Figure 41 User Settings Dialog Box - Liebert Static Transfer Switch 2 Installation, Operation & Maintenance Manual

Figure 41 User Settings Dialog Box

Source Set Points
The Source 1/2 Set Points allows you to configure trigger points for each input source (1 or 2) for
the STS2 via a keypad dialog or HI/LO dialog box. The source numbers do not designate the source
as the preferred or alternate source. The numbers simply identify the input source. See Manual
Transfer / Preferred Source Selection on page 59 to set the preferred source.
The Set Points are based on values in relation to the nominal voltage required for the STS2. UV
refers to under voltage, meaning the amount of voltage below the nominal voltage. OV refers to over
voltage, or the amount of voltage over the nominal voltage.
• Fast UV Setting (%) — if the voltage drops below this set percentage of the nominal voltage, the
STS2 transfers from the current source to the opposite source.
• Slow UV Setting (%) — if the voltage remains this set percentage below the nominal voltage for
the period of the slow detection delay, the STS2 transfers from the current source to the oppo-
site source.
• Slow UV detection delay — the number of cycles that the source must remain below the Slow
UV Setting before the STS2 transfers.
• OV Setting (%) — if the voltage exceeds this set percentage of the nominal voltage for the
period of the OV detection delay, the STS2 transfers from the current source to the opposite
source.
• OV Detection Delay — the number of cycles that the source must remain above the OV Setting
before the STS2 transfers sources.
• I-PK Xfer Lockout — if current from the source exceeds this threshold, the STS2 disables
source transfers, and has to be reset either manually or automatically. The type of reset is con-
figured under the User Settings.
To configure the set points for each source:
1. Select SOURCE 1/2 SET POINTS from the User Settings dialog box.
The Source 1/2 Set Points dialog is displayed.
84 STS2 Touch Screen Display