Operating instructions

64 Operating Instructions for the Touch Screen Interface
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 35.
10.5 Normal System Shutdown
The 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 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 STS2.
10.5.2 Shutdown in Maintenance Bypass Mode
When the Static Transfer Switch 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 STS2.