HP Integrity rx8620 Server User Service Guide

Figure 4-3 Safety Ground Reference Check - Dual Power Source
To verify dual power source safety ground voltage levels, follow these steps:
1. Measure the voltage between A0 and A1. Take the AC voltage down to the lowest scale on
the volt meter. Insert one probe into the ground pin for A0. Insert the other probe into the
ground pin for A1. Verify that the measurement is between 0–5 VAC. If the measurement
is 5 V or greater, escalate the situation. Do not attempt to plug the power cords into the
server cabinet.
2. Measure the voltage between B0 and B1. Take the AC voltage down to the lowest scale on
the volt meter. Insert one probe into the ground pin for B0. Insert the other probe into the
ground pin for B1. Verify that the measurement is between 0–5 VAC. If the measurement
is 5 V or greater, escalate the situation. Do not attempt to plug the power cords into the
server cabinet.
3. Measure the voltage between A0 and B0. Take the AC voltage down to the lowest scale on
the volt meter. Insert one probe into the ground pin for A0. Insert the other probe into the
ground pin for B0. Verify that the measurement is between 0–5 VAC. If the measurement
is 5 V or greater, escalate the situation. Do not attempt to plug the power cords into the
server cabinet.
4. Measure the voltage between A1 and B1. Take the AC voltage down to the lowest scale on
the volt meter. Insert one probe into the ground pin for A1. Insert the other probe into the
ground pin for B1. Verify that the measurement is between 0–5 VAC. If the measurement
is 5 V or greater, escalate the situation. Do not attempt to plug the power cords into the
server cabinet.
Voltage Check (Additional Procedure)
The voltage check ensures that all phases (and neutral, for international systems) are connected
correctly to the cabinet and that the AC input voltage is within limits.
Perform this procedure if the previous voltage check procedure did not yield the expected results
as previously outlined.
Voltage Check (Additional Procedure) 59