HP Integrity rx7620 Server - User Service Guide, Sixth Edition

Figure 4-5 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 HP Integrity rx7620
Server.
AC Voltage Check (Additional Procedure)
This AC 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, see the 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 on the HP website at http://www.hp.com/
racksolutions.
1. Verify that site power is OFF.
2. Open the site circuit breakers.
3. Verify that the receptacle ground connector is connected to ground. For connector details,
see Figure 4-6.
4. Set the site power circuit breaker to ON.
AC Voltage Check (Additional Procedure) 59