Description

The high flexibility of the instrument makes it adaptable to totally different applications. The models with harmonic analysis allows a permanent based control of one of the most important aspect of the power supply quality.

Such important possibility, up to now, was reserved only to high-cost device.

STAR 3 breaks this price barrier bringing, for the first time, the harmonic analysis into the market of the panel analysers.

Technical specifications

Maximum dimensions (mm): instrument: 96 X 96 X 115.4. Cut-out template: 91 X 91

Power supply: switching circuit from 90V to 230V ±15% AC/DC @  35-400 Hz (5 VA).

Display: reverse red LCD with LED backlight

Voltmeter inputs: VL1, VL2, VL3, N up to 350 V phase-neutral, 600 V phase-to-phase, 35-400 Hz

Voltmeter input impedance: 2 Mohm

Voltage input overload: max 850 V phase-neutral

Current inputs: AL1, AL2, AL3, COM., consumption 1 VA. Three or two 5A external curr.transf. required

Measuring range: 0-120% In

Sensitivity: current 20 mA ; voltage 10 mV

Overcurrent: withstand 50 amps for 1 sec.

Number of scales: 1 voltage scale, 2 current scales

Measurements: True R.M.S. up to 25th harmonic = 1250Hz with fundamental @50 Hz

Sampling frequency: 2.5 kHz.

Accuracy: <0.5% for Voltage and current and Power

Connection: Single phase or three phase star, three phase delta, or diphase systems

Weight: 0.6 Kg

Protection level: instrument IP20, front panel IP40

Temperature range: -10°C to +50°C

Relative humidity range: (R.H.): from 20% to 90%.

Condensation: non condensing.

Measures

Models

It shows all the measures listed in the above table. Includes an RS485 output with multi-protocol capability: Modbus RTU, Modbus IEEE and Modbus ASCII . The importance of the communication and the lower cost of the components allow today the inclusion of the RS485 port as a default features. Even if you are not interested in making a network of instruments, this possibility will always remain available for future developments.

STAR3 ALM:

as the basic model + two relay outputs. The outputs can be set be for either alarms signalling or pulses or remote relay control . The function "alarm" can be associated with several measures including V,A,W,THD and harmonics. Each relay has a maximum and a minimum threshold, the histeresys and the delay time. All the settings can be adjusted. If used in "pulse" mode the relays generates pulses proportional to the associated measures. Also in this case the behaviour is adjustable from the setup menu. In "remote control" the position of the relay is decided by an external master device ( PLC, PC, etc) through the RS485 line . This is very convenient for load shedding applications.

STAR3 4-20mA:

as the basic model + two analogue outputs 4-20 mA or 0-20 mA.

STAR3 HARMO:

as Star3 ALM + three phase harmonics spectrum for voltage and current.

In addition to the basic measures of the above table, the harmonics model displays complete information about the spectrum. For each harmonic order k the voltage and current phase values are available. The accuracy of harmonic measurements is totally independent from the fundamental frequency.

Star3 measures harmonics up to 1250Hz, which corresponds to the 25° order if the fundamental frequency is 50Hz. If the frequency of the fundamental is higher than 50Hz, the number of available harmonic orders is automatically decreased.

SWITCHING POWER SUPPLY 
all models have switching-type power supply. This permits to supply the instrument with an AC or DC voltage in the 90V to 230V range. This  is very useful for particular applications (for example UPS supply) or for reducing the number of products to be kept in stock.