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Best Power Unity I Three Phase Installation Manual

1. Good ground connections are necessary to reduce electrical noise and make the operation of the UPS and the loads safe Follow the grounding guidelines in the installation wiring diagram Refer to the National Electrical Code NEC appropriate IEEE documents and all applicable codes For systems with non linear loads standard practice is to size the neutral conductor for 1 732 times the phase current When installing the AC wiring refer to Figure 7 8 or 9 and to any additional diagrams provided with the UPS Figures 7 8 and 9 show typical installations Your installation may differ e See Figure 3 5 for a view of the UPS with covers removed See Figure 4 or 6 for UPS wiring terminations See Figure 10 for information on the external connection board See Figure 11 for information on the optional communication interface board See Figure 12 for information on the optional relay board Ifyou have any questions contact BEST s Technical Support Center for assistance 12 UT310 UT315 UT320 and UT330 Planning and Installation Manual Figure 3 UT310 UT315 Front View Covers Removed FAN MONITOR BOARD COOLING FANS DC FUSE HOLDER 2001 5003 __ N AC OUTPUT FUSE HOLDER DISPLAY F007 F009 ON AND OFF d BUTTONS CONTROLLER BOARD 7 EXTERNAL CONNECTION BOARD COMMUNICATION INTERFACE BOARD MAINS BOARD PARALLEL BOARD EXTERNAL BATT
2. f you do not have BEST supplied maintenance bypass cabinet MBC you must provide a UPS input AC disconnect means You must also provide UPS input and output overcurrent protection e The maintenance bypass switch must be a 4 pole device which switches all three phases and neutral If you are using a 3 pole device contact BEST s Technical Support Center for instructions to convert the unit to a not separately derived system UT310 UT315 UT320 and UT330 Planning and Installation Manual Figure 10 External Connection Board Use Class 1 wiring methods NOT USED 1 X001 5 NOT USED X005 NOT USED 3 1 NOT USED 4 X006 xo02 NOT USED 3 SUMMARY ALARM IF 1 3 CONNECTED 2 BATTERY OPERATION 1 30 SECS DELAY 1 3 CONNECTED IF IN BATTERY OPERATION 3 EXTERNAL BYPASS CONTACT 1 3 CONNECTED IF SYSTEM IS IN STATIC BYPASS OPERATION 1 NOT USED X010 3 MBC INHIBIT IF SYSTEM OUTPUT IS OUTSIDE LIMITS 2 X011 THEN 1 3 ARE CONECTED NOT USED POSITION INDICATOR OF DCD IN OPTIONAL BATT CABINET 3 A JUMPER MUST BE USED IF THE UNIT HAS INTERNAL BATTERIES 110 4 X003 TO CONTROLLER BROWN 5 BATTERY TEMPERATURE COMPENSATION PR
3. Amps UL rating of terminal blocks AWG 10 0 10 0 10 0 10 0 Mains tolerance programmable 10 15 10 15 10 15 10 15 Bypass tolerance programmable 10 10 10 10 Frequency Hz 60 6 60 6 60 6 60 6 Current distortion THD 0 5 0 5 0 5 0 5 Notes for Table 6 1 For UPS module only UPS input breaker For units with external bypass see Figures 8 and 9 2 Conductor size may vary based on installation requirements Size all conductors per applicable codes 3 For a 100 non linear load recommended practice is to size the neutral conductor for 1 732 times the phase current UT310 UT315 UT320 and UT330 Planning and Installation Manual Table 7 UT320 UT330 AC Output Specifications UT320 UT330 Voltage 3 x 208Y 120 3 x 480Y 277 3 x 208Y 120 3 x 480Y 277 Rated output current Amps 56 24 83 36 Recommended overcurrent 70 30 125 45 protection Amps L1 L2 L3 10 L1 L2 L3 14 L1 L2 L3 10 L1 L2 L3 14 0 4 0 4 Neutral 4 00 Neutral 4 00 Neutral 4 00 Neutral 4 00 UL rating of terminal blocks AWG Tolerance 96 symmetrical load 1 1 1 1 asymmetrical load 3 3 3 3 load step 0 100 5 5 5 5 Distortion linear load 0 3 0 3 0 3 0 3 Frequency Hz mains synchronized 60 6 60 6 60 6 60 6 free running 60 0 1 60 0 1 60 0 1 60 0 1 Overload capacity 96 mains operation 1 minute 25
4. UT310 UT330 UPS GND pen DD M ME rM ES E mI M EIDEM s eese n 1 216V EXT 4 Lech BATTERY da M SUPPLY qp ccm po er E dec Id c3 EPO SHUNT TRIP 1 i TB SEE NOTE 2 10 NOTE 1 Size the mains input overcurrent protection device per applicable codes See the table below for mains input voltage and current ratings Mains Input UPS Model VAC Maximum Amps 208 50 UT310 480 22 208 76 UT315 480 32 208 100 UT320 480 43 208 149 UT330 480 65 NOTE 2 a Refer to any instructions provided with the DC disconnect DCD and pre charge discharge box b The pre charge discharge box must be located less than 10 feet 3048 mm from the DC disconnect 17 c LI ADDITIONAL NOTES A qualified electrician must install the UPS according to all applicable codes Power and control wires must be in separate conduits e The grounding electrode conductor protective earth PE must be the same size ampacity as the UPS input circuit conductors Conduit is not an acceptable grounding electrode conductor see National Electrical Code Section 250 91 a e The unit is wired from the factory as a separately derived system Output neutral is bonded to equipment ground through main bonding jumper inside the UPS See National Electrical Code Article 250 5 d and 250 26 for proper installation grounding
5. Battery Specifications 7 UT320 11 338 General Pe ox 8 UTD UT330 Weight Specifications cua X RR 8 UT310 UT315 Footprint with Conduit Connection Kit Top View 2 UT320 UT330 Footprint with Conduit Connection Kit Top View 3 UT310 UT315 Front View Covers Removed 13 UTS UT315 Wittig Terminations 13 UT320 UT330 Front View Covers Removed 14 Wirme Terminations osea REI neue REDE 14 UT310 UT330 Installation Wiring Diagram Typical Installation without External Maintenance Bypass Cabinet with Internal Batteries 15 UT310 UT330 Installation Wiring Diagram Typical Installation with Internal Batteries and Maintenance Bypass Cabinet 16 UT310 UT330 Installation Wiring Diagram Typical Installation with External Batteries and Maintenance Bypass Cabinet 17 External Connection CERA Y ERAG epe 18 Communication Interface Board Option 19 Relay DO eases o rai qu die soe 20 dsl 03 00 AP 26 ii UT310 UT315 UT320 and UT330 Planning and Installation Manual Section 100 Introduction An uninterruptible power system UPS protects sensitive equipment against unacceptable disturbances from the mains
6. MBC p p gt Make sure that the following switches are in the following positions The UPS AC disconnect switch should be OFF The UPS bypass switch should be on LINE e The DC disconnect DCD should be OFF Switch the UPS AC disconnect switch ON The UPS display should show System type xxkVA xxxV and an audible alarm should sound Within 20 seconds the UPS display should show Stand by If the unit has external batteries a Turn the pre charge discharge switch to the pre charge position and hold it until the LED turns off b Switch the DC disconnect DCD ON Press the green button located inside the front door of the UPS The UPS display should show Normal operation load power xx UT310 UT315 UT320 and UT330 Planning and Installation Manual 6 Ifthe unit has internal batteries put the DC fuses F001 F002 F003 into the DC fuse holder For instructions see Section 300 steps 11 14 7 Program the unit into static bypass operation a Press m to access the user parameters b Press the e Or key until the display shows Bypass operation OFF Press to turn static bypass operation on The display should show Bypass operation 8 Switch the UPS bypass switch to UPS 9 Program the unit to normal operation a Press m to access the user parameters b Press the a or key until the display shows Bypass opera
7. and battery temperature F C T1 25 77 25 Audible noise typical dBa 55 55 UPS dimensions with conduit connection kit 59 1 x 23 5 x 31 5 59 1 x 23 5 x 31 5 x W xD inches mm 1500 x 600 x 800 1500 x 600 x 800 UT310 UT315 UT320 and UT330 Planning and Installation Manual Table 5 UT310 UT315 Weight Specifications UT310 UT315 UPS weight without batteries with conduit 749 340 901 409 connection kit Ibs kg Floor loading UPS without batteries with 5 69 39 22 6 84 47 18 conduit connection kit Ibs in kPa Internal battery runtime at 0 8 PF minutes 16 30 9 16 UPS weight with internal batteries and 1111 504 1331 604 1237 561 1464 664 conduit connection kit Ibs kg Floor loading UPS with internal batteries 8 44 58 17 10 11 69 69 9 39 64 77 11 12 76 65 and conduit connection kit Ibs in kPa Notes for Table 5 1 For units with internal batteries unit weights and runtimes vary depending upon the battery pack ordered Runtimes are based on standard internal battery packs 103 Tables 6 10 contain specifications for UPS models UT320 and UT330 Specifications for the UT320 and UT330 Table 6 UT320 UT330 AC Input Specifications UT320 UT330 Voltage 3 x 208Y 120 3 x 480Y 277 3 x 208Y 120 3 x 480Y 277 Rated input current Amps 73 32 111 48 Recommended overcurrent protection 100 40 150 60
8. maintenance bypass cabinet MBC 1 Ifyou have shut the loads down Skip to step 3 If the loads are to remain powered Program the unit into static bypass operation a Press H to access the user parameters b Press the ie or 9 key until the display shows Bypass operation OFF c Press J to turn static bypass operation on The display should show Bypass Operation 2 Switch the UPS bypass switch to BYPASS 3 Press the red off button located inside the UPS front door 4 Switch the UPS AC disconnect switch OFF 5 If the UPS has external batteries a Switch the DC disconnect DCD b Hold the pre charge discharge switch in the discharge position until the LED turns off 30 6 UT310 UT315 UT320 and UT330 Planning and Installation Manual If the UPS has internal batteries a Open the DC fuse holder and remove the DC fuses F001 F002 F003 Store the fuses in a safe place b Open the UPS front door and press the green button to discharge the capacitors To restart the unit see Section 600 Startup from Maintenance Bypass 7 Optional If the loads are not to be powered turn off all AC power sources to the UPS and maintenance bypass cabinet MBC Section 600 Startup from Maintenance Bypass This section tells how to start the UPS from maintenance bypass The steps in this procedure are for a unit with a BEST supplied maintenance bypass cabinet
9. make sure the UPS output voltage and the AC line input voltage are in phase To do this measure the AC voltages between the following points at the MBC AC line input and the MBC output MBC AC Line Input MBC Output a Llinput to Ll output VAC b L2input to L2 output VAC c L3input to L3 output VAC These readings must not be more than 10 VAC If they are call BEST s Technical Support Center or your local BEST office At the maintenance bypass cabinet MBC measure the following a Ninputto Ground VAC b Noutput to Ground VAC c Ninputto N output VAC N input to N output should not exceed N input to Ground If it does call BEST s Technical Support Center Check for proper voltages at the bypass switch load output terminals and the load distribution panel s Bypass Switch Load Output Load Panel Input a Llto neutral VAC L1 to neutral VAC L2to neutral VAC L2 to neutral VAC c L3to neutral VAC L3 to neutral VAC Switch the UPS bypass switch to BYPASS Recheck for proper voltages at the bypass switch load output and the load distribution panel s Bypass Switch Load Output Load Panel Input a LI to neutral VAC L1 to neutral VAC L2to neutral VAC L2 to neutral VAC c L3to neutral VAC L3 to neutral VAC Switch the UPS bypass switch to UPS 28 UT310 UT315 UT320 and UT330 Planning and Installation Manual 25 Return the UPS to normal operation mode a Press to access the user parameters b Pre
10. or personal injury always assume that there may be voltage at the UPS output TEST BEFORE TOUCHING To reduce the risk of fire or electric shock install the UPS and external batteries in a temperature and humidity controlled indoor area free of conductive contaminants UPS batteries are high current sources Shorting battery terminals or DC terminal strips can cause severe arcing equipment damage and injury A short circuit can cause a battery to explode Always wear protective clothing and eye protection and use insulated tools when working near batteries asp This unit contains components that are sensitive to electrostatic discharge ESD NY If you do not follow proper ESD procedures you may cause severe damage to electronic components UT310 UT315 UT320 and UT330 Planning and Installation Manual Table of Contents List of Tables and PIEUIGS ioa o A ii 100 EE PE e p o ede Hd 1 IBI UPS 2 HE Ka Eb Rep T E RE Sans 2 102 Specifications for the UT310 and UT31S 103 Sp cifications Tor the DT320 and UT330 6 104 Receiving ang Moving tbe UPS VERE ERG OG Ue dE RENE E 9 105 Storing the UPS and Bavicnes 10 106 Finding a Location for the UPS 10 1037 Technical SBDDODD soin tcc E
11. service panel and the unit The unit will not start if the phase rotation is incorrect The phase rotation must be A B C and clockwise When the audible alarm stops push the green button located inside the UPS front door The display will show Normal operation load power NOTE One or more alarms may occur If the alarm s persists for more than 20 seconds refer to the Alarms section of the user manual If the unit activates a battery monitor alarm you should set the user parameter battery monitor reset to ON Open DC fuse holder F001 F002 F003 See Figure 13 For location of DC fuse holder see Figure 3 or 5 Place the DC fuses in the fuse holder Make sure that the red tab on the fuse faces the top of the fuse holder Make sure that the fuse locking tabs are aligned in the slots on the fuse holder See Figure 13 Press each fuse into place The fuse will click into place when it is locked in correctly Figure 13 DC Fuse Holder RED 26 UT310 UT315 UT320 and UT330 Planning and Installation Manual 14 Using an open palm close the fuse holder 15 If the unit has external batteries a Turn pre charge discharge switch to the pre charge position and hold it until the LED turns off b Switch the battery DC disconnect DCD ON 16 If the UPS is connected to a generator verify that the unit operates properly on generator power before continuing If th
12. terminal blocks AWG 10 0 14 4 10 0 14 4 Mains tolerance programmable 10 15 10 15 10 15 10 15 Bypass tolerance programmable 10 10 10 10 Frequency Hz 60 6 60 6 60 6 60 6 Current distortion THD 0 5 0 5 0 5 0 5 Table 2 UT310 UT315 AC Output Specifications UT310 UT315 Voltage 3 x 208Y 120 480Y 277 3 x 208Y 120 480Y 277 Rated output current Amps 28 12 42 18 Recommended overcurrent protection 35 15 60 25 Amps UL rating of terminal blocks AWG 10 0 14 4 10 0 14 4 Tolerance symmetrical load 1 1 1 asymmetrical load 3 3 3 3 load step 0 100 5 5 5 5 Distortion linear load 0 3 0 3 0 3 0 3 Frequency Hz mains synchronized 60 6 60 6 60 6 60 6 free running 60 0 1 60 0 1 60 0 1 60 0 1 Overload capacity 96 mains operation 1 minute 250 250 250 250 mains operation 10 minutes 150 150 150 150 battery operation 1 minute 150 150 150 150 battery operation 10 minutes 125 125 125 125 Notes for Tables 1 and 2 1 For UPS module only UPS input breaker For units with external bypass see Figures 8 and 9 2 Conductor size may vary based on installation requirements Size all conductors per applicable codes 3 For a 10046 non linear load recommended practice is to size the neutral conductor for 1 732 times the phase current 4 10046 imbalance provided output current rating is not exceeded UT310 UT315 UT320 and UT330 Planning and Install
13. the factory for autostart If programmed for autostart the unit will turn on any time mains AC line is applied after a 60 second delay For more information or to change this feature see the user manual Before continuing read the warnings on the inside front cover of this manual After installing the unit use this section to perform the initial startup and the phase check for the maintenance bypass cabinet MBC This section is for the initial startup only The steps in this section are for a unit with a BEST supplied maintenance bypass cabinet MBC Follow this Procedure Exactly No Load Should Be Connected 1 Make sure that all AC and DC power is off 2 Switch the UPS bypass switch to UPS 3 Make sure that the main circuit breaker in the load panel is off so that the loads cannot receive power from the UPS 25 10 11 12 13 UT310 UT315 UT320 and UT330 Planning and Installation Manual Open the UPS front door s Remove the retaining brackets for the fuse holder containing DC fuses F001 F002 and F003 See Figure 3 or 5 in Section 201 for location of fuse holder At the mains AC input panel switch on the input power to the UPS and maintenance bypass cabinet MBC Switch the UPS AC disconnect switch ON The UPS display should show System type xxkVA xxxV and an audible alarm should sound Within 20 seconds the display should show Stand by Check the phase rotation at the
14. voltage and ampere hour rating as the original batteries Verify that the Battery Terminal is Not Grounded If any battery terminal is inadvertently grounded you must remove the connection from the terminal to ground earth before you service the batteries Contacting any part of a grounded battery can cause a risk of electric shock An electric shock will be less likely if you disconnect the ground connection before you service the batteries Handle Used Batteries with Care Assume that old batteries are fully charged Use the same precautions you would use when handling a new battery Do not short battery terminals or the battery string with a cable or tool when you disconnect the batteries 24 UT310 UT315 UT320 and UT330 Planning and Installation Manual e Dispose of Batteries Properly For assistance call BEST s Technical Support Center at 1 800 356 5737 U S A or Canada or call your local BEST office WARNING Do not dispose of batteries in a fire because the batteries could explode Do not open or mutilate batteries Released electrolyte is harmful to the skin and eyes and may be toxic Batteries contain lead Many state and local governments have regulations about disposing of used batteries Dispose of batteries properly For assistance call BEST s Technical Support at 1 800 356 5737 or call your local BEST office Section 300 Initial Startup and Phase Check WARNING Some units have been programmed at
15. 0 250 250 250 mains operation 10 min 150 150 150 150 battery operation 1 150 150 150 150 minute 125 125 125 125 battery operation 10 min Notes for Table 7 1 Conductor size may vary based on installation requirements Size all conductors per applicable codes 2 For a 100 non linear load recommended practice is to size the neutral conductor for 1 732 times the phase current 3 100 imbalance provided output current rating is not exceeded Table 8 UT320 UT330 DC Input Battery Specifications UT320 UT330 Nominal DC current Amps 100 150 UL rating of terminal blocks 14 00 14 00 AWG Nominal voltage 216 216 Nominal number of cells 108 108 Factory set float charge voltage 246 246 Charger current limit Amps 10 15 Inverter efficiency 10096 load 90 91 75 load 90 91 50 load 88 89 25 load 85 86 Notes for Table 8 1 Terminal block has two positive and two negative 8 mm 5 16 studs hardware provided Lug required Conductor size may vary based on installation requirements Size conductors per applicable codes 2 Adjust the float charge voltage setting per the battery manufacturer s recommendations 3 Programmable to lower level 7 UT310 UT315 UT320 and UT330 Planning and Installation Manual Table 9 UT320 UT330 General Specifications UT320 UT330 Noise attenuation dB differential mode 60 60 common mode 120 120 Typic
16. 5 10 1 For units with internal batteries unit weights and runtimes vary depending upon the battery pack ordered Runtimes are based on standard internal battery packs UT310 UT315 UT320 and UT330 Planning and Installation Manual 104 Receiving and Moving the UPS WARNING The UPS and related equipment are very heavy To prevent personal injury or equipment damage use extreme care when handling and transporting the UPS cabinet and related equipment 1 While the UPS system is still on the truck inspect the equipment and shipping container s for any signs of damage Do not install the system if damage is apparent If damage has occurred notify BEST as soon as possible 2 Compare the shipment with the bill of lading Report any missing items to the carrier and to BEST immediately 3 Remove the screws on the bottom part of the packaging side plates 4 Lift the main package up and off the unit and remove the packing materials from the unit 5 Check that the label inside the front door corresponds to the system ordered especially the input output voltages 6 Unbolt the unit from the pallet 7 Remove the unit from the pallet with a fork lift 8 Use a fork lift or hand truck to transport the unit to the installation site or storage site Study the footprint to decide how you will move the UPS through doorways and into position 9 Install the separately shipped conduit connection kit See the conduit con
17. AC line supply The UNITY I three phase UPS has the capacity to serve a wide variety of electrical equipment from mainframe computers to enterprise wide EDP installations to production lines The UNITY I three phase UPS provides true on line single conversion technology and harmonics isolation Only a qualified electrician should install this unit The planning and installation manual gives the electrician guidelines for installation wiring external battery installation UPS startup procedures phase check for the maintenance bypass cabinet UPS shutdown procedures If you need assistance please have the UPS model number and serial number available and call BEST s Technical Support Center at 1 800 356 5737 U S A or Canada or call your local BEST office UT310 UT315 UT320 and UT330 Planning and Installation Manual 101 UPS Footprints See Figure 1 for a footprint of UPS model UT310 or UT315 See Figure 2 for a footprint of UPS model UT320 or UT330 Figure 1 UT310 UT315 Footprint with Conduit Connection Kit Top View Inches Millimeter A gt 23 6 600 lt 20 1 510 2 4 60 D 19 8 504 E 27 9 708 i F 31 7 804 For service clearance and air flow allow a minimum of 3 feet 914 mm CONDUIT at the front 3 feet 914 mm at the top and 6 inches 152 mm at the back Cable entry from bottom only Conduit connec
18. ERY CONNECTION GROUNDING N ELECTRODE EN INPUT OUTPUT SS TERMINAL TERMINAL BLOCKS OPTIONAL EQUIPMENT Figure 4 UT310 UT315 Wiring Terminations BATTERY X003 7 1 2 2 ij t 1 BATTERY X003 GROUNDING TERMINALS MAINS INPUT X001 1 2 3 4 L1 L2 L3 N NOTE Ground and battery studs are 8 mm 5 16 AC OUTPUT X004 in diameter 8 mm hardware is provided Lug 1 2 3 4 required L1 L2 L3 N 13 UT310 UT315 UT320 and UT330 Planning and Installation Manual Figure 5 UT320 UT330 Front View Covers Removed COOLING FANS PARALLEL BOARD QNAND OE FAN MONITOR N BOARD CONTROLLER BOARD AC OUTPUT dd FUSE HOLDER wi 007 2009 DC FUSE HOLDER F001 F003 lL 4 COMMUNICATION INTERFACE s EXTERNAL BOARD BATTERY CONNECTION GROUNDING ELECTRODE Jt y OPTIONAL EQUIPMENT TERMINAL SEEN AT BLOCKS Figure 6 UT320 UT330 Wiring Terminations MAINS INPUT X001 j 1 2 34 AC OUTPUT X004 1 2 34 L1 L2 L3 N BATTERY X003 1 2 29 GROUNDING TERMINALS NOTE Ground and battery studs are 8 mm 5 16 in diameter 8 mm hardware is provided Lug required UT310 UT315 UT320 and UT330 Planning and Installation Manual Figure 7 UT310 UT330 Installation Wiring Diagram Typical Installation without
19. External Maintenance Bypass Cabinet with Internal Batteries MAINS INPUT 3 PHASE 4 WIRE amp GROUND A B C CLOCKWISE ROTATION SEE NOTES 1 3 a WARNING UNIT WILL NOT OPERATE IF PHASE ROTATION IS INCORRECT g 4 MAIN STATIC SWITCH NOTE 1 a For a UT310 or UT315 see Table 1 in Section 102 for recommended UPS input overcurrent protection b For a UT320 or UT330 see Table 6 in Section 103 for recommended UPS input overcurrent protection NOTE 2 a For a UT310 or UT315 see Table 2 in Section 102 for recommended UPS output overcurrent protection b For a UT320 or UT330 see Table 7 in Section 103 for recommended UPS output overcurrent protection NOTE 3 You must provide overcurrent protection and UPS input AC disconnect means 15 TRANSFORMER UT310 UT330 UPS OUTPUT TO 3 PHASE LOADS 2286 4 WIRE amp GROUND A B C CLOCKWISE ROTATION gt SEE NOTES 2 3 1 I Eea 11 amp 3 7 8 X009 l EXTERNAL CONN BOARD X003 G i LN LOCAL GROUND ELECTRODE CONDUCTOR MUST TERNI F2 INSTALLED ACCORDING TO BATTERIES 250 26 amp NEC 250 91 ANH GND i ADDITIONAL NOTES A qualified electrician must install the UPS according to all appl
20. OBE BLUE BOARD POSITION INDICATOR OF EXTERNAL UPS BYPASS SWITCH d gt X012 NOT USED n 11 REMOTE START STOP 13 COMMON 11 12 OFF CLOSING CONTACTS d dbi EMERGENCY SHUT DOWN IF 12VDC 10mA EXTERNAL SUPPLY iy IS REMOVED FROM TERMINALS TO USE THIS FUNCTION REMOVE JUMPER SWO1 m 15 16 o EMERGENCY SHUT DOWN IF DISCONNECTED 12V CIRCUIT m 6 X004 5 NOT USED X007 X011 ARE CHANGE OVER RELAY CONTACTS NOT TO EXCEED ART 725 CLASS 2 LIMITS 18 UT310 UT315 UT320 and UT330 Planning and Installation Manual Figure 11 Communication Interface Board Option Use Class 1 wiring methods Not rs To Controller X002 X001 X003 25 PIN SUB D MALE COMMUNICATION X004 25 PIN SUB D MALE INTERFACE BOARD X005 25 PIN SUB D FEMALE X005 X004 X003 Serial Port RS232 Serial Port 0 20 mA current loop COM PORT RELAY CONTACTS 30 VAC 60 VDC Maximum 0 5 A Minimum 0 05 mA ps 14 et 15 UPS on shown with UPS off 2 16 17 Static bypass operation shown with static bypass operation off 4 D 6077 19 Battery operation shown with battery operation off 6 2 20 mo e 21 Battery low warning shown with battery low warning off 8 ty Y 13 Remote UPS shut down input 3 5 25 VDC pulse for 1 second minimum 25 19 UT310 UT315 UT320 and UT330 Planning and Installation Manual Figur
21. RES inre ea kuer ee bu eet d 11 200 Installalitli Eb E doc o eec eR C ox OUO Ha ed d 11 201 Installing the Maintenance Bypass Cabinet MBC and UPS 12 202 Installing the External Batteries and DC Disconnect DCD 21 300 Initial Startup and Phase Check ceo eh y GU be REA 25 400 Clearine the Events Log 29 500 Shutdown PIOBBOUIS 2a ARE QS RE da 30 600 Startup from Maintenance Bypass 31 700 Glossary of Terms and 32 70L Glossary ERE ESO HO 32 702 Abbreviations T EHE HER HR Hoa eed d 33 UT310 UT315 UT320 and UT330 Planning and Installation Manual List of Tables and Figures Tables _ NWN Figures 10 11 12 13 UT310 UT315 AC HON 4 UT310 UT315 AL Output Specifications 4 UT310 UT3IS DC Iuput Battery Specifications 5 UT310 UT315 General Specifications ioi REX 5 6 LUT320 HT330 AL Input 6 UT320 01339 AC Output Specifications 4 3 5 7 UT320 UT330 DC Input
22. UNITY I Three Phase Uninterruptible Power Systems UT310 UT315 UT320 UT330 60 Hz Planning and Installation Manual le LTS 0371D Copyright 1995 Best Power Technology Incorporated UL ABEST UT310 UT315 UT320 and UT330 Planning and Installation Manual IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS This manual contains important instructions for the UNITY I three phase UPS The installation and use of this product must comply with all national federal state municipal or local codes that apply If you need help please call BEST s Technical Support Center at 1 800 356 5737 U S A or Canada elsewhere call your local BEST office Q WARNING UPS units contain hazardous AC and DC voltages A qualified electrician must install the UPS AC line service and external batteries according to local and national codes and must be familiar with batteries and battery installation Before installing maintaining or servicing the UPS shut off the UPS and disconnect all sources of AC and DC power Whenever AC and or DC voltage is applied there may be AC voltage at the UPS output this is true because the UPS can supply output power from mains or from its batteries To avoid equipment damage
23. al heat dissipation kW BTU full rated load normal operation 1 28 4357 1 91 6536 full rated load economy mode 0 83 2844 1 25 4266 0 8 PF load normal operation 1 02 3486 1 53 5228 0 8 PF load economy mode 0 67 2275 1 00 3413 Efficiency AC to AC normal operation 94 94 economy mode 96 96 Air flow m hour 294 5 500 294 5 500 Humidity non condensing maximum 95 95 Ambient UPS and battery temperature F C 32 104 0 40 32 104 0 40 Ideal UPS and battery temperature F C 77 25 77 25 Audible noise typical dBa 55 55 UPS dimensions with conduit connection kit x W x D inches mm 59 1 x 39 4 x 31 5 1500 x 1000 x 800 59 1 x 39 4 x 31 5 1500 x 1000 x 800 Table 10 UT320 UT330 Weight Specifications Notes for Table 10 UT320 UT330 UPS weight without batteries with conduit connection 1176 533 1330 603 kit Ibs kg Floor loading UPS without batteries with conduit 5 95 41 05 6 73 46 42 connection kit Ibs sq in kPa Internal battery runtime at 0 8 PF minutes 12 16 30 9 16 UPS weight with internal batteries and conduit 1748 1882 2317 2112 2438 connection kit Ibs kg 793 854 1051 958 1106 Floor loading UPS with conduit connection kit and 8 85 9 53 11 73 10 69 12 34 internal batteries Ibs in kPa 61 02 65 69 80 88 73 72 8
24. at the front and 3 feet 914 mm at the top of the unit If possible allow 3 feet 914 mm of clearance around the entire unit for easier installation and servicing All service access is from the front and top of the unit cable entry is from the bottom of the unit Do not operate the UPS or batteries in a sealed room or container 10 UT310 UT315 UT320 and UT330 Planning and Installation Manual 107 Technical Support Best Power Technology Incorporated is committed to outstanding customer service Our Technical Support Center is happy to help you with any problems or answer any questions you may have A service technician is available 24 hours a day 365 days a year Please have the UPS model number and serial number available when you call The numbers are on the ID label located inside the front door Technical Support 1 800 356 5737 U S A and Canada or 1 608 565 2100 Technical Support Fax 1 608 565 7642 or 1 608 565 2509 Bulletin Board Service 1 608 565 7424 CompusServ Type Go BEST at any prompt Section 200 Installation WARNING Before continuing read the warnings on the inside front cover of this manual The installation instructions in this section are for a UPS with a BEST maintenance bypass cabinet MBC Insulated Tools and Other Equipment Needed Torque wrench in inch pounds or e Electrical tape newton meters e Standard and Phillips screwdrivers e Standard U S and met
25. ation Manual Table 3 UT310 UT315 DC Input Battery Specifications UT310 UT315 Nominal DC current Amps 50 75 UL rating of terminal blocks AWG 14 00 14 00 Nominal DC voltage 216 216 Nominal number of cells 108 108 Factory set float charge voltage 246 246 Charger current limit Amps 6 8 Inverter efficiency 100 load 89 90 75 load 89 90 50 load 87 88 25 load 84 85 Notes for Table 3 1 Terminal block has two positive and two negative 8 mm 5 16 studs hardware provided Lug required Conductor size may vary based on installation requirements Size all conductors per applicable codes 2 Adjust the float charge voltage setting per the battery manufacturer s recommendations 3 Programmable to lower level Table 4 UT310 UT315 General Specifications UT310 UT315 Noise attenuation dB differential mode 60 60 common mode 120 120 Typical heat dissipation kW BTU full rated load normal operation 0 75 2569 1 13 3853 full rated load economy mode 0 53 1796 0 79 2694 0 8 PF load normal operation 0 60 2055 0 90 3083 0 8 PF load economy mode 0 42 1437 0 63 2156 Efficiency AC to AC normal operation 93 93 economy mode 95 95 Air flow m hour 294 5 500 294 5 500 Humidity non condensing maximum 95 95 Ambient UPS and battery temperature F 32 104 0 40 32 104 0 40 Ideal UPS
26. common mode The ability to attenuate noise line to ground and neutral to ground Nominal voltage The voltage at which a device operates under ideal conditions Power factor PF The ratio of the true real power to the apparent power root means square RMS voltage times RMS current of an alternating current circuit Protective earth PE Synonymous with grounding electrode conductor Static switch An electronic switch that has no moving parts 702 Abbreviations BCA Battery cabinet assembly DCD DC disconnect switch may be a separate switch or a switch located on the battery cabinet rack MBB Maintenance bypass breaker MBC Maintenance bypass cabinet MIB Main input breaker MOB Main output breaker SKRU Solenoid key release unit UIB UPS input breaker UOB UPS output breaker Best Power Technology Incorporated reserves the right to change specifications without prior notice 33
27. e 12 Relay Board Option Not available on the UT310 and UT315 The relays are shown in the alarm position and correspond to non energized coils RELAY BOARD xo02 1 MAINS FAILURE BATTERY CHARGING FAILURE OVERLOAD FAN FAILURE INVERTER FUSE FAILURE LOW BATT VOLTAGE HIGH TEMPERATURE BATTERY DCD OFF OUTPUT VOLTAGE OUTSIDE LIMITS UPS ON STATIC BYPASS EXTERNAL MANUAL BYPASS ON NORMAL OPERATION COMMON FAULT BYPASS VOLTAGE OUTSIDE LIMITS BATTERY OPERATION NOT USED Description Minimum Maximum Contact voltage AC 6V 250 V Contact current 50 mA 8A Contact voltage and 6V 50mA 250V 0 3A current DC 6V 8A Resistive load 20 UT310 UT315 UT320 and UT330 Planning and Installation Manual 202 Installing the External Batteries and DC Disconnect DCD Some units have optional external batteries in a separate cabinet or rack External batteries must be installed and connected to the UPS by a qualified service person who is familiar with UPS battery installations and applicable building and electrical codes The qualified service person should read this entire section before the UPS and batteries arrive A DANGER Full voltage and current are always present at the battery terminals The batteries used in this system can produce dangerous voltages extremely h
28. e UPS operates properly on generator power continue this procedure If the UPS does not operate properly on generator power phone BEST s Technical Support Center for assistance CAUTION Before you switch the UPS bypass switch from UPS to LINE use the steps below to check for correct voltage phasing and system operating mode 17 Program the unit into static bypass operation a Press to access the user parameters b Press the Or key until the display shows Bypass operation OFF c Press L to turn static bypass operation on The display should show Bypass Operation 18 At the maintenance bypass cabinet MBC make sure the UPS output voltage is approximately the same as the AC line input voltage there may be slight differences Use a true RMS voltmeter to measure the phase to neutral voltage at the MBC AC line input and the MBC output MBC AC Line Input Output a Llto neutral VAC Ll to neutral VAC L2to neutral VAC L2toneutral VAC c L3to neutral VAC to neutral VAC The voltages in the first column should be similar to the voltages in the second column If the voltages are more than 10 volts apart for 208 V nominal or 25 volts apart for 480 V nominal check the connections and correct any wiring problems before continuing 27 19 20 21 22 23 24 UT310 UT315 UT320 and UT330 Planning and Installation Manual At the maintenance bypass cabinet MBC
29. icable codes All power and control wires must be in separate conduits e The grounding electrode conductor protective earth PE must be the same size ampacity as the UPS input circuit conductors Conduit is not an acceptable grounding electrode conductor see National Electrical Code Section 250 91 a e The unit is wired from the factory as a separately derived system Output neutral is bonded to equipment ground through main bonding jumper inside the UPS See National Electrical Code Article 250 5 d and 250 26 for proper installation grounding UT310 UT315 UT320 and UT330 Planning and Installation Manual Figure 8 UT310 UT330 Installation Wiring Diagram Typical Installation with Internal Batteries and Maintenance Bypass Cabinet i BYPASS MAINS INPUT 3 PHASE DISCONNECT SWITCH OUTPUT TO 3 PHASE LOADS 4 WIRE amp GROUND LINE fs WIRE GROUND A B C CLOCKWISE NOTE1 A B C CLOCKWISE ROTATION Li ROTATION ON e OFF UPS 120 amp 1 43 WARNING UNIT WILL NOT OPERATE le 1 IF PHASE ROTATION IS INCORRECT pommes tee eee 3 pM m 1 I2 13 L112 13 NGI 2 X004 6860 l 6 8 E 13 34 7 8 1 x 5 4 SAT an anm SWITC i
30. igh currents and a risk of electric shock They may cause severe injury if the terminals are shorted together or to ground earth You must be extremely careful to avoid electric shock and burns caused by contacting battery terminals or shorting terminals during battery installation Do not touch uninsulated battery terminals A qualified service person who is familiar with battery systems and required precautions must install and service the batteries The installation must conform to national and local codes Keep unauthorized personnel away from batteries The qualified service person must take these precautions 1 Wear protective clothing such as rubber gloves and boots and protective eye wear Batteries contain caustic acids and toxic materials and can rupture or leak if mistreated Remove rings and metal wristwatches or other metal objects and jewelry Do not carry metal objects in your pockets where the objects can fall into the battery cabinet Tools must have insulated handles and must be insulated so that they will not short battery terminals Do not allow a tool to short between individual or separate battery terminals or to the cabinet or rack Do not lay tools or metal parts on top of the batteries and do not lay them where they could fall onto the batteries or into the cabinet Install the batteries as shown on the drawing provided with the batteries When connecting cables never allow a cable to short across a battery s termina
31. l F007 F009 GND P E m 4 n GND INVERTER NS T CERES A Y NOTE 1 Size the mains input overcurrent protection device per applicable codes See the table below for mains input voltage and current ratings Mains Input UPS Model VAC Maximum Amps 208 50 UT310 480 22 208 76 UT315 480 32 208 100 UT320 480 43 208 149 UT330 480 65 16 LOCAL GROUND ELECTRODE CONDUCTOR MUST BE INSTALLED ACCORDING TO NEC 250 26 amp NEC 250 91 INTERNAL rn BATTERIES ADDITIONAL NOTES A qualified electrician must install the UPS according to all applicable codes e Power and control wires must be in separate conduits e The grounding electrode conductor protective earth PE must be the same size ampacity as the UPS input circuit conductors Conduit is not an acceptable grounding electrode conductor see National Electrical Code Section 250 91 a e The unit is wired from the factory as a separately derived system Output neutral is bonded to equipment ground through main bonding jumper inside the UPS See National Electrical Code Article 250 5 d and 250 26 for proper installation grounding f you do not have BEST supplied maintenance bypass cabinet MBC you must provide a UPS input AC disconnect means You must also provide UPS input and output overcurrent protection e The maintenance bypass switch mus
32. ls the string of batteries or to the cabinet or rack Align the cables on the battery terminals so that the cable lug will not contact any part of the cabinet or rack even if the battery is moved Keep the cable away from any sharp metal edges Install the battery cables so they cannot be pinched by the UPS or battery cabinet doors 21 UT310 UT315 UT320 and UT330 Planning and Installation Manual Do not connect the battery terminal to ground earth If any battery terminal is inadvertently grounded remove the source of the ground Contacting any part of a grounded battery can cause a risk of electric shock To reduce the risk of fire or electric shock install the batteries in a temperature and humidity controlled indoor area free of contaminants Battery system chassis ground earth must be connected to the UPS chassis ground earth If you use conduit this ground conductor must be routed in the same conduit as the battery conductors Where conductors may be exposed to physical damage protect the conductors in accordance with all applicable codes If you are replacing batteries or repairing battery connections shut off the UPS and remove both AC and DC power Follow these guidelines when installing the batteries Refer to any instructions provided with the batteries Refer to any instructions provided with the DC disconnect DCD and pre charge discharge switch External batteries
33. nection kit for installation instructions UT310 UT315 UT320 and UT330 Planning and Installation Manual 105 Storing the UPS and Batteries You can store the UNITY I UPS between 4 and 104 F 20 and 40 C However BEST recommends that the unit and batteries be stored between 59 and 77 F 15 and 25 C This temperature range or cooler allows batteries to have a longer shelf life Recharge stored batteries every 90 to 120 days 106 X Finding a Location for the UPS Keep these guidelines in mind when you choose the location for the UPS system and the batteries Place the UPS in a clean dust free air free of contaminants The air must be free to circulate around the UPS cabinet and any battery cabinets or racks Avoid placing the unit in direct sunlight or near other heat sources Make sure that the ambient temperature 15 32 to 104 F 0 to 40 C Ideal temperature is 77 F 25 C NOTE At95 F 35 battery life will be about one half what it would be at a normal temperature of 77 25 At 113 F 45 C battery life will be about one fourth normal e Make sure that the floor can support the weight of the UPS external batteries and any other necessary equipment See Tables 5 and 10 for floor loading specifications The unit can be placed close to walls as long as there is enough clearance for the front door s to open Required service clearance is 3 feet 914 mm
34. on Manual c Connect the positive cable s to the battery system and tighten to the proper torque specifications d Connect the negative cable s to the battery system and tighten to the proper torque specifications Check the DC voltage a Connect the DC fuse s as shown in the battery installation diagram provided with the batteries Verify proper voltage 216 VDC and polarity at the battery pack b Then turn the DC disconnect DCD ON c Meter for proper nominal DC voltage at the UPS end of the cables Make sure the polarity agrees with the markings on the UPS battery input terminals d After checking the DC voltage turn the DC disconnect DCD OFF Connect the negative cable s to the UPS Tighten to the proper torque specifications Replace all covers Continue with Section 300 Initial Startup and Phase Check Battery Replacement Information Only a qualified service person familiar with battery systems should replace batteries See Section 500 Shutdown Procedures to bypass and shut down the UPS Review all of the warnings at the beginning of Section 202 before replacing the batteries Use the Same Number and Type of Battery To ensure continued superior performance of your UPS and to maintain proper battery charger operation you must replace the batteries with the same number of batteries The batteries must be the same manufacturer type as the original batteries and have the same
35. or See Figure 4 or 5 for the location of the grounding electrode terminals in the UPS Connect the cables between batteries a Ihn each battery string connect the cables between batteries as shown in the battery installation diagram provided with the batteries b Meter the positive and negative terminal on each battery string to verify proper nominal voltage and polarity Connect the battery cables between battery strings a Connect the negative cables between battery strings as shown in the battery installation diagram provided with the batteries b Meter the DC voltage between the positive terminals of the strings The voltage should measure less than 5 volts If it measures greater than 5 volts correct any wiring errors before you continue c Connect the positive cables between battery strings as shown in the battery installation diagram provided with the batteries Install the DC disconnect DCD and pre charge discharge switch Refer to Figure 7 8 or 9 and to any instructions provided with the DCD and pre charge discharge switch Connect the external batteries to the UPS a Connect the positive cable s to the UPS first Install ring connectors for 8 mm 5 16 bolts as required b To prevent short circuits insulate the UPS end of the negative cable s Do not connect the negative cables to the UPS yet 23 9 10 UT310 UT315 UT320 and UT330 Planning and Installati
36. require a fused disconnect or a DC circuit breaker There should be a disconnecting means for each battery string The external battery fuse protects the battery cables Size the cables based on the overcurrent protection device The battery cables must be sized for a total maximum voltage drop of 2 0 VDC at the rated DC current Wherever conductors may be exposed to physical damage protect the conductors in accordance with any applicable codes This includes battery cables between the UPS and the battery system and cables between battery cabinets or racks BEST recommends routing battery cables through flexible conduit Install flexible conduit for battery cables according to local or national code The battery system ground earth must be connected to the UPS chassis ground earth This ground conductor must be routed with the battery cables 22 UT310 UT315 UT320 and UT330 Planning and Installation Manual Clean the cables and battery terminals before making the battery connections Apply a thin coating of conductive grease before making the battery connections or apply petroleum jelly to the entire connection after it has been made Torque battery connections to the battery manufacturer s specifications Follow the steps below and any instructions provided with the battery system 1 Verify that the DC fuses are removed from the UPS See Figure 3 5 for the location of the DC fuse holder Install the ground conduct
37. ric wrenches Torx head screwdriver set Petroleum jelly or conductive grease Brush for applying petroleum jelly e Mallet conductive grease to battery terminals e Volt Ohm meter True RMS Digital e UNITY I User Manual e Pliers e Phase rotation meter e Ratchet and sockets The customer must provide all cabling and interconnection hardware 11 UT310 UT315 UT320 and UT330 Planning and Installation Manual 201 Installing the Maintenance Bypass Cabinet MBC and UPS IMPORTANT If you do not have a BEST maintenance bypass cabinet MBC you must provide overcurrent protection and a UPS input AC disconnect means BEST strongly recommends that a means of bypassing the UPS from the critical load be provided for maintenance Follow these guidelines when installing the MBC and UPS Use the information in Section 106 to find an appropriate location for the UPS Install the conduit connection kit per the instructions provided with the conduit connection kit e Install the MBC within sight of the UPS When installing the MBC see Figure 8 or 9 and any instructions provided with the MBC Install all wiring in accordance with applicable electrical codes Use 75 C copper conductors Install the AC input and UPS output in separate conduits UPS output circuits shall be installed in dedicated conduit systems and not shared with other electrical circuits e Control wiring must be installed in separate conduit
38. ss the e Or key until the display shows Bypass operation ON Press to turn static bypass operation off The display should show Normal operation load power xx You can now apply loads to the system As the last step of the installation BEST recommends that you clear the events log See Section 400 Clearing the Events Log Section 400 Clearing the Events Log The events log contains the 250 most recent UPS events including alarms To clear the events log follow the steps below 1 Simultaneously press 2 e The display should show Key in password 2 Using the key pad enter 920701 The display should show Logging stack is reset The events log is now cleared 3 Press 2 the display should show Normal operation load power xx If the unit will not be used immediately go to Section 500 Shutdown Procedure 29 UT310 UT315 UT320 and UT330 Planning and Installation Manual Section 500 Shutdown Procedure a WARNING After shutting down the unit wait at least five minutes before removing any access panels or covers Access panels should be removed by qualified service personnel only After shutting down the UPS there may still be high voltage inside the unit TEST BEFORE TOUCHING Before continuing read the warnings on the inside front cover of this manual This section tells how to shut down the UPS from normal operation mode This procedure is for a unit with a BEST supplied
39. t be a 4 pole device which switches all three phases and neutral If you are using a 3 pole device contact BEST s Technical Support Center for instructions to convert the unit to a not separately derived system UT310 UT315 UT320 and UT330 Planning and Installation Manual Figure 9 UT310 UT330 Installation Wiring Diagram Typical Installation with External Batteries and Maintenance Bypass Cabinet BYPASS MAINS INPUT 3 PHASE SWITCH OUTPUT TO 3 PHASE LOADS 4 WIRE amp GROUND LINE WIRE amp GROUND A B C CLOCKWISE NOTE 1 1 i A B C CLOCKWISE ROTATION Pe ROTATION i OFF P no vl a i 1 ___ WARNINGI 4 E UNIT WILL NOT OPERATE i IEPHASEROTATIONIS INCORRECT Seta tapi i x001 1x004 f rg i L2 L3 N G 12 i 8 o o E Aen 13 34 7 8 2 34 X009 12 EXTERNAL CONN BOARD F007 F009 GND vue ANUS ar Ui i GND SWITCH H gt rl 4 TRANSFORMER ux Pc i LOCAL GROUND ELECTRODE PA CONDUCTOR MUST BE 2 TG FUSE F001 INSTALLED ACCORDING TO i 4 2 NEC 250 26 amp NEC 250 91 Eo INVERTER X003 i Tz a i LA I LY Hb i
40. tion ON c Press to turn static bypass operation off The display should show Normal operation load power xx Section 700 Glossary of Terms and Abbreviations See Section 701 for the glossary of terms See Section 702 for a list of abbreviations 701 Glossary of Terms Ampere Amp A unit of electric current equivalent to a steady current produced by one volt applied across a resistance of one ohm British thermal unit BTU A unit of heat energy equal to the heat needed to raise the temperature of one pound of air free water from 60 to 61 F at a constant pressure of one standard atmosphere Decibel adjusted dBa A unit used to show the relationship between an acoustic noise source and a reference sound power level of 85 dBm Ground Earth A conducting connection whether intentional or accidental by which an electric circuit or equipment is connected to earth or to some conducting body that serves in place of earth Load tolerance symmetrical Equally balanced loads on a three phase system 32 UT310 UT315 UT320 and UT330 Planning and Installation Manual Load tolerance asymmetrical Unbalanced loads on a three phase system Mains The conductors extending from the service switch generator bus or converter bus to the main distribution center in interior wiring Synonymous with power source Noise attenuation differential mode The ability to attenuate noise line to line Noise attenuation
41. tion kit includes one conduit connection box and two pedestals shipped separately CABLE ENTRY ALLOW FOR A MINIMUM OF 3 FEET OF SERVICE CLEARANCE IN FRONT AND ON TOP OF UNIT UT310 UT315 UT320 and UT330 Planning and Installation Manual Figure 2 UT320 UT330 Footprint with Conduit Connection Kit Top View A CONDUIT CONNECTION CABLE ENTRY ALLOW FOR A MINIMUM 3 FOOT SERVICE CLEARANCE IN FRONT OF UNIT aie Inches Millimeters A 39 4 1000 B 21 3 540 C 14 6 370 D 19 8 504 E 27 9 708 F 31 7 804 G 2 4 60 For service clearance and air flow allow a minimum of 3 feet 914 mm at the front 3 feet 914 mm at the top and 6 inches 152 mm at the back Cable entry from bottom only Conduit connection kit includes one conduit connection box and three pedestals shipped separately UT310 UT315 UT320 and UT330 Planning and Installation Manual 102 Tables 1 5 contain specifications for UPS models UT310 and UT315 Table 1 UT310 UT315 AC Input Specifications Specifications for the UT310 and UT315 UT310 UT315 Voltage 3 x 208Y 120 3 x 480Y 277 3 x 208Y 120 3 x 480Y 277 Rated input current Amps 37 16 55 24 Recommended overcurrent protection 50 20 70 30 Amps UL rating of

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