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78
PRELIMINARY
3 Communication (continued)
3.3 Upgrading Firmware for the System Board (continued)
To upgrade the system’s fi rmware:
a) Confi rm that the Main Input Breaker (Q1) and Output Breaker (Q4) are both OFF, and that Bypass Input Breaker (Q2) and Manual Bypass
Breaker (Q3) are both ON (Figure 3.3b).
Fig 3.3b
Q4 Q3 Q2 Q1
Q1: Input Circuit Breaker
Q2: Bypass Input Circuit Breaker
Q3: Manual Bypass Circuit Breaker
Q4: Output Circuit Breaker
Output
Manual
Bypass
Bypass
Input
Main
Input