EAC - Electro Automatic Corporation

Power factor correction (PFC)
Input current sinusoidal
Primary switched
19"- 3HE Bench- or Rack version
Remote sense
Output switchable (Stand-by)
Master-Slave-Mode (2,8kW and 9kW)
Short recovery time / High efficiency
Monitor outputs for V & I
Safety: EN 60950
EMI: EN 50081 part 1 and EN 50082 part 1
Systems- and Industry applications
Output power 0,7kW, 1,4kW, 2,8kW & 9kW
Output voltage 12V, 24V, 48V adjustable
Overvoltage protection (OVP)
High regulation accuracy
Low ripple
Analog meters class 2,5
Remote ON/OFF
IEEE-BUS option (2,8kW & 9kW units)

General

These new primary switched laboratory power supplies are particularly designated for all normal and highest laboratory and system applications. The units provide highly stable output voltage and current

Design concept

The units are delivered as 19"-rack- or -bench version. State-of-the Art switched mode technology makes it possible, to reduce the size and the weight as with other linear regulated power supplies.

Meters

The units are equipped with separate analog volt- and ammeters class 2,5.

Voltage- and Current setting

The output values of the voltage and current can be set on the 2,8kW and 9kW units by means of a screw driver on the front panel within the rated range. The units can operate as constant voltage or constant current source

Overload protection - Current regulation

The output is protected against a continuous short circuit. On the 2,8kW and 9kW units the max. output current is continuously adjustable from zero to the rated current.

Overvoltage protection (OVP)

This series is equipped with overvoltage protection that comes standard with every unit. Any value between 3V and 10% over the max. rated voltage can be set with the trimmer OVP on the front.

If the output voltage becomes higher for any reason than the preset voltage (i.e. operators fault, defective components, external voltage), the switching oscillator is blocked, and no further energy comes to the output. The LED „OVP“ lights on.

To reset the OVP to normal, the unit must first be switched off for a few seconds and after switching back on, the unit then is once again operational.

Parallel- & Series connection, Master-Slave-Operation

Two or more power supplies can be connected in series or parallel. In this case one unit will operate as the master unit controlling the others in slave operation.

Output terminals

The main output terminals are located on the rear of the unit. The (+) and (-) output sockets are floating so that either one may be grounded if required.

Over temperature protection (OT)

If the unit overheats (i.e. Fan defective, ventilation in- and outlet dirty etc.) it will be automatically switch off and the LED „OT“ lights on. After cooling the unit will switch on automatically.

Power Factor Correction (PFC)

On standard switch mode power supplies the power factor on the mains input is ca. 0,6 to 0,7. This is the reason of the reactive current on the mains cable. This current is counted on industrial users and must be paid to the power plant.

The Lab-Power-Supplies series EA-PS 9000 are equipped with an active power factor correction circuit to achieve a power factor better than 0,98, so the reactive current becomes to nearly zero and the input current is sine wave shaped. Only actual power is drawn from the mains.

IEEE BUS (Option "IEC"), 2,8 and 9kW units

As an option the units can be equipped with an IEEE BUS interface (EA-PSP 5512 and EA-PSP 5612). The connection terminals are located on the rear of the unit.

Ambient conditions

During operation, at full load or constant operation, the ambient temperature may lie between 0...50°C. The storage temperature can be between -40°C and +70°C. The relative humidity should not exceed 90% non-condensing.

Remote Sense

The remote sense feature can be used to compensate for the voltage loss between the output terminals and the load (max. 0,8V on 12V; 1,6V on 24V; 3,2V on 48V versions on each cable).

In this case the "Sense" input sockets are connected to the load using a small cross section cable. The Sense terminals are on the rear of the unit. The switch over to remote sensing mode is automatically.

Remote adjustment of the output voltage (2,8 & 9kW)

The output voltage can be externally set by means of an external voltage of 0...10V for 0... V0 - Vmax. The terminals for the external programming are on the rear of the unit.