Справочник Пользователя для Liebert POWER PROTECTION STATIC TRANSFER SWITCH

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 10.2 - Manual 

Transfer / Preferred Source Selection 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 opposite 

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 configured 

under the User Settings.