HP rp8400 Installation Guide, Third Edition - HP rp8400 Server Series - Page 52

Voltage Check

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AC Power Wiring and Voltage Checks Verify the connection of the cabinet ground to site AC power ground through a continuity check between the cabinet and site AC power supply ground. The continuity check should be performed while the site AC power supply circuit breakers serving the cabinet and the cabinet circuit breaker are all set to OFF. Use the following procedure to verify that the cabinet ground connects to the site AC power supply ground: Step 1. Ensure that the site AC power supply circuit breakers serving the cabinet are set to OFF. Step 2. Ensure that the cabinet main circuit breaker is set to OFF. Step 3. Touch one test probe to the site AC power supply ground source. Step 4. Touch the other test probe to an unpainted metal surface of the cabinet. NOTE If the digital multimeter (DMM) leads will not reach from the junction box to the cabinet, use a piece of wire connected to the ground terminal of the junction box. Step 5. Check for continuity indication of less than 0.1 ohm. • If continuity is not found, check to ensure that the DMM test leads are making good contact to unpainted metal and try again. • If continuity is still not found, disconnect the cabinet site AC power immediately and notify the customer of the probability of incorrectly wired AC power to the cabinet. • If continuity is good, and connection of the cabinet to site AC power supply ground (and not floating or connected to a phase) is verified, then voltage checks may be performed. Voltage Check This section provides voltage check information for use on the customer site. The emphasis will focus on measuring the voltages at the power cord plug end specified as an IEC 320 C19 type plug. This is the end that plugs directly into the back of the server cabinet. NOTE These procedures need to be performed for each power cord that will be plugged directly into the back of the server cabinet. If the expected results from this procedure are not observed during the voltage check, please refer to the next section titled "Voltage Check (Additional Procedure)" 52 Chapter 4

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Chapter 4
AC Power
Wiring and Voltage Checks
52
Verify the connection of the cabinet ground to site AC power ground through a continuity check between the
cabinet and site AC power supply ground. The continuity check should be performed while the site AC power
supply circuit breakers serving the cabinet and the cabinet circuit breaker are all set to
OFF
.
Use the following procedure to verify that the cabinet ground connects to the site AC power supply ground:
Step 1.
Ensure that the site AC power supply circuit breakers serving the cabinet are set to
OFF
.
Step 2.
Ensure that the cabinet main circuit breaker is set to
OFF
.
Step 3.
Touch one test probe to the site AC power supply ground source.
Step 4.
Touch the other test probe to an unpainted metal surface of the cabinet.
NOTE
If the digital multimeter (DMM) leads will not reach from the junction box to the
cabinet, use a piece of wire connected to the ground terminal of the junction box.
Step 5.
Check for continuity indication of less than 0.1 ohm.
•
If continuity is
not
found, check to ensure that the DMM test leads are making good contact to
unpainted metal and try again.
•
If continuity is
still
not found, disconnect the cabinet site AC power immediately and notify the
customer of the probability of incorrectly wired AC power to the cabinet.
•
If continuity is good, and connection of the cabinet to site AC power supply ground (and not
floating or connected to a phase) is verified, then voltage checks may be performed.
Voltage Check
This section provides voltage check information for use on the customer site. The emphasis will focus on
measuring the voltages at the power cord plug end specified as an IEC 320 C19 type plug. This is the end that
plugs directly into the back of the server cabinet.
NOTE
These procedures need to be performed for each power cord that will be plugged directly into
the back of the server cabinet. If the expected results from this procedure are not observed
during the voltage check, please refer to the next section titled “Voltage Check (Additional
Procedure)”