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Operating Instructions for the Touch Screen Interface
70
10.4.2 Bypass Procedures for Source 2
To bypass the switch for Source 2:
1. Verify Source 2 is supplying power via the Mimic.
• If the Color Graphical Display is not available, check the gate driver board LEDs through the
slots in the control panel. See Figure 47.
2. Remove the interlock key from CB4 and place it in CB5 interlock.
3. Open the alternate source input breaker CB1.
4. Rotate and remove the interlock key.
5. Insert the key in the CB5 bypass breaker interlock.
6. Rotate interlock keys in the CB5 bypass breaker interlock to retract the interlock.
7. Close bypass breaker CB5.
8. Verify the breaker status on the Mimic screen.
9. Open source input breaker CB2.
10. Rotate the interlock key and remove it to lockout the breaker.
11. Secure the key, per your site’s lockout/tagout procedure.
12. Open output breakers CB3 and CB3A (if supplied) to remove power from static switch.
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. Close output breakers CB3 and CB3A (if supplied).
6. Verify CB3 and CB3A breaker status and STS SOURCE 2 and OUTPUT boxes are highlighted on
the Mimic screen.
7. Open bypass breaker CB5.
8. Rotate the keys in CB5 interlock to extend the interlock.
9. Remove the proper key from CB5 interlock and insert it into CB1 breaker interlock.
10. Rotate the key to retract the CB1 breaker interlock.
11. Close source input breaker CB1.
12. 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 47.
10.5 Normal System Shutdown
The Liebert STS2 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 is operating on 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 has a redundant output configuration.
3. Open the input switches CB1 and CB2.
4. To completely de-energize the unit, turn OFF power to both inputs to the Liebert STS2.
10.5.2 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 static transfer switch output.
3. To completely de-energize the unit, turn OFF the power to both inputs to the Liebert STS2.
NOTE
To bypass the Source 2 static transfer switch when Source 1 is presently active, you must first
transfer to Source 2. See Manual Transfer / Preferred Source Selection on page 66.