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Documentation

T640 PIC Description on page 79•

• Maintaining T640 PICs and PIC Cables on page 454

• Replacing a T640 PIC on page 340

Troubleshooting the T640 Power System

Problem Description:

The following alarms, LEDs, and other conditions indicate a problem with the power

system:

• If all power supplies have failed, the system temperature might have exceeded the

threshold, causing the system to shut down.

• The following indicate a problem on a two-input 160-A DC power supply:

• The DC OK and CB OK LEDs are off.

• If the yellow CB TRIP LED lights but the power supply is not going through a startup

test, the power supply detects a fault (the power supply fails, does not have sufficient

airflow, or is not properly inserted).

• The yellow OVER TEMP LED lights when the power supply is not receiving enough

airflow to maintain proper temperature.

• The following indicate a problem on a three-input 240-A DC power supply or four-input

240-A DC power supply:

• The blue DC OK LED is off.

• If the blue DC OK LED blinks but is not going through a startup test, the power supply

detects a fault (the power supply fails, does not have sufficient airflow, or is not

properly inserted).

• The yellow OVER TEMP LED lights when the power supply is not receiving enough

airflow to maintain proper temperature.

• The INPUT PRESENT LED is off, indicating that the input is not receiving source DC

power.

• If the INPUT PRESENT LED is lit but the CB ON LED is off, it indicates that the circuit

breaker is off.

• The following indicate a problem on a six-input DC power supply:

• The yellow OVER TEMP LED lights when a power supply is not receiving enough

airflow to maintain proper temperature.

• The green INPUT PRESENT LED for each input on a DC power supply does not light

if the input is not connected or is not receiving source DC power.

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