Vertiv™ | Liebert® STS2/PDU
™
User Manual | Rev. 6 | 10/2017 103
3. Configure the settings using the keypad or dialog box that is displayed when you touch a button.
4. Select 2 for Source 2.
5. Configure the settings, as described in step 3.
6. Select SAVE to keep the settings for both sources. The Setpoints dialog is closed and the User Settings dialog is
displayed.
7. Select MANUAL MAX XFER PHASE ANGLE. A keypad is displayed.
This setting configures the maximum allowed phase difference between the sources and applies to all manual transfers as
well as any auto retransfer.
a. Configure this setting with a range of +/- 1-30 degrees. The default setting is +/-15 degrees and the resolution is 1 deg.
b. Select OK to save the setting. The setting is now displayed in the adjacent field in the User Settings dialog box.
8. Select FREQUENCY TRIP POINT. A keypad is displayed.
This choice verifies that the source is running at the proper frequency. This choice sets the frequency deviation in the
frequency that triggers the frequency trip point alarm. The frequency deviation setting is the allowable frequency
variation from nominal (60 or 50 Hz) before activating the frequency deviation alarm. The frequency setting applies to
both input sources.
a. Configure this setting with a range of 0.1 – 3.0 Hz. The default setting is 3 and the resolution is 0.1.
b. Select OK to save the setting.
9. Select RETRANSFER DELAY. A keypad is displayed.
With the secondary source being used, this setting sets the length of time the switch waits until attempting to transfer
back to the preferred source.
a. Configure this setting with a range of 1 to 60 seconds. The default setting is three (3) seconds and the resolution is
1second.
b. Select OK to save the setting. The setting is now displayed in the adjacent field in the User Settings dialog box.
10. Select AUDIO LEVEL. A dialog box is displayed with HI and LO settings.
This choice sets the loudness of the horn or beeper that is sounded for audible alarms.
a. Configure this setting with a range of 1–10 (ten). The default setting is 5. The settings have an increment of 1 (one).
b. Select OK to save the setting. The setting is now displayed in the adjacent field in the User Settings dialog box.
You can select TEST to briefly sound the alarm to judge its volume.
11. Select DISPLAY BRIGHTNESS. A dialog box is displayed with HI and LO settings.
This choice sets the brightness for the touchscreen.
a. Configure the Contrast and Brightness settings with a range of 1 – 10 (ten).
b. Select OK to save the settings.
12. Set the AUTO REXFER ENABLE choice. The auto retransfer enable setting determines whether the switch automatically
returns the preferred source after that source is restored.
• Select YES to enable the automatic transfer.
• Select NO to disable the automatic transfer. The setting requires transfers be done manually.
13. Set the AUTO RESTART ENABLE choice. This setting determines whether the Liebert STS2/PDU can be started
automatically when power is restored after it has been lost.
• Select YES to enable the automatic restart.
• Select NO to disable the automatic restart. This settings requires a manual restart of the Liebert STS2/PDU.
Table 18 Setpoint parameters
Button Range Default Comments
Fast UV Setting (%)
-10 to -30% of Nominal
voltage rating
-20% Set in increments of 1%.
Slow UV Setting (%) -5 to -20% -10% Set in increments of 1%.
Slow UV detection delay 1-60 cycles 5 cycles Units: Line Cycle
OV Setting (%) +5% to +20% +10% Set in increments of 1%.
OV Detection Delay 1-255 cycles 3 cycles Units: 1/4 Line Cycle
I-PK Xfer Lockout
0 – 3.0 multiplied by the
unit current rating.
1.5 Times Unit
Current Rating
I-peak xfer lockout detection point.
Units: Amps RMS. Select the HI or LO
buttons to configure your setting.
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