HP 9000 rp8420 Server - User Service Guide, Fifth Edition

4 Cabling and Power Up
After the system has been unpacked and moved into position, it must be connected to a source
of AC power. The AC power must be checked for the proper voltage before the system is powered
up. This chapter describes these activities.
Voltage Check
This section provides voltage check information for use on the customer site. The emphasis is
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, See the section titled “Voltage Check (Additional Procedure)” (page 61).
Voltage Range Verification of Receptacle
This measures the voltage between L1 and L2, L1 to ground, and L2 to ground. Three separate
measurements are performed during this procedure. See Figure 4-1 for voltage reference points
when performing the following measurements.
Figure 4-1 Voltage Reference Points for IEC-320 C19 Plug
IMPORTANT: These measurements must be performed for every power cord that plugs into
the HP 9000 rp8420 server.
1. Measure the voltage between L1 and L2. This is considered to be a phase-to-phase
measurement in North America. In Europe and certain parts of Asia-Pacific, this measurement
is referred to as a phase-to-neutral measurement. The expected voltage should be between
200–240 VAC regardless of the geographic region.
2. Measure the voltage between L1 and ground. In North America, verify this voltage is between
100–120 VAC. In Europe and certain parts of Asia-Pacific, verify this voltage is between
200–240 VAC.
3. Measure the voltage between L2 and ground. In North America, verify this voltage is between
100–120 VAC. In Europe and certain parts of Asia-Pacific, verify this voltage is 0 (zero) VAC.
Table 4-1 provides single-phase voltage measurement examples dependent on the geographic
region where these measurements are taken.
Voltage Check 59