MESTA UPS500-43 Manual de usuario

MESTA ELECTRONICS, INC.

Uninterruptible

Power

Supply

Owner's Manual

MODELS: UPS500-43,UPS750-43,

UPS750-83, UPS1000-83, UPS1250-84

11020 Parker Drive §N. Huntingdon, PA 15642

412/754-3000

SAVE THESE INSTRUCTIONS -THIS MANUAL

CONTAINS IMPORTANT SAFETY

INSTRUCTIONS

CONSERVER CES INSTRUCTIONS -CETTE

NOTICE CONTIENT DES INSTRUCTIONS

IMPORTANTES CONCERNANT LA SÉCURITÉ.

Models: UPS500-43 –UPS1250-84

Table of Contents

1. INTRODUCTION................................................................................................................................1

2. GENERAL DESCRIPTION.................................................................................................................2

3. INSTALLATION..................................................................................................................................4

4. OPERATING PROCEDURE...............................................................................................................6

5. RS232 INTERFACE...........................................................................................................................8

6. STORAGE........................................................................................................................................11

7. INTERNAL MAINTENANCE.............................................................................................................12

8. BATTERY INFORMATION...............................................................................................................13

9. TROUBLESHOOTING .....................................................................................................................16

APPENDIX A. UPS SPECIFICATIONS BY MODEL.............................................................................17

APPENDIX B. DRY CONTACT STATUS INDICATION........................................................................19

APPENDIX C. WARRANTY/SERVICE AND REPAIR..........................................................................20

List of Illustrations

Figure 1. UPS Battery Shelf Configuration...........................................................................................14

Figure 2. UPS Lower Battery Shelf Configuration................................................................................15

List of Tables

Table 1. UPS Software Parameters.......................................................................................................9

Table 2: RS232 Technical Specification Summary ..............................................................................10

Table 3: RS232 9-Pin D-Connector Pinout...........................................................................................10

(Page Intentionally Left Blank)

1. INTRODUCTION

Thank you for buying the Mesta Electronics UPS! You are now an owner of a TRULY

UNINTERRUPTIBLE POWER SUPPLY. No other system on the market can match your UPS.

SAVE THESE INSTRUCTIONS—This manual contains important instructions that should be followed

during installation and maintenance of the UPS and its batteries. Please read this manual thoroughly

before installation and operation of your new unit.

WARNING—Your UPS contains up to eight 12 volt batteries wired in series providing a total nominal

DC voltage of 96 volts. This voltage is used to power the UPS when the AC utility is not available.

Because of the presence of this high voltage energy source, even when the power cord is not plugged

in, certain precautions must be taken to avoid possible injury should you need to enter your unit.

Before attempting to enter your unit, read the sections of this manual on "Internal Maintenance" and

"Battery Information" for important safety precautions.

2. GENERAL DESCRIPTION

As computers become increasingly fundamental to today's businesses, protection against power

disruptions has never been more critical; and since vital data and hardware are threatened by routine

sags, surges, spikes, and transients—as well as major blackouts—protection must be constant and

instantaneous.

The Mesta UPS system provides this kind of comprehensive protection by maintaining a clean, well-

regulated flow of power to critical loads, regardless of the quality of incoming AC line power. It

remains in a constant state of readiness, so there is no time delay in compensating for AC line

failures.

Unlike many competitive units, the Mesta UPS system is truly uninterruptible. It remains in a

constant state of readiness, so there is no time delay in compensating for AC line failures. In contrast,

other systems may exhibit delays of 4 to 10 milliseconds—long enough to cause serious losses of

data or equipment.

Unique microcontroller intelligence plus state-of-the-art components and manufacturing procedures

yield outstanding capabilities in the Mesta UPS system. Using a proprietary pulse-width-modulation

technique, the microcontroller directs the system to produce a very low harmonic, high quality sine

wave output—perfectly matched in phase and voltage to the AC power line. The result is a

completely seamless transfer of the load from the inverter to the utility and vice versa during a power

disturbance or outage.

This zero-transfer-time feature, combined with a high frequency switching and custom magnetics,

results in a high operating efficiency of at least 92 percent and a total harmonic distortion of less than

one percent.

Because the microcontroller continually monitors the load and the power line, the Mesta UPS system:

•Starts under load with no damage to itself or the load.

•Handles nonlinear loads that require users of other UPS systems to buy more expensive,

higher rated units than they would otherwise need.

•Provides current limiting and short-circuit protection. The UPS provides a 300% overload

current limit for a finite time (the UPS1250 unit provides 400%), and a short circuit placed

directly across the output will not damage the UPS or the load.

The Mesta UPS system also features:

•High Reliability thanks to the large-scale integration and generous overrating of all power

components. Its modular design provides for quick and easy maintenance should it ever be

needed.

•A more compact footprint and lighter weight than other UPS units, because of its custom

transformer and intelligent operation.

•Quiet operation .5KVA through 1.25KVA units produce less than 35 dBs of audible noise, a

level that is virtually indistinguishable from ambient noise. (In contrast, most other similarly

sized UPS units are many times louder, generating from 45–75 dBs.)

Straightforward controls make the Mesta UPS easy to operate, and audible and visual signals provide

clear indication of system status. In the event of a power line outage, the system:

•Sounds an intermittent alarm after seven seconds. (The seven second delay eliminates

nuisance alarms from minor fluctuations.)

•Supplies power at maximum load for 8 to 20 minutes, depending upon model. (See

specifications for your specific model.) These times will be longer at lesser loads.

•Sounds a continuous 30-second alarm when the usable battery has declined to 10 percent of

its full capacity.

•Automatically goes into a state of inactivity once regulated output can no longer be maintained,

waiting for the return of AC line availability. During this state of inactivity the logic will continue

to look for the AC power to return in order to restore normal operation. If no AC power returns,

however, after 2 hours the entire system will shut down, to protect the batteries from being

deep discharged.

Once the AC power returns, the system's microcontroller employs optimum charging techniques to

extend battery life while minimizing charging time. The microcontroller follows a unique algorithm by

which it regulates the charging process and enables a minimal recharging time. This very special care

given to the batteries also eliminates the corrosion buildup you may find on the terminals of other

systems that employ trickle charge or other techniques for recharging batteries.

Your unit may come with one or more options indicated by suffix letters following the end of your

model number. Some explanation is necessary for a few of these options:

-BAutomatic Bypass Option. Units equipped with this option have an internal "bypass" relay that

normally selects the UPS output voltage to be directed to the output receptacle of the UPS.

However, in the unlikely event that a failure occurs in the UPS and it is unable to continue to

drive the load, this relay automatically switches to allow the utility to drive the load directly. Thus,

if the utility is present, the load will continue to be powered uninterrupted. One should also note

the following feature of this option: If the UPS is turned off from the from panel, the "bypass"

relay will switch to power the load from the utility so the load will not power down. To power

down the load, either shut the load off, unplug the load from the UPS, or unplug the UPS from

the utility just before or after the UPS is turned off.

-IIsolation Option. Units equipped with this option have outputs that are totally transformer

isolated from the utility (even if the unit is equipped with the -B option and the unit is in the

bypass mode). The output neutral is internally connected to chassis ground in these units. This

option results in a UPS that is slightly larger and slightly less efficient than standard models.

YOUR INVESTMENT IN MESTA'S TRULY UNINTERRUPTIBLE POWER SUPPLY INSURES THE

VALUABLE POWER PROTECTION YOU NEED.

3. INSTALLATION

Unpacking: Before unpacking your unit, examine the shipping carton for damage. If there is any

obvious damage, report it immediately to the dealer or carrier. If no damage is found, unpack the unit

and inspect it for shipping damage. Again, in case of any damage, report it directly to the dealer or

the carrier.

Environment: The MESTA UPS is designed to be used in a temperature controlled, indoor area free

of conductive contaminants, having a temperature range of 0–40°C and relative humidity of 0–95%,

without condensation. The site should not be excessively dusty or dirty. Clearances should be

provided to the front and back of the unit so as not to block air inlets and outlets. Also, keep the top

of the unit clear of objects. The unit should never be used to sit or stand on.

Location of Unit: The UPS should be in close proximity to the protected equipment: the longer the

AC wire runs, the more voltage drop and more risk of noise getting back into the system there are.

Voltage/Power Rating: Make sure that the voltage and power rating match the available line voltage

and load requirements. This can be done by comparing the input and output information printed on

the rating plate of the UPS with your requirements.

Power Cord Plug-in: Having verified voltage and power ratings, you are now ready to plug the UPS

into the AC power. Your unit will have a detachable power cord that was shipped with the unit. Use

only this cord with your UPS. Do not substitute other cords in its place as their current ratings may not

be sufficient for your UPS needs. Plug the detachable cord into the UPS input receptacle. Now plug

the AC power cord into the utility receptacle at your facility.

UPS Power On: Having plugged your UPS into the AC utility, you may now turn on your UPS using

the front panel power switch. Press the "ON" button. After a few seconds delay, the UPS will begin

operating. Initially (for a very short period of time) all front panel lights will flash on simultaneously,

and the audible alarm will beep once. Then the UPS will power up with the "UPS ON" green front

panel light on. If the AC power utility is present and within tolerance of the UPS microcontroller

standards, the "ON LINE" and "BATTERY STATUS" green front panel lights will also be on. The

yellow "ON BATTERY" light will be on momentarily until the microcontroller determines that the UPS is

able to derive power from the AC power utility and no longer needs the batteries. Then the UPS will

be drawing the average power that it needs from the utility only, and this light will cycle off.

Fault Checking: If the normal UPS Power On sequence does not occur for you, perform one of the

following alternative actions:

1. If the "ON LINE" light does not come on, and the yellow "ON BATTERY" light remains on (also

eventually to be accompanied by an audible beeping alarm), recheck your connections to the AC

utility. (Also check to see if any breakers or fuses in that particular circuit of your building are

open.) If after rechecking, no problem is found, and the UPS will not perform according to the

proper procedure described above, contact the factory for further assistance.

2. If the normal UPS Power On procedure is not observed, and the warning conditions described in

alternative #1 are also not observed, contact the factory for further assistance.

Connecting the Load: Assuming that normal operation was observed, you can now plug your loads

into the receptacles at the back of the UPS. If during this procedure the "OVERLOAD" red light

comes on along with an audible alarm, your load is too large for the UPS, and some must be removed

or the UPS will shut down.

Installation Complete: Assuming an overload doesn't occur prior to attaching and turning on all

loads, you have completed the installation procedure of your UPS. From here on there is no special

powering up or powering down sequence that needs to be followed for either your load equipment or

the UPS. This installation procedure is only necessary to insure that the UPS did not incur any

internal shipping damage and that your building's AC utility is getting to the UPS.

Computer Terminal Connections: It is also suggested, but not required, that you connect a terminal

or computer to the RS232 interface (see section of the manual pertaining to this interface). Through

this communications interface, you can obtain additional useful data that is either very difficult to

determine or is not explicitly available from the front panel lights. One of these parameters is the load

on the UPS. The microcontroller will indicate the ampere and volt-ampere load on the UPS. From this

information you will be able to determine if additional loads may be added in the future. It is advisable

that the steady state load observed on the UPS be limited to approximately 80 to 85% of the full rating

of the UPS under normal operating conditions. This should provide enough margin under most

operating conditions.

4. OPERATING PROCEDURE

SYSTEM TURN-ON

Once plugged in and turned on, the MESTA UPS will be supplying power to the load. The green

"UPS On" light will be on solid, the green "On Line" light will be on solid and the yellow "On Battery"

light will be off solid, if the utility (AC line) is present. The green "Battery Status" light will either be on

solid or flashing, depending on the charge status of the battery. The above light combinations

indicate normally conditions. If the utility fails or goes out of voltage or frequency tolerance, the "On

Line" light will go off and the "On Battery" light will come on (indicating that the UPS is using power

from the battery to power the load). In addition, if the utility is gone for more than 7 seconds, an

intermittent audible alarm will sound to warn that the UPS is using battery power. This alarm will

continue for 30 seconds or until the "Alarm Reset" button is pressed.

Occasionally, the "On Battery" light may flicker while the "On Line" light is lit, as the utility voltage or

the load changes. This is normal. Other light combinations indicate abnormal conditions. See

explanations below for additional information.

UPS On (green) Indicates UPS is turned on.

On Line (green) On solid indicates AC line voltage and frequency are within tolerance. Off solid

indicates AC line is not within tolerance. Flashing once per second with a 50% duty cycle

indicates a problem (see On Battery description below).

On Battery (yellow) On solid indicates UPS is drawing power from the batteries to supply the load.

Flashing once per second with a 50% duty cycle indicates UPS output is shut down due to an

abnormal condition. In this case, the status of the "On Line", "Battery Status", and "Overload"

lights indicate the reason for the abnormal shutdown as follows:

1) If all three of these other lights are also flashing in unison, UPS has detected an internal

failure and you need to contact the factory. If possible, while the UPS is flashing the lights in

this manner, press and hold in the "Alarm Reset" button and observe which lights are on and

which are off, while holding in the button. Record your observations, as this is diagnostic

information that will help the factory determine the problem. Note: the audible alarm will sound

continuously while you are holding in the "Alarm Reset" button.

2) If the "Overload" light is on solid, UPS shut down because of an overload. Check your load

for possible problems; then, press the "Alarm Reset" button to restart the UPS. You must wait

at least 30 seconds after the UPS has shut down from an overload before the UPS will let you

do this.

3) If the "Battery Status" light is off completely, then the UPS shut down because the batteries

are discharged. The AC line must be present for the UPS to restart when its batteries are

discharged. If the "On Line" light is on and the UPS is not running, press the "Alarm Reset"

button to restart the UPS.

Battery Status (green) Indicates charge status of batteries as follows:

On solid -- batteries are at least 90% charged.

Off solid -- batteries are discharged (less than 2%).

Flashing with 75% duty cycle -- 50-89% charged.

Flashing with 50% duty cycle -- 25-49% charged.

Flashing with 25% duty cycle -- 10-24% charged.

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