S&C Instruction Sheet 659-520
45
Maintenance
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Verification
• Verify there is no ac voltage from the door bond to the bottom of F1.
• Verify there is no dc voltage from the door bond to the bottom of F1.
• Verify there is no ac voltage from the door bond to the bottom of F2.
• Verify there is no dc voltage from the door bond to the bottom of F2.
• Verify there is no ac voltage from the door bond to the bottom of F4.
• Verify there is no dc voltage from the door bond to the bottom of F4.
• Verify there is no ac voltage from the door bond to the bottom of F5.
• Verify there is no dc voltage from the door bond to the bottom of F5.
• Verify there is no ac voltage from the door bond to the bottom of F6.
• Verify there is no dc voltage from the door bond to the bottom of F6.
• Verify there is no ac voltage from the bottom of F1 to the bottom of F2.
• Verify there is no dc voltage from the bottom of F1 to the bottom of F2.
• Verify there is no ac voltage from the bottom of F4 to the bottom of F5.
• Verify there is no dc voltage from the bottom of F4 to the bottom of F5.
• Verify there is no ac voltage from the bottom of F5 to the bottom of F6.
• Verify there is no dc voltage from the bottom of F5 to the bottom of F6.
• Verify there is no ac voltage from the bottom of F6 to the bottom of F4.
• Verify there is no dc voltage from the bottom of F6 to the bottom of F4.
DANGER
Wait at least 5 minutes after disconnecting power before continuing work . The dc capacitor
bus will go from its maximum voltage to a safe voltage in this timeframe . Waiting this
amount of time will prevent equipment damage, personal injury, or even death .
CAUTION
To inspect the internal components of the PCS enclosure, the dead-front access panels
require careful removal to prevent injury or equipment damage .