Vertiv Liebert STS2/PDU - Grounding

Vertiv™ | Liebert
®
STS2
™
100-1000A, 50/60Hz User Manual | Rev. 12 | 11/2017 107
15.1.4 Grounding
Refer to 5.2 - System Grounding for specifications and instructions regarding grounding.
15.1.5 Electrical Requirements
Refer to submittal drawings PS214000 - PS214004 for unit short circuit withstand ratings and cable sizes.
15.1.6 Input 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.
15.1.7 Response 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 86 for instructions on configuring these settings.
15.1.8 Environmental Requirements
See 3.0 - Location Considerations for details concerning environmental requirements for the Liebert STS2.
Table 15 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
Overload Capability
125% for 30 minutes 100A-400A
125% for 10 minutes 600A-1000A
150% for 2 minutes
500% for 0.25 sec.