Emerson STS2 manual Less floor space required for maintenance access, True Front-Access Design

For units up to 600 amps, the entire power and control module can be removed as an assembly.

True Front-Access Design

All mechanical and electronic components of the Liebert STS2 are accessible from the front of the unit for installation and service—no side or rear access required.

This gives you several immediate benefits:

Greater freedom in system design. The Liebert STS2 can be placed adjacent to or in back of other equipment. It can also be placed against a wall or partition.

Simplified installation, with ample space for cable connections through top and bottom access plates.

Less floor space required for maintenance access.

Designed for maintainability, with all key components visible and accessible from the front of the unit, without shutting down the connected load.

A separate compartment for option modules provides safe and convenient field access.

True Internal Redundancy

One-Line Diagram

The Liebert STS2 has triple- redundant logic. Each DSP controller is capable of working independently, and each helps monitor the other two. If one malfunctions, the other two lock it out. Each controller has power feeds from both power supplies.

The two power supplies feature true dual-bus power distribution. Both have dual inputs, one from each AC input source. All power connections have diode protection, so that internal or external faults cannot propagate. The result is a rugged, fault-resilient package that is optimized for real- world applications.

Source 1

CB1

K1

K2 K3 CB4

		Source 2
	CB2
	K2
CB3	K1 K3	CB5

System Output

3