Vertiv™ | Liebert® STS2/PDU
™
User Manual | Rev. 6 | 10/2017 81
To return to normal mode:
1. Insert the key in the CB2 breaker interlock.
2. Rotate the key to retract the interlock.
3. Close source input breaker CB2.
4. Verify Source 2 and CB2 breaker status on the Mimic screen.
5. Select the SOURCE 2 button in the SOURCE XFERS menu.
6. Close output breakers CB3 and CB3A (if supplied).
7. Verify CB3 and CB3A breaker status on the Mimic screen.
8. Verify that STS SOURCE 2 and OUTPUT boxes are highlighted on the Mimic screen.
9. Open bypass breaker CB5.
10. Rotate the keys in CB5 interlock to extend the interlock.
11. Remove the proper key from CB5 interlock and insert it into CB1 breaker interlock.
12. Rotate the key to retract the CB1 breaker interlock.
13. Close source input breaker CB1.
14. Verify the STS SOURCE 1 box and CB1 breaker status on the Mimic screen.
• If the Color Graphical Display is not available, check the gate driver board LEDs through the slots in the control panel.
See Figure 60.
10.5 Normal System Shutdown
The Liebert STS2/PDU can be shut down from either the static switch mode or the bypass mode.
10.5.1 Shutdown in Static Transfer Switch Mode
When the Liebert STS2/PDU is operating on static transfer switch mode (not maintenance bypass mode):
1. Turn off the load equipment per manufacturer’s recommendations.
2. Open CB8 or panelboard breakers and mains if supplied
3. Open CB3 to turn off the static switch output.
• Open CB3A if the Liebert STS2/PDU has a redundant output configuration.
4. Open the input switches CB1 and CB2.
5. To completely de-energize the unit, open CB6 and CB7.
10.5.2 Shutdown in Maintenance Bypass Mode
When the Liebert STS2/PDU is operating on bypass:
1. Turn off the load equipment per manufacturer’s recommendations.
2. Open CB8 or panelboard breakers and main if supplied
3. Open the bypass switch (CB4 or CB5) to turn off the static transfer switch output.
4. To completely de-energize the unit, turn open CB6 and CB7.
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