DynaGen AST2225 Manuel d'installation et d'utilisation - Page 4

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1: GENERAL DESCRIPTION

1:1 Switchgear:

The AST2225-3 transfer switch mechanism consists of a basic mechanical switching

assembly that can be configured to satisfy various application requirements. (UL listed

E200939 Switch Mechanism). This manual describes the AST2225-3 model. (General

Arrangement page 14).

1:1:1 Specifications for AST2225-3 model

Transfer Motor: 120V 60 HZ 2.3 amps thermally protected

Withstand/interrupting rating: symmetrical 10 KA. for loading at 100% of nameplate

current. Enclosure: 24" wide x 30" high x 9" deep. NEMA 4.

1:1:2 Operation:

The AST2225-3 includes the suitable sensing circuitry for automatic transfer of an

electrical load to a stand-by power supply in the event of a drop or loss of voltage of any

or all phases of the normal power supply. Upon the restoration of the normal supply, the

electrical load is automatically re-transferred to the normal power supply. The normally

required time delay functions are all included in the Timer Module package.

The transfer motor utilizes power from the source to which the electrical load is being

transferred. The mechanism provides a positive mechanical interlock to prevent both

switches from being closed at the same time. The AST2225-3 also incorporates the basic

actuating motor control switches, terminal blocks, and voltage sensing connection points

for Utility Line sensing. Provision is also made for manual transfer of the power sources

if necessary. Instructions for the manual procedure are located on the operating arm of

the mechanism. The AST2225-3 mechanism is a lever-operated device controlled by a

120 volt unidirectional gear-motor.

Manual for AST2225 Series

Normal/Emergency/Neutral Lug Connections 300

MCM MA Load connections 320 MCM (Max Wire

Size)

VOLTAGE

NORMAL

208/240

Amperage

225

Three

Poles

Automatic

Transfer Switch

EMERGENCY

208/240

225

Three