Vertiv™ | Liebert
®
STS2
™
100-1000A, 50/60Hz User Manual | Rev. 12 | 11/2017 105
To return to normal mode:
1. Verify that the LED’s for Source 2 are On, indicating that the source is supplying power and is operating within acceptable
tolerances.
2. Insert the key in the CB2 breaker interlock.
3. Rotate the key to retract the interlock.
4. Close source input breaker CB2.
Verify that CB2 LED is On.
5. Select the SOURCE 2 button.
6. Close output breakers CB3 and CB3A (if supplied).
Verify that CB3 and CB3A LED’s are On.
7. Verify that STS SOURCE 2 and OUTPUT LED’s are On.
8. Open bypass breaker CB5.
Verify that CB5 LED is Off.
9. Rotate the keys in the CB5 interlock to extend the interlock.
10. Remove the proper key from the CB5 interlock and insert it in the CB1 breaker interlock.
11. Rotate the key to retract the CB1 breaker interlock.
12. Close source input breaker CB1.
Verify that CB1 LED is On.
14.2.4 Normal System Shutdown
The Liebert STS2 can be shut down from either the static switch mode or the bypass mode.
Shutdown in Static Transfer Switch Mode
When the Liebert STS2 is operating in static transfer switch mode (not maintenance bypass mode):
1. Turn Off the load equipment per manufacturer’s recommendations.
2. Open CB3 to turn Off the static switch output.
• Open CB3A if the static transfer switch is a redundant output configuration.
The LED’s for CB3 and CB3A (if supplied) and the output (OUT) are turned Off.
3. Open the input switches CB1 and CB2.
The LED’s for CB1 and CB2 are turned Off.
4. To completely de-energize the unit, turn OFF the power to both inputs to the Liebert STS2.
Shutdown in Maintenance Bypass Mode
When the Liebert STS2 is operating on bypass:
1. Turn Off the load equipment per manufacturer’s recommendations.
2. Open the bypass switch (CB4 or CB5) to turn Off the Liebert STS2 output.
The LED for the bypass switch is turned Off.
The output (OUT) LED is turned Off.
3. To completely de-energize the unit, turn Off the power to both inputs to the Liebert STS2.
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