Our rental system can be combined in parallel with any ELPA-SINE 3750 units you have previously purchased, providing they have the same nominal outputs. This allows any short term requirements outside of usual operating ranges to be met. Up to 8 ELPA-SINE systems can be arranged in single phase parallel connection.

The current is actively shared between each load. The ammeter of the master unit shows the total current that is the sum of all ammeters, The voltmeters of the slaves will show SL1 and SL2.

The ELPA-SINE is able to operate at maximum current across most of its voltage range. This allows one system to test many different types of AC and DC devices. When operating below 50V, the maximum amount of current that the load can sink decreases. Example values for this derating at low voltages are provided below.

The ELPA-SINE features constant current, constant voltage, constant power and constant resistance modes as standard. A linear constant current mode is also provided. The fast voltage transient response of the linear CC mode makes it especially suitable for non-sinusoidal AC voltage inputs such as step waveforms, square waveforms and any AC input voltage with a highly distorted waveform.

An adjustable frequency up to 440Hz is provided, as well as DC operation. Peak currents can be simulated with the crest factor mode. A leading or lagging power factor can be set with adjustments from unity to 0 lagging or leading. The desired wave can be recalled from the front panel or selected via an optional computer interface. 

Multiple inbuilt tests include UPS efficiency, PV inverter efficiency, UPS back-up time, battery discharge time, UPS transfer time, short circuit and fuse/breaker trip testing. Other interesting features of the ELPA-SINE include a turbo mode which can test currents up to double the maximum current of the unit up to 1 second, ideal for inrush current testing.

Rectifier Load Simulation

The electronic load features a rectifier load mode. This allows users to test IEC test specification requirements for the UPS, IEC 62040-3 UPS Efficiency Measurement Non-Linear and IEC 61683.

Battery Discharge Function

Three inbuilt battery discharge tests are provided. The battery tests allow the user to set a voltage threshold to stop the discharge, avoiding accidental damage to the battery. Capacity in Ah, discharge time and voltage can all be read from the display.

Front Panel Control and Memory

Front panel control is provided, which all the unit's test and operating modes can be implemented through. A four digit display simultaneously provides actual values taken by the load. Users can toggle between various measurements for: voltage, current, power, frequency, crest factor, power factor and harmonics.

The ELPA-SINE features a front panel memory which can store 150 operation states or testing steps. Each state can store or recall the load status and level for the electronic load simultaneously. A sequencing function means that stored settings can be implemented against time, enabling the unit to carry out complex test routines without the need for a computer interface.

LAN Interface

A remote control LAN interface is provided on the rear panel. Commands are detailed in the manual. Other interfaces such as RS-232, GPIB and USB may be available on request. Please contact ETPS if you have a particular preference.

Analogue Interface

The ELPA-SINE has an analogue programming input available on the rear panel of the load. The analogue programming input enables the load module to track and load according to an external 0-10V signal applied to the analogue terminal. The ELPA-SINE will attempt to load proportionally according to the signal and the load’s maximum current or power range.

A host of protection features guard the unit against over power, voltage, current and temperature.

The electronic load is delivered mounted in a flight case with locking castors. Door hangers are also fitted for convenience.

If you are looking to purchase a system up to 180kW, new ELPA-SINE units can be found in our AC electronic load range.

Adjustable frequency is possible from 40-440Hz, making the units ideal for testing aerospace power sources. The ability to also sink DC sources helps to ensure that the ELPA-SINE is the perfect all-round lab kit.

Special UPS Waveform Applications

Many UPSs feature a modified sinewave which is designed to alternate load current on and off in order to simulate a sinewave. This is designed to create a waveform of 1ms on and 1ms off at 50Hz or 60Hz. This is typically a lower cost approach than producing a pure sinewave. The ELPA-SINE can be used to demand this type of waveform from the DUT. The plot shows a 110V/60Hz waveform in constant current mode set at 5A (Yellow CH1=Voltage; Blue CH2 = Current).

Current Protection Component Test

The ELPA-SINE provides a special fuse test function for the verification of current protection components (e.g. fuses, circuit breakers, PTC resettable fuses). This can test and verify protection devices using the rated current and power of the device under test. There are 2 types of fuse test, Trip (fuse) and Non-Trip (no fuse). Fuse test setting parameters include test current, test time and number of test repeats.

Inrush and Surge Current Testing

When applying AC power to a rectifier capacitor input circuit of a load, there is an inrush of current which decays. The ELPA-SINE’s inrush mode is unique in that the load does not need to sync up to the AC input voltage before applying current. A typical decaying inrush current when applying AC power to a rectifier capacitor input circuit of a load is shown below.