Emerson Static Transfer Switch user manual System Configuration, Specifications, Frequency

Specifications

15.0SPECIFICATIONS

This section provides the specifications for the Liebert STS2.

15.1System Configuration

The Liebert STS2 can be set in several different configurations, according to the model and location. The configuration is set at the factory and does not need to be changed by the customer. These config- urations apply to both units, the Color Graphical Display and an LED Display.

15.1.1Frequency

The Liebert STS2 accepts input frequencies of 50 Hz and 60 Hz. The frequency shall be within

± 0.5Hz of the nominal frequency.

15.1.2Input/Output Voltage

The Liebert STS2 models are available to handle various voltages.

The input voltage must be three-phase AC (3 or 4 wire-plus-ground). The Liebert STS2 is designed to accept an input neutral from each source. The neutral is switched in the 4-pole static transfer switch only.

The voltage shall be within ± 10% of the nominal voltage.

The output voltage shall be three-phase AC (3 or 4 wire-plus-ground). Nominal output voltage shall be same as input voltage.

The following table provides nominal voltages, listed according to frequency.

Table 16 Input/output voltage

60Hz	50 Hz
[L-L/L-N]	[L-L/L-N]
200/115V	200/115V
208/120V	208/120V
220/127V	220/127V
240/139V	240/139V
380/220V	380/220V
400/230V	400/230V
415/240V	415/240V
480/277V
600/346V

15.1.3 System Current Ratings

These ratings are based upon continuous switch current rating. These ratings are for all voltages and frequencies. All units are 100% continuous current rated.

Table 17 System current ratings

Current

100

250

400

600

800

1000

111