Emerson SDU DC DIN Rail UPS Specification Sheet
Contents
1. 3 BATTERY MODE BATTERY CHARGE Amber LED The amber LED illumi nates when the UPS is supplying battery power to the loads The LED flashes when the battery is charging 4 INPUT POWER OK Green LED The green LED will illuminate when the dc input power is normal 5 Dc Input Output Screw Terminal Connections IP20 rated input and output screw terminals acceptable wiring 16 12 AWG copper conductor 90 C GOOO Input DC Output DC 24V 24V NOTE The maximum length of the connection between the power module and battery is 6 ft 1 85 m 6 Dry Contact Relay Terminals The power module incorporates dry relay contacts for remote signaling of the battery status terminal connection for remote ON OFF and output dc 24 V 35 mA for powering the auxiliary circuit Acceptable wiring 16 12 AWG copper conductor 90 C 29 2991 e 22999229 92 11 10 I Lti t f I 4 OUTPUTDC REMOTE NC C NO NC C NO NC C NO 24V 35mA ON OFF BATERYFAULT ON BATERY LOW BATERY 7 Polarized Terminal Connections for the Battery red color black color Composed of two PP 15 45 Anderson contacts and two PP 15 45 Anderson powerpole housings to ensure a keyed connection between the power module and the battery module 0000000000 0000000000 i ooo0000000 Bottom View oo a ee oo00o00 o a m T a o oO m o oO oO oO SDU DC Series Instruction Manual 13 9 0 Alarms 9 1 ON Battery Slow B2. This should take about 4 seconds Release the ON OFF TEST button the UPS is now ON with the Green Mode enabled The green LED will now double flash for a period of 5 seconds and then remain solid green for 55 seconds This pattern will be repeated every minute To deactivate the Green Mode the UPS must be turned OFF using the ON OFF TEST button and restarted using the Normal Mode seguence See 7 8 7 9 1 About the Green Mode The Green Mode is an energy saving feature that prevents the UPS battery from being deeply discharged in the case of an extended power outage If during a power outage the UPS detects a battery load power of less than 15 watts the UPS will shut down after 3 minutes of low power operation The UPS will then beep every 30 seconds indicating that it is now in the power saving mode When power is restored to the system the UPS will automatically restart in the Green Mode Note that if the power outage lasts longer than 72 hours the UPS will completely turn OFF and will have to be manually restarted in the selected ON Mode using the ON OFF TEST button 7 10 Remote ON OFF To activate the Remote ON OFF function connect a remote push button switch to the ON OFF terminal as shown below The Remote ON OFF switch provides the same functions as the front panel switch including the ON OFF TEST functions with the Green Mode enabled or disabled If the Green Mode is not needed a remote toggle switch can be u
3. Information SDU DC Series Instruction Manual iii 1 0 Important Safety Instructions This manual contains important safety instructions that should be followed during the installation of the Uninterruptible Power System UPS Please read all safety installation and operating instructions before attempting to install or operate the UPS Please adhere to all warnings on the unit and in this manual during installa tion and operation The UPS is designed for Industrial or Commercial use and can be installed and operated by individuals without previous training 1 1 Safety Precautions Warnings To prevent the risk of fire or electric shock install the UPS in a temperature and humidity controlled ventilated enclosure free of conductive contaminants moisture flammable liquids gases and corrosive substances AWARNING PbH2504 Enclosure has to be properly ventilated if productis installed inside e Operate the UPS only from a properly grounded earthed dc supply e To reduce the risk of electric shock do not remove the cover For service contact a qualified technician e The UPS contains its own energy source batteries The output terminals may carry live voltage even when the UPS is not connected to a dc source Although your UPS has been designed and manufactured to assure personal safety improper use can result in electrical shock or fire To ensure safety please observe the following r
4. ON LED will not light input fuse Load is less than 1 4 Ain Backup Mode Other failure Call SolaHD Technical Support Normal condition disable Green Mode Loose dc input power connection Tighten the dc input power connection UPS in Backup Mode and will not Input voltage is too high too low or Adjust dc input voltage to an appro switch to dc input exceeds the specifications priate leve Other failure Call SolaHD Technical Support Battery is not fully charged Recharge the UPS for at least 8 hours Backup time is too short Other failure Call SolaHD Technical Support Continuous beep amp LED overload sae Remove the overload Refer to the Pala a Overload condition be aah indication output specifications i Recharge the battery for at least 8 Battery discharged hours Perform UPS self test RodiLED 1s flashing Battery disconnected Check battery connections Battery failure Replace the battery UPS turns on anars ik Load short circuited Remove short circuited load battery cycles For further assistance please contact SolaHD Technical Support at 800 377 4384 U S 847 268 6651 International E mail tech solahd com SDU DC Series Instruction Manual 26 15 0 Storage 15 1 Storage Conditions e Before storing charge the UPS for at least 4 hours e Store the UPS covered and upright in a cool dry location with the battery fully charged e Remove any accessories in the accessory slot and disconnect any cable
5. DU 24 BAT Wiring Diagram 7 5 SDU DC UPS with SDU 24 BATEM Wiring Diagram 7 6 Connections 7 7 Charge the Battery 7 8 Turn ON the UPS Normal Mode 7 9 Turn ON the UPS Green Mode 7 10 Remote ON OFF 8 0 Operating Instructions ruarsenanennnanannanaanannannnnnnnannanannannannnsannannnannnannanannannanannannannas 9 0 Alarms 9 1 ON Battery 9 2 Low Battery 9 3 Overload 9 4 Alarm amp LED Status Table 10 0 Replacing the Battery visscissnccseicencenescssnccestansraanvnnninvecsssnssnaannieannocseennncaaevnncuntorsasnesneanenannnoionins 0 1 SDU 24 BAT Replacement Batteries 0 2 SDU 24 BATEM Replacement Batteries 0 3 SDU 24 BAT Battery Replacement Instructions 16 18 0 4 SDU 24 BATEM Battery Replacement Instructions 11 0 Battery Backup Times 1 1 SDU 10 24 with SDU 24 BAT 1 2 SDU 20 24 with SDU 24 BAT 1 3 SDU 10 24 with SDU 24 BATEM gi 14 SDU 20 24 with SDU 24 BATEM iitvvsvitatatanasasivdkatvaatalanaantunkuna kadaaaakluudakakat aada aeu karakk aka 12 0 Power Module Specifications 13 0 Battery Module Specifications TED TroubleshOOHNG is iistensttesaaanni navanaanmsamii eemale aka aa i 26 15 0 Storage 15 1 Storage Conditions 15 2 Extended Storage 16 0 Product Registration amp Warranty erusrranrnanannnnnennsaannnnanasannsnanaannannannaanannnnnnaannananasasnsnanase 28 16 1 Product Registration 16 2 Warranty
6. SOLAND Uninterruptible Power Systems SDU DC Series Instruction Manual While every precaution has been taken to ensure accuracy and completeness in this manual SolaHD assumes no responsibility and disclaims all liability for damages resulting from use of this information or for any errors or omissions 2008 SolaHD All rights reserved throughout the world Specifications are subject to change without notice SolaHD name and logo are registered trademarks of EGS Electrical Group LLC All names referred to are trademarks or registered trademarks of their respective owners SDU DC Series Instruction Manual ii Table of Contents 1 0 Important Safety Instructions e eeraerarennnevanannannannasnnsnnnanannnenanansnnannasansnnnasansennannasennas 4 5 1 1 Safety Precautions 1 2 Conditions of Use 2 0 Warnings Defined SD OMEFOCU CHO TTT TTT 6 4 0 What s Included 9 0 Battery OP ONS ei sade sacicisd cessscacadscrsssnassisssccsosncssceacsessasesscuscencatavsuscsaaoonadsaasdcuitacedasdvscstvsbbeveesdaveuiacestaor 7 6 0 Optional Accessories x nersarennansnnannannnnnnnannanannnananannannannnnansanuanannannanannannanaanansaenanannannanans 7 7 0 Installation Instructions sisciisisiisinnennissirannesinnoinencasesttewennnicdnilsssaadeniananeseninetitennnmntddiiiantiead 8 11 7 1 Placement 7 2 DIN Rail Mounting 7 3 Chassis Mounting 7 4 SDU DC UPS with S
7. eeping When in ON Battery Mode the amber LED illuminates and a slow beep occurs The alarm is silenced when the UPS returns to Normal Mode 9 2 Low Battery Rapid Beeping When in Backup Mode if the battery capacity reaches 20 30 the UPS will beep rapidly until it shuts down from battery depletion When dc input power is restored the UPS will return to Normal Mode NOTE The alarm will sound every 30 seconds when the battery capacity is low 9 3 Overload Continuous Beeping When the UPS is subjected to an overload condition the UPS will continuously beep the red LED will illuminate and the UPS will automatically shut down Restart the UPS by pressing the ON OFF TEST button Reduce the load to elimi nate the overload condition 9 4 Alarm 8 LED Status Table Status O Green LED Amber LED Red LED Flash for5s ON for 1s apa a acai Moce or OFF for2s SDU DC Series Instruction Manual 14 10 0 Replacing the Battery 10 1 SDU 24 BAT Replacement Batteries The following battery types can be used as a replacement KEE SIHI IA HR1221W HR1221WF2 B amp B Battery USA Inc HR 5 5 12 i i WP1221W tae Batteries Industrial 12V do 5 0 Ah o Ltd WP5 12 NP5 12 FR Taiwan Yuasa Battery Co Ltd NPH5 12 J apan Storage Battery PE12V5 Toplite NP5 12 10 2 SDU 24 BATEM Replacement Batteries The following battery types can be used as a replacement Manufacturer type Rating Kung Long Batteri
8. eplaced by incorrect type Daposs of used baflenes sccorting fo instructions 5 Slide the bracket forward inside the enclosure Secure the bracket in place Use four screws to mount the bracket onto the enclosure 6 Use the following connection diagram to ensure a proper connection to the circuit breaker and polarized terminals B B D z gE ccs 36 N oe CB SDU DC Series Instruction Manual 21 10 4 SDU 24 BATEM Battery Replacement Instructions continued 7 Slide the cover onto the enclosure Secure the cover with four screws A SDU DC Series Instruction Manual 22 11 0 Battery Backup Times in minutes vs load percentage NOTE Resistive loads were used to measure the battery run times Using other types of loads may result in different battery run times 11 1 SDU 10 24 with SDU 24 BAT 20 2A 40 4A 60 6A 80 8A 100 10 A 11 3 SDU 10 24 with SDU 24 BATEM 20 2A 40 4A 60 6A 80 8A 100 10 A 11 4 SDU 20 24 with SDU 24 BATEM 20 4A 40 8A 60 12A 80 16A 100 20 A a AA a EAT EA KE SDU DC Series Instruction Manual 23 12 0 Power Module Specifications Parameter INPUT Nominal Input Voltage Input Voltage Range OUTPUT Nominal Output Voltage Output Voltage Range Output Current Current Limit PROTECTION Input Protection Overload Protection ENVIRONMENT Audible Noise Operating Temperature Storage Temperature Humidity Max
9. es Industrial WP7 2 12 12V de 72Ah Co Ltd WP1234W E KEETA KA Toplite NP7 2 12 Shimastu Electronic NP7 2 12 SDU DC Series Instruction Manual 15 10 3 SDU 24 BAT Battery Replacement Instructions A CAUTION A CAUTION A CAUTION A CAUTION When removing and installing new batteries extreme care must be used not to short the metal chassis parts across the battery terminals and not to short the batteries to each other personal injury may result Caution should be exercised when replacing the batteries as the load is unprotected from disturbances and power outages during this procedure The battery can present a risk of electrical shock and high short circuit current The following precautions should be observed when working on batteries e Remove watches rings and other metal objects e Use tools with insulated handles e Do not lay tools or other metal objects on top of the batteries e If the battery replacement kit is damaged in any way or shows signs of leakage contact your SolaHD representa tive immediately e Do not dispose of batteries in a fire they may explode e Dispose of old batteries according to local codes Electrical safety precautions must be followed when installing or servicing this equipment To prevent risk of electrical shock turn off and lock out all power sources to the unit before making electrical connections or servicing 1 Remove fou
10. her personal injury may result Caution should be exercised when replacing the battery as the load is unprotected from disturbances and power outages during this procedure The battery can present a risk of electrical shock and high short circuit current The following precautions should be observed when working on batteries e Remove watches rings and other metal objects e Use tools with insulated handles e Do not lay tools or other metal objects on top of the batteries e If the battery replacement kit is damaged in any way or shows signs of leakage contact your SolaHD representa tive immediately e Do not dispose of batteries in a fire they may explode e Dispose of old batteries according to local codes Electrical safety precautions must be followed when installing or servicing this equipment To prevent risk of electrical shock turn off and lock out all power sources to the unit before making electrical connections or servicing 1 Remove four screws from the cover Slide the cover forward and off the enclosure SDU DC Series Instruction Manual 19 10 4 SDU 24 BATEM Battery Replacement Instructions continued 2 Remove the wires from the battery posts 3 Secure the bracket in place Remove four screws from the enclosure Slide the bracket forward and off the enclosure SDU DC Series Instruction Manual 20 4 Remove the failed battery and insert the new battery Find of eaplowert tatiery m r
11. imum Elevation Shock amp Vibration INSTALLATION MTBF Relay Contact Terminal Connections Catalog Number 24 Vdc 22 5 30 V de Dc fuse 30 A 22 5 30 V de Fuse for overload and short circuit protection Electrical circuit protection UPS output cuts off immediately lt 40 dBA 1 m from surface 20 C to 50 C 20 C to 70 C 0 to 95 non condensing Degree 2 3500 m 11 483 ft According to ISTA 2A gt 200 000 hours Outputs are capable of providing high currents for short periods of time for inductive load startup or switching Fusing may be reguired for wire loads if 2x nominal O P current rating cannot be tolerated Continuous current overload allows for reliable fuse tripping Simple snap on system for DIN rail TS35 7 5 or TS35 15 or Chassis mounting brackets SDU PMBRK Input amp Output IP20 rated screw terminals connector size range 16 12 AWG 0 5 4 mm for copper conductors rated 90 C IP20 screw terminals connector size range 24 16 AWG 0 34 4 mm Fully enclosed metal housing with fine ventilation grid to keep out small particles 20 mm above 35 mm below 20 mm left and right 10 mm in front SDU DC Series Instruction Manual 24 WEIGHT amp DIMENSIONS Net Weight Ib kg 1 65 0 75 4 88 x 3 02 x 4 55 124 x 76 7 x 116 SAFETY APPROVALS UL60950 1 UL508 FCC Class A CAN CSA C22 2 No 107 1 01 CAN CSA C22 2 No 60950 1 Low voltage directive IEC 60950 1 CB Scheme Direct
12. ive 2004 108 SDU DC UPS System EC EN 62040 2 Category C2 EN 55022 Class A A1 A2 CISPR 22 Class A 2005 IEC 61000 3 2 IEC 61000 4 2 IEC 61000 4 3 IEC 61000 4 4 IEC 61000 4 5 IEC 61000 4 6 A1 IEC 61000 4 8 IEC 61000 2 2 The SDU DC UPS system includes a power module SDU 10 24 or SDU 20 24 and a battery module SDU 24 BAT or SDU 24 BATEM 13 0 Battery Module Specifications Parameter Nominal Voltage 24 V de Protection Circuit Breaker 24 V 25 A Charging Current 0 8 A Enclosure Type NEMA 1 to 90 of full capacity additional battery module wel bs Enclosure Dimensions in mm 11 5 x 5 57 x 4 57 292 x 142 x 116 Simple snap on system for DIN rail TS35 7 5 or TS35 15 or Chassis Chassis mounting brackets SDU PMBRK mounting brackets SDU PMBRK Accessories 1 ft polarized battery cable 6 ft polarized battery cable Safety Standard for SDU DC UL60950 1 UL508 IEC 60950 1 CAN CSA C22 2 No 107 1 01 UPS System CAN CSA C22 2 No 60950 1 The SDU DC UPS system includes a power module SDU 10 24 or SDU 20 24 and a battery module SDU 24 BAT or SDU 24 BATEM SDU DC Series Instruction Manual 25 14 0 Troubleshooting Probable Cause Required Action UPS is OFF or the ON OFF Test button Press the ON OFF Test button for was not pushed for 1 seconds more than 2 seconds Recharge the UPS for at least 8 hours Battery voltage is less than 22 V If the unit still does not start check the UPS is not
13. le SDU 24 BAT SDU DC Series Instruction Manual 9 7 5 SDU DC UPS with SDU 24 BATEM Wiring Diagram SDU 24 DB9 Ll P aa PET AC Source Battery Polarized ce Cable Assembly 0 0 8 AC DC Power Supply Power Module SDU 10 24 or SDU 20 24 Only 1 SDU 24 BATEM module can be connected in parallel with the power modules SDU 10 24 or SDU 20 24 Battery Module SDU 24 BATEM 7 6 Connections 1 Use the polarized cable to connect the power module to the battery module 2 Connect the power module dc input connector to the 24 V dc input power source 3 Hardwire the load to the power module output terminal connector 7 7 Charge the Battery The UPS charges the battery whenever it is connected to 24 V dc input power For best results charge the battery for 4 hours during initial use SDU DC Series Instruction Manual 10 7 8 Turn ON the UPS Normal Mode To start the UPS press and hold the ON OFF TEST button until a short beep is heard This should take less than 3 seconds Immediately release the ON OFF TEST button the UPS is now ON and the green LED is continuously lit Depressing the ON OFF TEST button for 5 seconds will turn the UPS OFF 7 9 Turn ON the UPS Green Mode With the UPS OFF depress the ON OFF TEST button until 2 short beeps are heard
14. ls e SDU PMBRK Chassis mounting brackets to secure the UPS to the wall back of the panel or enclosure SDU DC Series Instruction Manual 7 7 0 Installation Instructions 7 1 Placement Install the power module and battery module in a protected area with adeguate airflow and free of excessive dust Do not operate the UPS outdoors 7 2 DIN Rail Mounting 4 ja t Click 1 Tilt the unit as illustrated above 2 Put the unit onto the DIN rail 3 Push the unit downward until it stops 4 Push at the lower front edge to lock Gently shake the unit to ensure that the retainer has locked 7 2 1 Removing the Unit from the DIN Rail AT Ai of 1 Push the button and swing the bottom up and out 7 3 Chassis Mounting Use the optional chassis mounting brackets SDU PMBRK Please refer to the installation instructions supplied with the chassis mounting brackets NOTE If you will be shipping the UPS already mounted we recommend using the chassis mounting brackets SDU PMBRK to secure the UPS SDU DC Series Instruction Manual 8 7 4 SDU DC UPS with SDU 24 BAT Wiring Diagram lt RS232 DB9 AC Source ONL F DC Load Battery Polarized Cable Assembly D AC DC Power Supply 2 Power Module SDU 10 24 or SDU 20 24 Up to 4 SDU 24 BAT modules can be connected in parallel with the power modules SDU 10 24 or SDU 20 24 Battery Modu
15. ndustrial installation This equipment uses generates and can radiate radio frequency energy and if not installed and used in accordance with the instruc tions may cause harmful interference with radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment OFF and ON the user is encour aged to try to correct the interference by one or more of the following measures e Reorient or relocate the receiving antenna Increase the separation between the UPS and the receiver e Connect the UPS into a circuit different from that which the receiver is connected e Consult the dealer or an experienced radio TV technician for help SDU DC Series Instruction Manual 6 4 0 What s Included e SDU 10 24 or SDU 20 24 e Instruction manual 5 0 Battery Options Two battery modules are available SDU 24 BAT 24 V DIN rail panel mount battery module cable included NOTE Up to 4 SDU 24 BAT battery modules can be connected to the UPS e SDU 24 BATEM 24 V external mount battery module cable included NOTE Only 1 SDU 24 BATEM can be connected to the UPS A combination of both modules cannot be used with the UPS 6 0 Optional Accessories e SDU 24EXTBCE 6 ft battery module cable e SDU 24 DB9 Interface kit to convert relay contact signals to DB9 signa
16. r screws from the right and left sides of the enclosure 2 Remove eight screws from the top and bottom sides of the enclosure SDU DC Series Instruction Manual 16 3 Carefully slide the front cover forward and off the enclosure Do not disconnect the wires from the polarized terminals 4 Remove the wires from the battery posts 5 Remove the failed battery batteries Insert the new battery batteries 6 Use the following connection diagram to ensure a proper connection to the fuse protection board and polarized terminals Rg Rg I f Bat 1 Polarized terminal 1 Bati Bat2 Bat 2 Polarized terminal 2 R Red terminal B Black terminal Fuse 7 Slide the battery batteries into their respective positions SDU DC Series Instruction Manual 17 10 3 SDU 24 BAT Battery Replacement Instructions continued 8 Using four screws secure the protection fuse board 10 Secure the assembly with eight screws SDU DC Series Instruction Manual 18 10 4 SDU 24 BATEM Battery Replacement Instructions A CAUTION A CAUTION A CAUTION A CAUTION When removing and installing new batteries extreme care must be used not to short the metal chassis parts across the battery terminals and not to short the batteries to each ot
17. s connected to the computer interface port to avoid unnecessary draining of the battery 15 2 Extended Storage During extended storage in environments where the ambient temperature is 20 C to 30 C 5 F to 86 F charge the UPS battery every 6 months During extended storage in environments where the ambient temperature is 30 C to 45 C 86 F to 113 F charge the UPS battery every 3 months 16 0 Product Registration amp Warranty 16 1 Product Registration To register your product for updates and information on service and support e Visit the Technical Support section of our Web site at http www solahd com support registration htm e Click on the Product Registration link and fill in the form This will register your product with SolaHD 16 2 Warranty Information Please see Terms amp Conditions of Sale SDU DC Series Instruction Manual 27 SOLAD Technical Support U S 800 377 4384 International 847 268 6651 E mail www solahd com 4 EMERSON Industrial Automation Part Number A272 134 Rev 6 September 9 2008
18. sed EE gt Remote push button switch O O OUTPUTDC REMOTE 24V 35mA ON OFF SDU DC Series Instruction Manual 11 8 0 Operating Instructions M Ls TE 0000000000000 INPUT Ke 1 1 ON OFF TEST This button controls output power to the connected load s and has 4 functions 1 ON When the UPS is OFF press and release the ON OFF TEST button to start the UPS an audible alarm sounds briefly The UPS is capable of starting on battery cold start 2 OFF When the UPS is ON in either Normal or Battery Mode press the ON OFF Test button for 5 seconds to shut down the output dc power an audible alarm sounds briefly 3 TEST In the Normal Mode press the ON OFF TEST button for 1 second to initiate the self test function When the unit passes the test it will return to Normal Mode NOTE The self test function is disabled when the BATTERY FAULT LED is illuminated 4 Alarm Silence When an alarm is activated press and release the ON OFF TEST button to silence it whether input dc power is present or not Once the alarm is silenced all active alarms except for low battery overload or over temperature will remain silenced until a new alarm condition is detected SDU DC Series Instruction Manual 12 2 BATTERY FAULT Red LED The red LED illuminates when the UPS is expe riencing an overload condition The LED flashes when the battery is no longer useful or not connected
19. ules e Turn OFF the UPS and disconnect the dc supply before cleaning Do not use liquid or aerosol cleaners A dry cloth is recommended to remove dust from the surface of your UPS e Do not install or operate the UPS in or near water Do not place the UPS on an unstable cart stand or table e Do not place the UPS under direct sunlight or close to heat emitting sources e To allow proper ventilation of the UPS do not block or cover the top and bottom sides of the unit e Never block or insert any objects into the ventilation holes or other openings of the UPS Keep all vents free of dust accumulation that could restrict airflow SDU DC Series Instruction Manual 4 e Follow all warnings and instructions marked on the UPS Do not attempt to service the UPS as it has no user serviceable parts inside Refer all repairs to a qualified technician Do not dispose of batteries in a fire they may explode e Do not open or damage the batteries Released electrolyte is harmful to the skin and eyes and may be toxic If your UPS demonsirates any of the following conditions turn OFF the UPS disconnect the dc supply and contact your SolaHD representative or SolaHD Technical Support at 1 800 377 4384 e Liquid has been spilled on the UPS e The UPS does not operate in accordance with the instruction manual 1 2 Conditions of Use Your UPS provides conditioned power to connected equipment The maximum load must not exceed that sho
20. wn on UPS rating label If uncertain contact your SolaHD representative or SolaHD Technical Support at 1 800 377 4384 2 0 Warnings Defined AN DANGER Danger Indicates an imminently hazardous situation that if not avoided will result in death or serious injury This signal word is limited to the most extreme situations AWARNING Warning Indicates a potentially hazardous situation that if not avoided could result in death or serious injury A CAUTION Caution Indicates a potentially hazardous situation that if not avoided may result in minor or moderate injury It may also be used to alert against unsafe practices SDU DC Series Instruction Manual 5 3 0 Introduction Congratulations on your choice of the SDU DC Uninterruptible Power System UPS The SDU DC UPS is an advanced 24 V dc Uninterruptible Power System that combines an industry leading design with a wide operational temperature range and unique installation options The SDU DC UPS is a powerful microprocessor controlled UPS which provides protection from power interruptions With an input voltage range of 22 5 to 30 V dc the SDU DC UPS is the ideal power backup solution for your critical connected loads NOTE This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in an i
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