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14.2
Operations
This section discusses the system turn-on, shut-down and bypass procedures for LED-based STS2.
If your unit has an LCD touch screen, see 10.0 Operating Instructions for the Touch Screen
Interface on page 58 for instructions these procedures.
14.2.1 Normal System Turn-On
NOTE
If your STS2 is connected to a PDU with a Wye configuration, enable the
Wye Output Transformer before starting the system. This configuration can
be done from a PC terminal. Refer to 12.1 Using the RS-232 Port on
page 70 for instructions.
This section provides instructions to turn on your STS2. The LEDs provide the basic information
required to ensure proper operation. To monitor metering data, use a PC terminal.
1. Ensure that all STS2 breakers—CB1, CB2, CB3A (if supplied), CB3, CB4, and CB5—are in the
OFF (open) position.
a. Ensure that the key interlocks for CB1 and CB2 have their bolts retracted.
b. Ensure that the key interlocks for CB4 and CB5 have their bolts extended, thus preventing
CB4 or CB5 from being turned ON.
c.
Ensure that the circuit breakers respective LEDs are off.
2. Source/input power should be applied to both STS2 inputs.
Check that the green LEDs for each source are lit.
3. Verify that nominal input voltages are applied to both inputs (Source 1 and Source 2).
Check that the green LEDs monitoring the sources are lit indicating the sources are within
acceptable tolerances.
NOTE
For redundant output switch units, CB3 descriptions apply to CB3 and CB3A.
4. Close CB1.
The green LED monitoring CB1 turns on.
5. Close CB2.
The green LED for CB2 turns on.
6. Verify that the preferred source LED (green) (LED_PREFx) is lit for the source that you want
the switch to be using.
7. Verify that the green LED for the corresponding SCR (STS1 or STS2) is lit, indicating that the
SCR is closed.
8. Close Output Breaker CB3 (and CB3A in a redundant output configuration).
9. Verify the CB3 LED is lit, indicating that CB3 is closed and the output and load are energized.
• In a redundant output configuration, verify the CB3A LED is lit, indicating that CB3A is
closed and the output and load are energized
10. Press the Reset and Silence buttons simultaneously to reset any previous alarms.
11. Verify that no red or yellow (amber) LEDs are lit indicating an active alarm, transfer is
inhibited or a bypass circuit breaker is closed.
If the alarm LED remains lit, check the PC terminal to identify the alarm. Refer to 11.0
Alarm and Faults on page 65 for a description of the alarms and possible causes. All active
alarm conditions should be corrected before proceeding.
12. Turn on the load equipment following the load equipment manufacturer's recommendations.
Operating the LED Display STS2
103
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