User Service Guide, Fifth Edition - HP Integrity rx8640 SEU

Safety Ground Verification
This measures the voltage level between B0 and A0. The measurement is taken between ground
pins of the two power cords. Refer to Figure 3-20 for ground reference points when performing
this measurement.
Figure 3-20 Safety Ground Reference Check
1. Measure the voltage between B0 and A0. Take the AC voltage down to the lowest scale on
the volt meter.
2. Insert one probe into the ground pin for B0.
3. Insert the other probe into the ground pin for A0.
4. Verify that the measurement is between 0–5V AC. If the measurement is 5V or greater,
escalate the situation. Do not attempt to plug the power cords into the SEU.
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.
This procedure must be performed if the previous voltage check procedure did not yield the
expected results as previously outlined.
NOTE: If a UPS is used, refer to applicable UPS documentation for information to connect the
server and to check the UPS output voltage. UPS User Manual documentation is shipped with
the UPS. Documentation may also be found at the following website:
www.hp.com/go/bizsupport
1. Verify that site power is OFF.
2. Open the site circuit breakers.
3. Verify that the receptacle ground connector is connected to ground. Refer to Figure 3-21 for
connector details.
4. Set the site power circuit breaker to ON.
Cabling and Power Up 59