Operating Instructions for the Touch Screen Interface
10.4.2Bypass Procedures for Source 2
To bypass the switch for Source 2:
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.
1.Verify that 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 the CB5 interlock.
3.Open the alternate source input breaker CB1.
4.Rotate and remove the CB1 interlock key.
5.Insert the key in the CB5 bypass breaker interlock.
6.Rotate the 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 CB2 interlock key and remove it to lock out the breaker.
11.Secure the key according to your site’s lockout/tagout procedure.
12.Open output breakers CB3 and CB3A (if supplied) to remove power and isolate the static switch from the load.
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.
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 the CB5 interlock to extend the interlock.
11.Remove the proper key from the CB5 interlock and insert it in the 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 47.
10.5Normal System Shutdown
The Liebert STS2 can be shut down from either the static switch mode or the bypass mode.
10.5.1Shutdown 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
10.5.2Shutdown 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
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