Operating instructions

92 STS2 Touch Screen Display
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 static transfer switch continuously checks the status of the items defined for
each contact and updates the state of the relay.
To configure your programmable relay boards for user defined settings:
1. Select PROG. RELAY BOARD # x from the Comm Options dialog box, where x is the
corresponding board number.
The Prog. Relay Board dialog box is displayed.
Figure 46 Programmable Relay Board Dialog Box
Table 15 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 (CB 5) 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,
7 EQUIP OVER TEMP The ambient temperature of the STS2
exceeds the
recommended threshold for operation.
8 blank No setting.