Benutzeranleitung / Produktwartung 30-130kVA des Produzenten Liebert
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AC P ow er For Bu siness-Critical Con tinuit y Npowe r ™ UPS Operat ion & M aintenance Ma nual– 30- 130 kV A, 60H z, Sing le Mo dule Sys tem.
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i T ABLE OF CONTENTS I MPORT AN T S AFETY I NSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 O VERVIEW O F M ANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii 3.4 Faults, Alarms, Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 3.4.1 Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iii FIGURES Figure 1 UPS controls and disp lay screen (w ith example of the monitor/mimic screen) . . . . . . . . . . . . . . . . 6 Figure 2 80 kVA UPS outside and ins ide views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv Figure 50 Options screen, page 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Figure 51 10% passive filte r settings screen . . . . . . . . . . . . . . . . . . . . . . . . .
v Figure 100 Summary page screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Figure 101 User settings, page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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1 I MPORT ANT S AFETY I NSTRUCTIONS SAVE THESE INSTRUCTIONS. This manual co ntains important ins tructions that shoul d be followed during maintenance of your Npower UPS and batteries. ! WARNING Exercise extreme care when hand ling UPS cabi nets to avoid equipment damage or injury to personnel.
2 O VERVIEW O F M AN UAL The Npower manua l is organized so tha t information can be found quickly. E ach major topic is sepa - rated by sections, and there is a Table of Contents for each section. The na mes of the sections and their contents are described below.
Introd uction 3 1.0 I NTRODUCTION 1.1 System Description The role of the UPS system is to supply uninterruptible, clean power to the critical load. It maintains a full-vol tage, low-disto rtion outp ut, ev en if the utility source power sags or becomes distorted.
Introd uction 4 1.1.1 Reliability Reliability is the most imp ortant design goal for Uninterruptible Power Systems. All Liebert 3-Phase UPS systems have demonstrated reliability by achieving a field-proven critical bus MTBF in excess of one million hours.
Introd uction 5 ONLY qualified service person nel should perform maintenance on the UPS system. When performing maintenance with any part of th e equipment under power, service personnel and test equipment should be standing on rubber ma ts.
Introd uction 6 1.3.4 Overload Overloads in critical systems may be caused by in rush currents during connected equipment startup or by faults in the criti cal load or di stribution network.
Introd uction 7 1.4 Operator Controls Liebert Npow er UPS modules are equippe d with a mi croprocessor-based Operat or Display Screen and Control Panel designed for convenient an d reliable operation.
Theory of Operati on 8 2.0 T HEORY OF O PERATION 2.1 General Compone nt Description The UPS system includes all of th e equipment ne cessary to continuo usly provide computer- grade AC power to a critical load, even when there is a n interruption of the ut ility line power.
Theory of Operati on 9 2.2 Det ailed Component Descriptions 2.2.1 Controls Hardware The Npower UPS operator interface display system is designed to provide all o f the information that is required for the operation of each UPS module. The following is a list of the hardware features: 1.
Theory of Operati on 10 2.2.2 Rectifier/Charger The UPS module rectifier/charger co nsists of input fuses, AC current -limiting circuit, battery equalize charge circuit, DC filter, battery charge-cu rrent-limiting circuit, and bridge rect ifiers. Operation The rectifier/charger converts the AC input power to DC power.
Theory of Operati on 11 Operation Af ter End-of-discharge The battery time screen displayed on the control panel enables you to esti mate when battery shut- down will occur. You will have enough time to energi ze an alternate AC p ower so urce or to initiate an orderly shutdown of the cri tical load.
Theory of Operati on 12 Nonlinear Load Characteristics Computers and computer equipment with sw itching power supplies ge nerate nonlinear currents rich in fifth and seventh harmonics.
Theory of Operati on 13 T ransfer and Retransfer Conditions 1. Automatic Transfers to Bypass: Critical bus con ditions that wil l initiate an au tomatic transfer of the critical load from the UPS inverter output to the bypass source are: a. Output Overload: overcurrent co ndition in excess of the current -versus-time over load capacity curve.
Operation 14 3.0 O PERATION 3.1 Operator Controls The Npower operator controls and indicators are lo cated on the UPS Module Cabinet doo r and inside the cabinet.
Operation 15 Figure 3 Operator control p anel T able 2 Key locations on operat or control p anel Item Description Function 1 Emergency Power Off Button Turns po wer off in an emergency situation. 2 Display Screen Enables Operator to monitor power flow and meter readings, receive reports, and execute operationa l procedures.
Operation 16 3.1.1 Operator Control Panel The Operator Control Panel enable s the op erator to perform the following tasks: • Obtain a quick indicati on of operational status: • Is the critical bu.
Operation 17 The SELECT button is used to select a particular item from the o ptions on the screen. When you press this button, the screen that is se lected will be immediately displayed. The UP and DOWN buttons are used to move the cu rsor around the screen in order to high light appropriate selections.
Operation 18 3.2 Security Access and Passwords Password protection is provided in the Npower UPS system to prot ect you from any unauthorized con- figuration of the system . A default password is installed on yo ur system when you receive it.The default password is NPWR.
Operation 19 3.3 Display Screens and Procedures The Operator Interface Display Syst em of the Npow er allows quick a ccess to any screen the operator chooses. The default screen is the Mimic Di splay Screen. MENU TREE The figure below shows the primary screens that you can access t hrough the Operator Interface Dis- play System.
Operation 20 Primary Screens The Main Menu has eight primary screens. Ple ase note that some screen s have multiple pag es because not all the informati on can fit on one page . To access the next pa ge , highlight NEXT and press SELECT. To acces s the previous page, highlight PREV and press SELECT.
Operation 21 Main Menu Screen The Main Menu contains the primary menu selections that monitor and control the operation of the UPS. To access one of these screens, use th e NAVIGATIONAL BUTTONS beneath the scree n. First, press the UP or DOWN button until the desire d screen is hi ghlighted.
Operation 22 In this example, power is av ailable from the normal and bypass sou rces, as well as from the battery. Notice that the switching devices ar e all closed except for the bypass switch at the top. The load is operating on conditioned power from the inverter.
Operation 23 In this example, the load is receiving power thro ugh the bypass switch. Noti ce that the input power source is available an d the battery is being charged.
Operation 24 Det ailed Information Report s Detailed information reports are availa ble through the following numbered blocks 1. INPUT STATUS. To access this screen, start with th e Mimic Display Scre en. Using the arrow keys, bracket INPUT and pr ess SELECT.
Operation 25 The DC BUS/BATTERY status scre en disp lays the following real-time data: • DC Bus Vo lts •B a t t e r y V o l t s • Battery Current (Chg/disch) • Battery Temperature (This readin g is the temperat ure of the ambient air in the battery cabinet.
Operation 26 The Output/Load status screen disp lays the following real-time data: • Output AC Volts AB, BC, CA • Output AC Volts AN, BN, CN • Output Current A, B, C • Output kVA, kW, A , B, C • Output Frequency • % rated kV A and kW • Overload Condi tion (with timer in s econds) 5.
Operation 27 3.3.2 St artup There are two start up scenarios wh ich can be fo llowed depen ding on whether there is already power supplied to the UPS and the UPS is o n Bypass, or there is no power to the UPS. Follow the appropri- ate instructions. First Scenario Power is not supplied to the UPS (U pstream breakers are open).
Operation 28 Second Scenario Power is supplied to the UPS and the UPS is supply ing the load. (Upstream breakers are closed). The UPS should be showing either the SYSTEM RATINGS screen or the Mimic display. If the SYS- TEM RATINGS screen is showing, us e the arrow keys to select SAVE & EXIT and push SELECT.
Operation 29 Manual St artup On occasion, a service technician may wish to start the UPS manua lly while performing diagnostic testing. The manual startup, like the auto startup, requires that the Rotary Switch be in the NO R- MAL position. To start the system manually, highlight MANUAL STARTUP and press the SELECT button on the navigation bar.
Operation 30 New Target and Ramp settings are temporary sett ings for diagnostic testing or special situations. Each time the UPS is placed onli ne, the settings return to the defa ult values. Custom T and R ent ries are only allowed when rotary swi tch is in Bypass position.
Operation 31 Figure 28 External maintenanc e bypa ss switch, single-input UPS The table below summarizes the External Maintenanc e Bypass switch posi tions and actions. When the External Maintenance Bypass switch is in Bypass or Maintenance position, the UPSC will assert the bypass contactor close signal and the outpu t contactor open signal.
Operation 32 External Maintenance Bypass Switch Configurations The External Maintenance Bypass Swit ch has three conf iguration options: • External maintenance by pass installed w ith interlock opti.
Operation 33 3.3.3 Shut down To shut down the UPS, navigate to the MAIN MENU, and select STARTUP/SHUTDOWN. Thi s action will disp lay the STARTUP/SHUTDOWN sc reen. From there, highlig ht USER SHUTDOWN and press SELECT. The following figure will appear.
Operation 34 The message Retransfer to UPS or Transfer to Bypa ss will appea r depending on status of th e critical load. The operator has two choices: Either to accept OK or EXIT. If a transfer or retransfer is not allowed, the FLASHING messa ge Transfer Not Allowed is displayed.
Operation 35 Event Log The Event Log screen displays the faults, alarms, and status messages. Every message will have a time and date stamp. The Event Log is a sequence of messages or events capt ured in individu al frames. See the following section on HISTORY LOGS fo r mo re information about frames.
Operation 36 Histor y Logs The History log contains pertinent data recorded just before and after an event that triggers a signifi- cant action such as an inverter failure.There are tw o History logs, each consisting of 64 frames. Each frame is a sequential sn apshot of UPS-generated parameters.
Operation 37 The second page is the STATUS, wh ich includes: • Static Bypass Switch Line (Open/Closed) • Static Bypass Switch Load (Open/Closed) • Input Contactor (Open/Closed) • Output Contactor (Open/Closed) • Trap Filte r (On/Off) (If i nstalled) • Int.
Operation 38 As previously mentioned, fau lts are shown in rev erse video, and alarms in regul ar video. For a com- plete list of all the alarm messages and co rrective actions for these faults, refer to Table 7 - Alarms, functions, and corrective a ctions .
Operation 39 System Ratings System rating parameters are normally entered by the factory or LGS. To get to the System Rati ngs screen, begin at the Main Menu. Using the arrow key s, move to Config- uration and press SELECT. This brings up the Configuration screen.
Operation 40 System Settings The System Settings are multiple screens that are used for setting the date, time, language, ID num- ber, Tag number and other parameters. The first page of the System Settings screen can be accessed by highli ghting Systems Settings on the Configuration screen ( Figure 40 ) and pre ssing SELECT.
Operation 41 Time To set the system's real time clock, do the following: 1. From the System Configuration screen, press th e Up or Down button to move the highlighted cursor to TIME. 2. Press SELECT. The TIME screen will appear. 3. Press SELECT to move the arrow to the next digit to the right.
Operation 42 Figure 47 System settings, p age 3 The Single / Dual Input Screen is passw ord protected. (See 3.2 - Securi ty Access and Passwords for more information on Security Access and Passwords .) After highlighting Si ngle / Dual Input from the System Settings Screen, and pressing SELECT, the followi ng screen will appear.
Operation 43 Options This multiple -page screen, access ed from the th ird page of the SYSTEM SETTINGS screen, enables and disables optional features wh ich might or migh t not be i nstalled in your UPS. To enabl e or dis- able one of these opti ons, d o the foll owing: 1.
Operation 44 Figure 52 Options screen, p age 2 Figure 53 Options screen, p age 3 Figure 54 Options screen, p age 4 OPTIONS 12 PULSE RECTIFIER 6 PULSE BA TTERY GND F AUL T NO GREEN MA CH INE NO LINE DROP COMPENSA TION NO PREV . EXIT NEXT FREQUENCY CONVERTE R NO OPTIONS AL TERNA TE POWER POLE F AN NO AUX.
Operation 45 Communication Options Communication options are the variou s options that enable the operat or to view data from remote locations and to program the type of data to be viewed. Fo r detailed informat ion, see Section 3.5 - Communication Interfaces .
Operation 46 To enable the modem, highlight INTERNAL or EXT ERNAL and press SELECT. The Auto Dial screen will return ( Figure 56 ) except instead of DISABLED, the me ssage will read INTERNAL or EXTER- NAL. After enabling the modem, the Operator can procee d to configure Auto Dial settings at the AUTO DIAL screen.
Operation 47 Figure 60 Communications options scr een, pag e 2 Select NEXT to go to the Communi cation Options screen, third page. User Settings The User Settings are accessed from the Configuration Screen ( Figure 40 ).
Operation 48 Figure 63 User settings scr een, p age 3 Figure 64 User settings scr een, Page 4 Figure 65 User settings scr een, p age 5 USER SETTINGS BA TT . EO D RAMP S T ART 15 BA TT . EOD RAMP END 60 BA TT . TEMP . ALARM LIMIT 40 BA TT . COMP ARTMENT TEMP .
Operation 49 Highlighting 10% PASSIVE FILTER SETTINGS will bring up the following Operator--interactive screen. Figure 66 10 % Passive filter settings screen Figure 67 User settings scr een, p age 6 F.
Operation 50 Figure 69 Factory settings scre en, page 2 Figure 70 Factory settings scre en, page 3 Alarm Mask The Alarm Mask sets parameters for all alarms th at affect the UPS and output channe ls.
Operation 51 Delay This refers to the time in seconds that must occu r before the UPS recognizes an alarm function. The delay can be anywhere from 0 to 99.9 seconds in 0.1 second intervals. If an alarm is set to Latch, it will only recognize the alarm an d latch after the delay period.
Operation 52 To change the programmable attributes, highlight th e attribute to be edit ed and press the SELECT button. This action brings up a scree n allowi ng the Op erator to toggle between YES and NO.
Operation 53 Figure 73 Cust omer alarm interf ace screen If there is no board, the “NOT INSTALLED” message is displayed. 3. Pressing NEXT will brin g up the second page.
Operation 54 To change the relay assignment, select RELAY ASSIGNMENTS from the screen and press SELECT. The following screen will appear. Figure 76 Relay assignment s If you select STD SET, the foll owing screen will be disp layed.
Operation 55 If the Operator selects USER DEFINED from the RELAY ASSIGNMENTS screen, the following screen will come up. Figure 79 Programmable output rela y board, user defined All User De fined relays are programmable. To begin programming the User Defined Relays, high light the relay to be programmed and press the SELECT button.
Operation 56 Navigating Protocol For the screen above and others like it, the normal screen navigation rules ar e changed. It is impor- tant to differentiate between the selections at the bottom of the displa y screen (UP/DO WN/ADD/ REMOVE/CLEAR/EXIT) and the navigation buttons or arrow keys below th e disp lay screen.
Operation 57 Figure 82 Manual transfer / retransfer screen when transf er is not allowed In the figure above, the message “TRAN SFER NOT ALLOWED” will be flashing. 3.3.7 Battery Management The Battery Management screens disp lay info rmation on battery self tests, battery equa lization, bat- tery temperature, and battery cycl e monitoring.
Operation 58 The following conditions and features apply to either Au to or Manual Mode: • If you go to the battery screen, it will indicate “Battery Test in Progress”. When the test is com- plete, the indication “L as t Battery Test” will eith er say “Battery Test Passed” or “B attery Test Failed.
Operation 59 To enable the Auto Battery Self Test, Select “Auto Test Enabl e” from the Battery Test scre en. Next, set the Date and Time at which the first test will be performed. Set the Test Cy cle period in weeks. (The range is 2-9 weeks and the default is 2 weeks.
Operation 60 Figure 88 Battery equalizer scr een From the Battery Equalizer Screen, you can choose one of the four op tions on the screen. The screens for these options are illustrated below.
Operation 61 Figure 91 Equalize time period screen When the battery is at full voltage (not being recharged), this selectio n reads EQUALIZE TIME PERIOD (hrs). Wh en the battery is recharging, this select io n reads EQUALIZE TIME REMAINING (hrs). After the equalize recharge time has expired, the indication re turns to the preset equalize time.
Operation 62 To enable or disable the Battery Temperature Cha rge, highlight the to p line in the screen ab ove and press the SELECT button. This will bring up th e following screen.
Operation 63 Figure 97 Battery cycle monitor scr een The second page, accesse d by selecting NEXT ( See Figure 98), allows the Operator to view the Sum- mary Page and to erase the BCM time bucket data permanently from the non-volatile storage. (This action requires the system password.
Operation 64 Selecting the TIME button will display the time stam p of each cycle for three seconds after which it repaints the column with DATE stamps agai n. Figure 99 0-30 seconds discha rge cycles SUMMARY PAGE LAYOUT The Summary Page Screen is accessed fr om the Battery Cycle Monitor Screen.
Operation 65 BCM DATA DEFINITIONS / STORAGE At the start of every discharge cycle, Time and Date are recorded along with Battery Compartment Temperature in degrees C. While th e cycle is in progress, the follow ing data are stored: Lowest DC Bus Voltage, Battery KW Hours, an d Highest Battery Discharge AMPS.
Operation 66 Highlight BATT TIME LOW WARNIN G and press SELECT to bring up the following password- pro- tected screen. Figure 102 Battery time low warning screen. After setting the time, press SELECT to save th e changes and return to the previous screen.
Operation 67 Figure 103 Auto rest art setting screen The source qualification timer dict ates how long to allow for in put and bypass voltages to return to their nominal limits.
Operation 68 3.3.9 System S tatus Monitoring In addition to the stan dard UPS metering and al arm information, Npow er monitors and cal culates other relevant data. This data can be accessed by starting from the Main Menu, selecting Status Reports, then System Status.
Operation 69 The Sign Off Date segu es to Sign Off Time and back every 5 se conds. Figure 106 System st atus screen, p age 2 Figure 107 System st atus screen, p age 3 A brownout occurs when an Input Un dervoltage condition exists for mo re than 5 minutes.
Operation 70 Once the “UPS Sign Off” is acknowledged, it is st amped with RTC time and date. This step must be performed by LG S personnel. The software will k eep track of the elapsed hours from that point on by subtracting the curre nt time and date from the sign off time and date.
Operation 71 3.4 Fault s, Alarms, St atus This section de fines the active f a ult, alarm, and status indi cators, their causes, and the associated system operations performed upon their detection.
Operation 72 The following faults are de tected by the UPS cont rols. Corrective actions, where possible, are auto- matic. • Active Filter Fail • Batter y Overtemp CB Tr ip • Battery Ground Faul.
Operation 73 Highlight the SELECT position on the display screen to bring up the Summary Alarm Editing screen, allowing the Operator to edit th e parameters of the summary alarm.
Operation 74 Alarm Messages The alarm message area displays the ala rm conditio ns that are present within the UPS system. The table below show s the default values of ma sks for each alarm/fault, the me aning of the Alarm and possible corrective actions.
Operation 75 Trap Fuse Fail Trap Fuse Fail Fault NO YES NO YES On units equipped with an input fi lter, Control Logic has determined that one or more of the filter fuses is open. The logic will open the In put filter contactor. The UPS will continue to run, wi thout input filterin g.
Operation 76 Inverter Ovld xfer Inverter Overload Transfer Fault YES YES YES YES With the load on UPS, at least one ph ase of the UPS KVA or KW has e xceeded the rated KVA, KW, or RMS current vs. Time equation. (Note: This fault would h ave been preceded by an “Inverter Overload Phase x alarm.
Operation 77 Inv I limit xfer Inverter Current Limit Transfer Fault NO YES NO YES The instantaneous inverter current of any one phase has exceeded its Pulse by Pulse current limit value. An “Inverter Current Limit” alarm was already issued and pulse parallel operation wa s in itiated.
Operation 78 Hsink ovtemp limit Heatsink Overtemp Limit Fault YES YES YES YES The maximum heat sink temperature li mit has been exceeded. (Sho uld be preceded by a “Heatsink” Overtemp Warning alarm). The load will be transferred to the Static Bypass if available.
Operation 79 Rectifier Fail Rectifier Fail Fault YES YES YES YES This is a summary e vent based on the detection of at least one of these faults being active: Battery Overcharge; DC Overvoltage Steady.
Operation 80 Batt Discharging Battery Discharge Alarm NO YES NO YES The batt ery is dischar ging. This occurs whenever the battery supplies po wer to the load for more than five seconds because of input power failure, a recti fier problem, or an overload condition.
Operation 81 Input OverVoltage Input Over Voltage Alarm NO NO NO YES For all of these input problems the system will supply power from the battery until the end of discharge. At that point single inpu t systems will lose power to the load. Dual input systems will atte mpt to transfer to bypass if qualified and available .
Operation 82 SBS Ovld Phase A SBS Overload Phase A Alarm NO NO NO YES With the load on Static Byp ass, the phase A output kVA or kW or RMS current has exceeded 115% of the nominal pe r-phase kVA or kW or RMS cu rrent rating. The UPS will show time remaining until a shutdown will occur, per the Overload vs.
Operation 83 Inv Ovld Phase C Inverter Overload Phase C Alarm NO YES NO YES With the load on UPS, PhaseB output KVA or KW or RMS current has exceeded 105% of the nominal per phase rating. The UPS will begin sending the time remaini ng until a transfer or shutdown will occur, per the Overload vs.
Operation 84 Batt Gnd Fault Battery groun d fault alarm Alarm NO YES NO YES With the Batt Gnd Fault optio n installed and the batt breaker closed, the DSP sees its BGF input asserted by the SWGR.
Operation 85 System Fan Fail System Fan Fail Alarm NO YES NO YES A fault in the de signated Fan motor has occurred. This condition only causes an alarm, but if not promptly corrected it could cause an equipment o ver-temperature condition that would shut do wn the UPS Module.
Operation 86 Delayed Batt Charge Delayed Battery Charge Alarm NO NO NO YES The generato r option is installed, the system is on generator and the “Delayed Battery Charge” is suppressing battery charging to reduce the load on the generator.
Operation 87 Auto Restart Failed Auto Restart Failed Alarm NO NO NO YES If Auto Restart feature is installed and enabled, and the last shutdown was due to a failed Batt Low Transfer, the Monitor will automatically attempt to perfo rm the “normal” startup sequence when power is reapplied to norma l value.
Operation 88 3.4.3 St atus Status conditions give the Operator addi tional knowledge about UPS operation. Some are indicated on the Mimic Display screen by a text message while others are depi cted graphically. The following status messages may appear in the Operator disp lay.
Operation 89 3.5.1 RS-232 Port: Local Reporting T erminal The Npower transmits UPS system status and history information to a remote terminal through an RS-232 Port in ASCII Format.
Operation 90 Requesting Information If your Npower UPS is equipped with a modem and telephone lin e, you can call the UPS and receiv e system status and historical informati on. You can pl ace the call from either a remote terminal or a personal computer with a communications program.
Operation 91 PROTOCOL The pager module uses the Telocator Alphanumeric Protocol (TAP), which is the protocol used for SkyTel pagers. A copy of this prot ocol is included with th e pager option. Pager suppo rt requires the same hardware that modem su pport requires.
Operation 92 3.5.5 Setting Up External Communication Devices All external communication devices, including the modem, are o ptional equipment. Connections to communication ports are made by wiring cables to terminal boards. Connectio n points are shown on the Control Wiring Interconnect Diag ram in the Installation Manual.
Operation 93 Figure 1 13 Load on byp ass (UPS available and batter y charging) 3.6.3 Moment ary Overloads An overload in the critical load will continue to be supplied by the UPS system if the overload condi- tion does not exceed the cu rrent versus time curve of ov erload capacity for the UPS.
Operation 94 3.6.5 Automatic Operations The Npower UPS is designed to f unction while attended or unattend ed by an Operator. The system control logic monitors the performance of the UPS, the availabili ty of power s ources, and the current required by the critical load.
Operation 95 Automatic Module Off Line For specified UPS system faults, the control logic will initiate an automatic transfer to bypa ss fol- lowed immediately by a shutdown and isolation of the UPS system. All UPS contactors and the bat- tery circuit breaker are opened.
Maintenance 96 4.0 M AINTENANCE 4.1 Safety Precautions Observe the safety precautions in 1.0 - Introduction . ONLY qualified service personnel should perform maintenance on the UPS system . Observe ALL of the warnings and cautions belo w before performing ANY maintenance on the UPS System and associated equipment.
Maintenance 97 4.2 Routine Maintenance You are encouraged to become thoroughly familiar wi th the equipment, but at no time should you go beyond the specific procedures in this manual wh ile performing maintenanc e or correcting a malfunc- tion.
Maintenance 98 4.2.4 Battery Safety Precautions Servicing of batteri es should be performed or supe rvised by personnel expe rienced with batt eries and the required precautions. Keep unauthorized person nel away from batteries. When replacing batteries, use the sa me number and type of batteries.
Maintenance 99 The equalizing charge time period is adjustable from zero to 72 hours and can be initiated automati- cally or manually . Refer to Battery Equalizer on page 59 . * To be completed by Liebert Global Services customer engineer at time of start-up.
Maintenance 100 4.3 Detecting T rouble It is important that the operator check the inst rument readings if abnormal equipment performance is suspected. Any metered valu e that differs appre ciably from no rmal could mean an impending mal- function, and should be investigated.
Maintenance 101 NOTES.
Maintenance 102.
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