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THEORY OF OPERATION

Theory of Operation

The following will provide you with an outline of operations and a list of modules found in
the DC-UPS.

Modules

•

Rectifier

•

System Controller/LVD

•

Battery Module

•

Distribution and Connectors

Functional Block Diagram DC-UPS

Figure 1

Rectifier

The rectifier converts AC input power to regulated DC output power. The DC-UPS rectifier
provides up to 320 watts of power. The input of the rectifier is fused for protection...

System Controller/LVD

The System Controller has the following functions:

•

Distribution of the DC power

•

Battery charge voltage and current control and monitoring

•

Battery Low Voltage Disconnect Function (LVD)

•

Battery charge and test status indicators

•

Automatic and manual battery test

•

Local and Remote Alarms (optional)

LED Indicators

There are two LED indicators on the front of the unit; Battery Charge Status and Battery
Test Status. The functions of these indicators are as follows:

RECTIFIER

SYSTEM

CONTROLLER

DISTRIBUTION

MODULE

BATTERY

PACK

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Содержание SEI-125

Страница 1: ...Installation and Operations Manual SEI DC UPS 24VDC SEI Incorporated 5115 Pegasus Court Suite Q Frederick Md 21704 Phone 301 694 9601 Fax 301 694 9608 Email Info seipower com Web http www seipower com ...

Страница 2: ...ations 3 Environmental Specifications 3 Safety Information 4 Installation Instructions 5 Startup and Checkout 7 Theory of Operation 8 Remote Alarm Option 10 Power Management Package Option 10 Repair and Maintenance 11 Output Module A 12 Output Module M 13 Output Module P 14 ...

Страница 3: ...tput distribution modules are available The M module contains two individually fused 8 pin Molex Minifit connectors The A module contains two individually fused 2 pin AMP Mat N Lok connectors The P module features two sets of individually fused 10 32 studs Customer specified output modules are available The DC UPS comes equipped with field replaceable non spillable sealed lead acid battery packs C...

Страница 4: ...5 00 Inches Height 14 00 Inches Weight 32 lbs Battery Capacity 18Ahr Fuse 3AG 15A Littlefuse 0326015 or Equivalent SEI 250 Electrical Specifications Input Voltage 100 264 VAC Frequency 50 60 Hz Current 2 6 Amps Typical 115 Vac input 250 W output 5 0 Amps Max Output Voltage 21 28VDC Current 10 0 amps Mechanical Dimensions Width 19 00 Inches Depth 5 00 Inches Height 14 00 Inches Weight 32 lbs Batter...

Страница 5: ...TAL SPECIFICATIONS Temperature Operating 0 C to 40 C Storage 20 C to 50 C Humidity 0 95 non condensing Thermal Load 100 BTU hr max SAFETY INFORMATION Always insure that the person assigned to the job can perform the job safely Always lift all equipment properly Always disconnect commercial power and remove the battery fuse before working on the unit Always replace the batteries with batteries of t...

Страница 6: ...5 Service to the DC UPS should be performed by a qualified technician ...

Страница 7: ...er for damage If damaged request that the carrier inspect the shipment Unpack the inner container from the shipping container and remove the unit from the packaging Inspect the unit for visible damage If a claim for damages is to be made it should be filed promptly with the transportation company In addition notify SEI within two days of delivery SEI will advise the customer of any further procedu...

Страница 8: ...rd or equivalent is required The DC UPS should be fastened to the backboard using number ten wood screws A number 27 drill can be used to provide a pilot hole for the screws All of the screws should be tightened with a torque of 30 in lb minimum and 34 in lb maximum The unit should be mounted vertically in a clean dry area where the ambient temperature does not exceed 40 C 104 F It is important th...

Страница 9: ...tioned Attach the supplied AC power cord to the left side of the DC UPS Plug in the DC UPS power cord into the commercial AC outlet made available for this unit When power is first applied the unit should display a flashing green Battery Charge Status LED and a solid green Battery Test Status LED Connect the user equipment to the DC UPS output connectors located on the right side of the unit Verif...

Страница 10: ...f power The input of the rectifier is fused for protection System Controller LVD The System Controller has the following functions Distribution of the DC power Battery charge voltage and current control and monitoring Battery Low Voltage Disconnect Function LVD Battery charge and test status indicators Automatic and manual battery test Local and Remote Alarms optional LED Indicators There are two ...

Страница 11: ...ry Test is disabled for 5 minutes following a Battery Test In both cases the Wait Then Test indication is displayed Low Voltage Disconnect Function The low voltage disconnect function will disconnect the battery when the battery voltage drops below a 21 Vdc This is done to prevent deep discharge of the batteries which can adversely affect battery life Both internal and external batteries are disco...

Страница 12: ...nnection 5 No connection 6 AC Fail NC AC Failure has occurred 7 AC FAIL NO Operating Normally 8 AC Fail Common Figure 2 Power Management Package SEI s Power Management Package PMP for the SEI DC UPS provides a variety of functions necessary to monitor and control output power to DC powered devices as well as maximize the efficiency and reliability of the power systems and battery backup Ethernet c...

Страница 13: ...ommended that a quality digital voltmeter DVM be used Rectifier Adjustment Procedure The rectifier should only be adjusted with the nominal system load connected Connect a DVM to one of the external battery connectors Measure the voltage it should be between 27 0 and 27 7 volts If the measured voltage is outside of this range perform the following steps 1 Remove the battery fuse located on the rig...

Страница 14: ...nnector 1 480698 0 Mating Pin 350873 3 Wire Gauge 14 18 AWG Fuse GMT 15A Cooper Bussmann or Equivalent Note The fuse is sized to provide full output power from each connection If multiple connections are used the fuse can be re sized to limit current at a lower value 48V RTN 48V FUSE 1 FUSE 2 OUTPUT MODULE A Layout and Polarity ...

Страница 15: ...2085 Mating Pin 39 00 0078 Strain relief 15 04 9343 Wire Gauge 14 18 AWG Fuse GMT 10A Cooper Bussmann or Equivalent Note The fuse is sized to provide full maximum power from each connection If multiple connections are used the fuse can be re sized to limit current at a lower value 24V 24V RTN 24V 24V RTN OUTPUT MODULE M Layout and Polarity ...

Страница 16: ...s fused Fuses SEI 320 24 SEI 250 24 ATO 15A 0257015 Littlefuse or Equivalent SEI 125 24 ATO 7 5A 0257007 Littlefuse or Equivalent Note The fuse is sized to provide maximum output power from each connection If multiple connections are used the fuse can be re sized to limit current at a lower value PORT 1 PORT 2 48V 48VRTN 48V 48VRTN ...

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