Liebert Series Uninterruptible Power System (UPS) for the Single Module The Series UPS has been designed for Commercial/Industrial use only. Single Phase UPS system S i n g l e m o d u l e a n d ‘1 + N’ (e x p a n d a b l e) UNINTERRUPTIBLEPOWERSYSTEM User Manual EMERSON Network Power. Single phase ups system • Read online or download PDF • Emerson User Manual.

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If this is your first Liebert UPS, we hope it is the beginning of a long relationship which delivers value to your organisation. If you already own and use a Liebert, we are doubly honoured by your decision of continuing this relationship. It is our constant endeavour to partner you for the growth and success of your business. Please do give us feedback to help us realize our Mission.

All relevant parts of the manual should be read prior to commencing installation. The UPS must be commissioned by an engineer approved by the manufacturer or his agent before being put into service.

Failure to observe this condition will invalidate any implied warranty. If you encounter any problem with the procedures contained in this manual you should seek immediate assistance from Emerson Network Power India Pvt. Sales Office from whom the equipment was purchased. In a domestic environment, this product may cause radio interface in which case the user may be required to take additional measures. This equipment electrical codes.

The risk of contact with these is minimised as the live component parts are housed behind a hinged, lockable door. Further internal safety screens make the equipment protected to IP20 standards. No risk exists to any personnel when operating the equipment in the normal manner, following the recommended operating eemerson.

All equipment maintenance and servicing procedures involve internal access and should be carried out only by trained personnel. These precautions should be followed implicitly at all times.

Particular attention should be paid to the recommendations concerning local environmental conditions and the provision of protective clothing, first-aid and fire fighting facilities TEST EQUIPMENT When the battery 7400mm under charge, it is earth-referenced about its mid-point —e. When using mains-powered test equipment such as oscilloscopes in the UPS voltage area, always use a differential mode of operation to disconnect emfrson oscilloscope frame earth. Some of the power meerson are very heavy.

If their removal is necessary, ensure that sufficient manpower is available; otherwise use adequate mechanical handling equipment. When working in the general area of the UPS where high voltages are present, a second person should be standing-by to assist and emrrson help in case of accident.

Being designed to furnish a well regulated 1 PH output power supply under all rated load and input supply conditions the system offers the users the following advantages: The UPS has its own internal voltage and frequency regulator circuits which emersn that its output is maintained within close tolerances independent of voltage and frequency variations on the mains power lines. By rectifying the input AC power to DC power, and then converting it back to AC, any electrical noise present on the input mains supply line is effectively isolated from the UPS emerspn, therefore the critical load sees only clean power.

If the mains power fails, the UPS continues to power the critical load from its battery source, leaving the load immune from power disturbances. In a non-redundant module configuration, the system is sized such that both UPS modules are required to feed the potential load, and if one of the two modules develops emsrson fault, or is for some reason shut down, the other module automatically shuts down also.

In such an emerdon the load is transferred to an unprocessed bypass supply as described later. In a redundant module configuration the system is sized such that the potential load can be provided by just one of the two modules. Under normal circumstances both modules are operational and share the load current equally; but if one module develops a fault, or is shut down, the second module is able to take over the full load demand and continue to provide it with processed, backed-up power.


The advantages of meerson redundant system over a nonredundant system in terms of overall system reliability are selfevident. During normal operation both the rectifier and inverter sections are active and provides regulated load power whilst simultaneously float charging the battery. In the event of a mains power failure, the rectifier becomes inoperative and the inverter is powered solely from the battery. Critical load power is maintained under these conditions until the battery is fully discharged, whereupon the UPS shuts down.

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The end of battery discharge is assumed when the battery voltage emeerson to Vdc. It is usual in larger installations to provide an alternative UPS input power source from a stand-by generator 4700m the mains supply fails. Once such a generator has been brought on-line, and the UPS input power has been re-established, the batteries immediately begin to recharge.

Modern generators can be started and brought on-line very quickly and where such a facility is incorporated into the UPS installation it results in short battery discharge periods and correspondingly rapid recharge times. Series UPS Isolator configurations 1.

Normally, the load is connected to the inverter; but in the event of a UPS overload, emrson inverter failure, it is automatically transferred to the static bypass line due to static switch action. Note that the Bypass supply should be in normal condition and enabled. To provide a clean no-break load transfer between the inverter output and static bypass line, the inverter output and bypass supply must be fully synchronised during normal operating conditions.

This is achieved through the inverter control electronics which make the inverter frequency track that of the static bypass supply provided that the bypass remains within an acceptable frequency window. Emedson purpose it to enable the critical load to be powered from the mains bypass supply while 740m UPS is shut down for maintenance or troubleshooting. The emedson switch locations in the various models are shown in Figure 3.

With the exception of the maintenance bypass isolator, all the isolators shown must be closed during normal UPS operation. Fitted to the UPS Logic Board, the reset switch is used by the operator to retransfer the load to the inverter following a detected overload or overtemperature fault.

This circuit breaker is closed manually, but it contains an undervoltage release coil which enables it to be tripped from the UPS control electronics following certain detects for faults.

It also has a magnetic trip facility for overload protection. Communication takes place via a single ribbon cable connected between the modules as illustrated in figure 4. This means that although it is not impossible to modify an existing module to form part of a one-plus-one system it is not a straightforward proposition.

The inter-module parallel control responsibilities are complex but can be summarised as follows: As the outputs from both UPS modules are connected together to provide emegson single load supply, it is imperative that the 74000m are fully synchronised both in frequency and phase.

This is achieved by digitally locking the two inverter control oscillators.

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The inverter control oscillators are therefore not only locked together but are also made to 7400k the bypass frequency. If a non-redundant mode is selected the two emfrson switch sections are effectively locked together in that both the static switches are turned off or on by a single control signal.

Thus if one module develops a fault, when running, emrson static switch control logic will transfer its output from the inverter to the static bypass line and simultaneously send a signal to the static switch control logic in the second module to do likewise. This does not happen if the system is configured as a redundant system, in which case the second module is allowed to continue supplying the load from its inverter when the first module trips its inverter off line.

Such a condition can arise if a module develops an internal power fault or if for some reason the two modules become unbalanced, and is liable to further damage the module and also degrade the load supply. If a reverse current is emeraon the inverter on the affected module is immediately shut down and load transferred to the bypass supply depending on the system redundancy configuration.


Parallel control in a one-plus-one system Battery charge current sharing: The illustration in figure 4 shows a dedicated battery installation for each module; however, it is possible to fit an option kit which allows the two modules in a one-plus-one system to share a common battery. Such an installation is shown in figure 5 overleaf.

Each 7400n monitors its battery charge current and compares it with the charge current provided by the other module. This enables a module to emetson its charge current to that of its partner by effecting fine voltage control over the rectifier section. The components used by the Common Battery Option are contained in a separate cabinet known as the Common Battery Panel.

Emerson User’s Manual |

Operator Control Panel 1. These LEDs, which are annotated in figure7, show the current UPS operational status and should be interpreted as detailed below. LS2 – Battery volts OK: This led illuminates when the battery circuit breaker is closed and the battery voltage is within the UPS operating range – VV nominal. LS3 – Bypass supply OK: LS4 – Inverter-output OK: This led illuminates when the inverter is operating and its output is within a preset acceptable voltage window. This led illuminates when the output isolator is closed and the load is connected to the bypass via the static switch.

LS6 – Load on Inverter: This led illuminates when enerson output isolator is closed and the load is connected to the inverter via the static switch.

Control switches Seven tactile switches are located on the Operator Panel, together with an emergency stop push button which is fitted with a safety cover to prevent inadvertent operation. Switch S1 Vo – Output volts: When this switch is pressed, the lower line of the LCD Display shows the output phase voltage w. Switch S2 Fo – Output frequency: When this switch is pressed, the lower line of the LCD Display shows the output frequency.

Switch S3 Io – Output current: When this switch is pressed, the lower line of the LCD Display shows the output current. Switch S4 B – Battery: When this switch is pressed, the lower line of the LCD Display shows the battery voltage and current. Pressing this switch 7400, the audible alarm.

The alarm led and messages will remain active if a detected fault condition is still present. Pressing this switch turns OFF the inverter and causes the load to be transferred to the static bypass supply. Pressing this switch activates the inverter and causes the load to be transferred to the inverter side of the static switch after the inverter voltage has had time to stabilise. Switch Emersson Emergency Stop: When the emergency stop switch is pressed it disables the static switch block entirely so removing load power.

It also disables the rectifier and inverter, and trips the battery circuit breaker. There are two LEDs contained within the switch panel area: This led accompanies the audible alarm warning when any alarm condition is initiated. The audible warning can be cancelled by the reset switch S5 but LS7 will only extinguish after the 740m condition has reverted to normal. LS8 – Inverter status: This green led situated near the inverter ON switch illuminates when the inverter is selected ON.

An LCD display, capable of showing two rows of 40 characters, is used to indicate the UPS operating parameters, warnings and alarms.

A DIP switch fitted to the display microprocessor board enables the displayed language to emfrson easily selected to English, French, Italian, Spanish or German.

Warning and alarm messages are displayed on the upper row of characters.