Vertiv Liebert STS2 - Table 20 Standard Settings for Programmable Relays

Vertiv™ | Liebert® STS2/PDU
™
User Manual | Rev. 6 | 10/2017 109
Configuring the Programmable Relay Board Settings
The Liebert STS2/PDU can contain up to two programmable relay boards (PRB) that can trigger an external
device when an event occurs in the Liebert STS2/PDU. For example, if Source 1 fails, an external light flashes.
See 6.1 - Programmable Relay Board for more information on the PRBs.
The programmable relay board dialog box with two options: STANDARD SET and USER DEFINED SET. The
STANDARD SET are the factory-configured settings.
The STANDARD SET for the programmable relay board settings are:
The USER DEFINED SET allows you to assign faults and alarms to each contact on the relay boards.
Utilizing the USER DEFINED SET, you can also select Input Contact Isolators to associate with a programmable
relay.
In addition individual events, three other assignment choices are available:
• SELECT ALL sends a summary event to the selected relay whenever any event occurs. If this setting is selected for a
relay, no other event needs to be assigned for that relay.
• ON SOURCE 1 or ON SOURCE 2 can be assigned to a relay to send a notification when that source is being used by the
load.
Once configured, the Liebert STS2/PDU continuously checks the status of the items defined for each contact
and updates the state of the relay.
Table 20 Standard settings for programmable relays
Relay Setting Definition
1 SOURCE 1 FAIL Source 1 failure
2 SOURCE 2 FAIL Source 2 failure
3 BYPASS CB4 CLOSED Switch (CB4) is closed; Source 1 is bypassed.
4 BYPASS CB5 CLOSED Switch (CB5) is closed; Source 2 is bypassed.
5 TRANSFER INHIBIT A transfer between Source 1 and Source 2 is being restrained.
6 OUT OF SYNC
The phase difference between sources 1 and 2 exceeds the allowable threshold
for transfer.
7EQUIP OVER TEMP
The ambient temperature of the ProductName
exceeds the recommended
threshold for operation.
8 Blank No setting