Liebert Static Transfer Switch 2, Installation, Operation & Maintenance Manual

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62 Operating Instructions for the Touch Screen Interface
Figure 35 Gate Board Viewing Slot Locations
If the Color Graphical Display is not available, you can still use the following bypass procedures,
ignore the steps to check the display, and check the LEDs .
If your system contains the LED display, see 14.2.3 - Maintenance Bypass on page 104.
10.4.1 Bypass Procedures for Source 1
To bypass the switch for Source 1:
1. Verify Source 1 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 35 .
2. Remove interlock key from CB5 and place it in the CB4 interlock.
3. Open the alternate source input breaker CB2.
4. Rotate and remove the interlock key.
5. Insert the key in the CB4 bypass breaker interlock.
6. Rotate interlock keys in CB4 bypass breaker interlock to retract interlock.
7. Close bypass breaker CB4.
8. Verify the breaker status on the Mimic screen.
9. Open source input breaker CB1.
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.
NOTE
If you wish to bypass the Source 1 static transfer switch but Source 2 is
presently active, you must first transfer to Source 1. See
Manual Transfer
/ Preferred Source Selection on page 59.
GREEN LEDS ON THE
GATE DRIVER BOARD
ARE VIEWABLE
THROUGH THIS SLOT
INDICATE THAT THE
STS IS ON SOURCE 1
GREEN LEDS ON
THE GATE DRIVER
BOARD ARE VIEW-
ABLE THROUGH
THIS SLOT INDICATE
THAT THE STS IS ON
SOURCE 1
Viewing Slot for
the Source 1 Gate
Drive Board
Touch Screen
GREEN LEDS ON
THE GATE DRIVER
BOARD ARE VIEW-
ABLE THROUGH
THIS SLOT INDI-
CATE THAT THE STS
IS ON SOURCE 2
Viewing Slot for
the Source 2
Gate Drive Board