Frequently Asked Qustions

Find your answers here.



The mathematical relation is kW= kVA *pf. where kW is active or useful power and kVA is the vector sum of active power and reactive power. The equation therefore is kW= kVA *pf

Power factor is a function of phase displacement angle between voltage and current and distortion factor. It is calculated as a ratio of real power to apparent Power drawn by load. PF is low at lower loads and goes on improving at higher loads. PF is also lower at higher input voltage and goes on improving as voltage reduces. Input Power Factor is independent of type of load for double conversion technology.

In synchronous mode this break is less than 5 ms because of Static Switch in output and Inverter is in phase and frequency locked with Bypass. In case of Asynchronous mode it is between 15-20 ms.

600kVA, multi module. Three modules of 200kVA (each) can be paralleled for expansion up to 600 kVA or for redundancy.

Estimate steady state (normal running) power consumption (in kVA) of the total load first. Determine inrush power (kVA) of the largest load in the total load distribution next. The rated kVA capacity of the UPS should be 85% of the sum of above two [Steady state kVA + Inrush kVA].

This is under the assumption that all loads are not switched on at the same instant and largest load is started while all remaining loads are running.

Total Harmonic Distortion is measured using Distortion meter. For linear load it is less than 1% typical and less than 2% maximum. For nonlinear load with crest factor 3:1 it is less than 5%.

125% Continuous, 150% for 30 seconds switch to bypass.

Resistive load and non linear load for normal testing and Inductive load on special request of inspection authority.

Fans are provided for cooling of wire wound components as well as cooling of heat sinks. If these fans fail, internal temperature of the unit will increase and when the heat sinks temperature rises above 850 degrees Celcius it will give indication of ‘Over Temperature’. If this condition persists, Inverter will be switched off after 2.5 Minutes.

To protect the Cooling FANs all ALP series HiTA UPS systems are having intelligent FAN speed control. The system processor determines the optimum speed the cooling fans should rotate at, depending upon the exact load on the UPS, so as to provide the optimum cooling for the load and at the same time protecting the life of the FAN. (Less the speed more is the life of the FAN).

IP 20 even with front door open. IP 31 on special request.

Yes, double wound isolation transformer of full load UPS rating is used at inverter output, which ensures complete isolation from input.

Yes, provided bypass isolation transformer is used or the operation of static switch is permanently disabled.

True Online (Double conversion technology) UPS systems. However, HiTA also manufactures Line interactive UPS systems upto 3 kVA capacity.

Burn in test means UPS kept in running condition at some load or at no load. Burn in test at full load and for minimum 8 hours is carried out on every UPS.

Fan failure is not directly indicated because on failure of fan heat sink temperature of UPS will increase and this rise depends upon percentage of load on UPS. Fan failure is indirectly indicated as ‘Over temperature’.

Hookup UPS to network via our SNMP agent called NetAgent, Load either RUPS-II or UPSilon on one of workstation in your network to receive traps from UPS or install SNMP manager on NMS.

All HiTA UPS can also be used to provide auto shutdown facility. All that is required are relevant Software (Available with HiTA) and the connecting cable for connecting HiTA UPS to the Workstation through serial cable.

Yes through Multiport or Using UPSCOM (Network Shutdown License) in Network environment.

RUPS-II / UPSilon are primarily used for standalone configuration while UPSCOM is used for Network configuration based on SNMP protocols.

Multiport is a device used to hookup more than one workstation to one UPS, while UPSCOM is a software package used to carry out auto shutdown of one or multiple workstations using Network Shutdown licens.

RUPS-II, UPSilon and UPSCOM provides auto shutdown for windows 2000.

SNMP Card along with UPSCOM Software can be used to monitor HiTA ALP UPS in network.

You would be requiring the SNMP hardware NetAgent with the valid TCP/IP address and Ethernet port along with the SNMP Manager (UPSCOM) for specific NMS.

Enjoy Our Newsletter