EAC - Electro Automatic Corporation

Transistor linear regulated/Secondary switched
Output power 36W to 400 W
Output power 3...18V, 0...20V, 0...30V
Output current 2A to 20A
Output voltage continuously variable
Current switch off at overload
Illuminated Volt- and Ammeter
Short circuit proof
EMI: EN 50081 part 1, EN 50082 part 1
Safety: EN 60950

The EA-PS 4304 is a secondary switched laboratory power supply providing an adjustable constant voltage of 0...30V DC at 4A output current. Output voltage and current values are indicated by an illuminated meter which can be switched between voltage and current. The unit is protected against short circuits and over heating. The unit is ideal for mobile service applications.

Description
The models EA-3004 and EA-3004-7 are continuously variable between 3...18V. The output current and voltage values are indicated by an illuminated meter which can be switched between voltage and current. Should an overload or short circuit occur then the automatic protection circuit will operate and switch the unit off. The unit can be reset by switching off the mains power for approximately 10 seconds. The power supplies EA-3009, EA-3016 and EA-3033 are continuously variable between 0...20V. The regulation is carried out by two regulation circuits. Output voltage and current are indicated on two separate illuminated meters. Models EA-4003, EA-4013 and EA-4021 are continuously variable between 0...30V. The regulation is carried out by two regulation circuits. Output voltage and current are indicated on two separate illuminated meters.

The EA-4023 is a dual power supply which provides 2 x 0...30V with a maximum constant current of 2,5A. Output voltage and current for each output are indicated on two separate illuminated meters. Both outputs are isolated from one another and can be connected either in series or parallel.

All units, with exception of EA-3004 and EA-3004-7, are fitted with an automatic test circuit which, in the event of an overload or short circuit, periodically checks the output circuit to if the fault condition still exists. If the fault condition is no longer indicated then the unit will automatically switch back on.

In order to prevent high dissipation loss the current switch off level is lower at low output voltage levels. The change over occurs automatically.

Should the unit overheat then it will automatically switch off. When the temperature sinks the unit will be automatically switched back on again.

The scale of the ammeter of all units is divided into three colour zones. These are as follows :

White zone : Normal operation
Yellow zone: Short term operation
Red zone : Electronic fuse range