Specifications

15.1.4Grounding

Refer to 5.3 - System Grounding for specifications and instructions regarding grounding.

15.1.5Electrical Requirements

Table 18 Electrical requirements

Item

Requirement

 

 

Maximum Continuous Current

100, 250, 400, 600, 800, 1000 amps

 

 

Load Power Factor Range

0.75 to 1.0, leading or lagging

 

 

Load Crest Factor

Up to 3.5

 

 

Source Voltage Distortion

Up to 10% THD with notches and ringing transients

 

 

 

125% for 30 minutes 100A-400A

 

 

Overload Capability

125% for 10 minutes 600A-1000A

 

150% for 2 minutes

 

 

 

 

500% for 0.25 sec.

 

 

Table 19 Unit short circuit withstand capability

Unit Voltage

Unit Amps

Withstand Capability

 

 

 

 

100-250A

125kA

208-240V

 

 

400-600A

150kA

 

 

 

 

800-1000A

100kA

 

 

 

 

100-250A

100kA

380-480V

 

 

400-600A

100kA

 

 

 

 

800-1000A

65kA

 

 

 

 

100-250A

50kA

600V

 

 

400-600A

25kA

 

 

 

 

800-1000A

25kA

 

 

 

15.1.6Input Surge Suppression

The Liebert STS2 is equipped with transient voltage surge suppression on each input for maximum surge suppression. The surge suppression is capable of protecting the Liebert STS2 from operating outside of tolerances due to surges as defined by IEC 1000-4-5 (1.2/50uS surge, 2kV CM and 1kV DM) as required under EN 50091-2.

15.1.7Response Time

A dual level fast/slow transfer threshold is used for under voltage detection to allow the Liebert STS2 to be compatible with UPSs and generators. The voltage thresholds and the slow transfer delay time is user-adjustable. The fast transfer delay time is less than 4 ms.

The over voltage detection uses a single threshold, with programmable level and delay time. See User Settings on page 89 for instructions on configuring these settings.

15.1.8Environmental Requirements

See 3.0 - Location Considerations for details concerning environmental requirements for the Liebert STS2.

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Liebert 100-1000A Grounding, Electrical Requirements, Input Surge Suppression, Response Time, Environmental Requirements