power Supply Input source will be 208VAC, three phase, 400hz.

The Power Supply Outputs will be :

Output 1 + 5.0 VDC @ 80A

Output 2 +5.0 VDC @ 20A

Output 3 -5.2 VDC @ 25A

Output 4 +15 VDC @ 26A

Output 5 - 15 VDC @ 7A

The Power Supply size will be 19"w \* 5.25"h \* 19"d

1.2. The Power Supply will comply with the following standards :

1.2.1 National Electrical Code

1.2.2 NEMA

1.2.3 ANSI

1.2.4 IEEE Std 1100-1992

1.2.5 IEC61000

1.3 The reliability of the Power Supply will approach 200,000 hours
MTBF.

1.4 The Power Supply will comply with IEC6100 recommendations for
Conducted and Radiated EMI. The input and outputs will be EMI filtered.

1.5 The Power Supply will be standard 19" rack-mount, 5.25" (3U) high
and 19" deep.

It will be forced air cooled with air inlets on each side ( one fan per
side ) and outlet air on the back.

1.6 RS-485 will be provided for remote monitoring of DC output voltages
and power supply status.

**2. POWER CIRCUIT DESCRIPTION**

2.1 Power circuit design will consist of the following main components :

2.1.1 Three phase input circuit breaker with provision for under-voltage
release.

2.1.2 EMI Filter

2.1.3 Three phase isolation transformers with internal shields

2.1.4 Three phase rectifiers

2.1.5 Symmetrical DC ripple filters

2.1.6 Series transistor banks

2.1.7 Output HF/EMI filters

2.2 The Power Supply input source will be 208VAC, three phase, 400hz.
The operating voltage range will be from 191VAC to 218VAC according to
ANSI C84.1-1989 for Voltage Range A.

2.3 Input cable and wire size of #14AWG will be rated for 400hz
operation with derating per IEEE Std. 1100-1992, Section 9.12.4. The
input cable will be 3 feet long, with 20A plug connector.

2.4 All DC output terminals will be properly sized studs located on the
back panel. Remote voltage feedback ( sense) will be provided as well.

5.  Common Mode high frequency filtering to frame/ground will be
    provided on the three- phase input lines as well as on each DC
    output busses.

**3. PERFORMANCE**

3.1 Input Voltage 208VACnom, 3PH, 3W + Gnd

3.2 Input Voltage Range 191-218 VAC

3.3 Input Frequency 400Hz

3.4 Input Power Factor \> 0.90 @ rated output power &

nom. AC line voltage

3.5 Inrush current 20-30A for 3 cycles

3.6 Input Isolation 1.5Kv for 1 min.

3.7 OUTPUTS

3.7.1 Output 1 + 5.0 VDC @ 80A

3.7.2 Output 2 +5.0 VDC @ 20A

3.7.3 Output 3 -5.2 VDC @ 25A

3.7.4 Output 4 +15 VDC @ 26A

3.7.5 Output 5 - 15 VDC @ 7A

3.8 Efficiency \> 50% @ rated output power &

nominal input voltage

3.9 Output Isolation :

3.9.1 Output to Output +- 20 VDC to 2.4kHz

( Common Mode ) ( continuous rating )

3.9.2 Output to Ground 500 VDC for 1 min.

3.9.3 Input to Output 1.5kV for 1 min.

3.10 Output PARD \< 0.1%

3.11 Line Regulation \< 0.1%

3.12 Load Regulation \< 0.1% for 50% load variation

3.13 Temp Coefficient \< 100 PPM/Deg. C

3.14 Size 19" w \* 5.25" h \* 19" d

3.15 Cooling 250 CFM minimum

3.16 Operating Temperature :

3.16.1 For Specified performance +10C to +40C

3.16.2 Maximum temp range - 15C to +45C @ rated power

3.17 Front Panel controls and annunciators :

3.17.1 Circuit Breaker

3.17.2 AC On Light

3.17.3 Over-temperature light

3.17.4 RS-485 Connector

3.17.5 For Each DC Output :

3.17.5.1 DC ON/ Power Good light

3.17.5.2 DC Over/Under Voltage light

3.17.5.3 DC Overcurrent light

**4. REMOTE MONITORING**

4.1 B&B Data Acquisition Modules will be used on RS-485 interface.

4.2 B&B Data Acquisition Module Model 485SDA12 will provide voltage
readouts of Outputs 1 through 5. Input buffers to the 485SDA12 will be
differential.

4.3 B&B Model 485SDD16 will be used to monitor the status of the Power
Supply.

All inputs to the 485SDD16 will be optically isolated.

4.4 Two 9 pin D-subminiature plugs shall be used for RS-485
communication with the Power Supply. They will be located on the front
and rear panel and will allow for four- wire communication.