Operating the Liebert STS2 LED Display

14.1.2LED and Push Button Description

The following table defines the LEDs and push buttons in the LED display:

Table 15 LED and push button description

Symbol

LED

Description

Action

 

 

 

 

 

 

 

A green LED is lit if the Source 1 input power is present. This LED

A

Green

Source 1 power is present

only indicates that power is present to the power supply; it does not

 

 

 

indicate if the power is within the programmed tolerances of the unit.

 

 

 

A green LED is lit if the Source 2 input power is present. This LED

B

Green

Source 2 power is present

only indicates that power is present to the power supply; it does not

 

 

 

indicate if the power is within the programmed tolerances of the unit.

C

Green

Source 1 within tolerance

A green LED is lit if Source 1 power is within the programmed

tolerance for all phases.

 

 

 

D

Green

Source 2 within tolerance

A green LED is lit if Source 2 power is within the programmed

tolerance for all phases.

 

 

 

E

Green

Source 1 SCRs on

A green LED is lit when the SCRs for Source 1 are closed.

 

 

 

 

F

Green

Source 2 SCRs on

A green LED is lit when the SCRs for Source 2 are closed.

 

 

 

 

 

 

 

A yellow (amber) LED is lit when source transfers are inhibited

G

Yellow

Source transfer inhibited

(locked out) by a hardware condition. Connect a PC terminal to the

Liebert STS2 to locate the exact cause. See 12.0 - Communication

 

 

 

 

 

 

Interfaces for PC terminal commands.

 

 

 

 

H

Green

Push button to select Source 1

A green LED is lit if the button has been pushed to set Source 1 as

as the preferred source

the preferred source.

 

 

I

Green

Push button to select Source 2

A green LED is lit if the button has been pushed to set Source 2 as

as the preferred source

the preferred source.

 

 

J

Green

Output power is present

A green LED is lit to indicate that power is present on the output

load.

 

 

 

 

 

 

Push this button to turn off the horn that is sounded for an alarm.

K

 

Alarm silence button

This button does not reset an alarm condition, unless pushed

 

 

 

simultaneously with “M” button.

 

 

Symbol to indicate the K and M

 

L

 

must be pushed at the same

 

 

 

time to reset alarm

 

 

 

 

Push this button simultaneously with the “K” button to reset an alarm

M

 

Alarm reset push button

condition. An alarm can only be reset if the hardware condition

 

 

 

permits a reset.

 

 

 

A red LED is lit when an alarm condition is present in the Liebert

 

 

 

STS2.

N

Red

Alarm present

Connect a PC terminal to the Liebert STS2 to locate the exact

 

 

 

cause. See 12.0 - Communication Interfaces for PC terminal

 

 

 

commands.

1

Green

CB1 closed

A green LED is lit if CB1 is closed, indicating power is flowing to the

static transfer switch from Source 1.

 

 

 

2

Green

CB2 closed

A green LED is lit if CB2 is closed, indicating power is flowing to the

static transfer switch from Source 2.

 

 

 

3

Green

CB3 closed

A green LED is lit if the output breaker/switch is closed.

 

 

 

 

3A

Green

CB3A closed

A green LED is lit if the output breaker/switch is closed. CB3A is

installed on units with dual output breakers.

 

 

 

4

Yellow

CB4 closed

A yellow LED is lit if the Source 1 bypass breaker/switch is closed.

 

 

 

 

5

Yellow

CB5 closed

A yellow LED is lit if the Source 2 bypass breaker/switch is closed.

 

 

 

 

104

Page 112
Image 112
Liebert 100-1000A user manual LED and Push Button Description, LED and push button description, Description Action