Lenovo System x3750 M4, Installation And Service Manual

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Statement 34:
CAUTION:
To reduce the risk of electric shock or energy hazards:
• This equipment must be installed by trained service personnel in a
restricted-access location, as defined by the NEC and IEC 60950-1,
First Edition, The Standard for Safety of Information
Technology Equipment.
• Connect the equipment to a properly grounded safety extra low
voltage (SELV) source. A SELV source is a secondary circuit that
is designed so that normal and single fault conditions do not
cause the voltages to exceed a safe level (60 V direct current).
• Incorporate a readily available approved and rated disconnect
device in the field wiring.
• See the specifications in the product documentation for the
required circuit-breaker rating for branch circuit
overcurrent protection.
• Use copper wire conductors only. See the specifications in the
product documentation for the required wire size.
• See the specifications in the product documentation for the
required torque values for the wiring-terminal screws.
To install a 750-watt -48 V to -60 V dc power supply, complete the following steps:
Note: Only trained service technicians, other than Lenovo service technicians, are authorized to install and
remove the 750-watt -48 V to -60 V dc power supply, and make connections to or disconnections from the
750-watt -48 V to -60 V dc power source. Lenovo service technicians are not certified or authorized to install
or remove the 750-watt -48 V to -60 V dc power cable. You are responsible for ensuring that only a trained
service technician install or remove the 750-watt -48 V to -60 V dc power cable.
Step 1. Read the notes at the beginning of this section and read the safety information and installation
guidelines, see “Safety” on page v and “Installation guidelines” on page 38.
Step 2. Turn off the server (see “Turning off the server” on page 23) and all attached peripheral devices.
Disconnect all external cables from the server.
Attention: When you handle static-sensitive devices, take precautions to avoid damage from
static electricity. For details about handling these devices, see “Handling static-sensitive devices”
on page 39.
Step 3. Turn off the circuit breaker(s) for the dc power supplies.
Note: Make sure that you use a circuit breaker that is rated 40 amps.
Step 4. Remove the power-supply filler panel from the power-supply bay where you are installing the
power supply. Save the filler for later use.
Step 5. Touch the static-protective package that contains the power supply to any unpainted metal surface
on the server; then, remove the power supply from the package and place it on a static-protective
surface.
Step 6. Attach the dc power cable to the new power supply. Make sure that the power cable wires are
connected securely to the -48 V, ground, and to the -48 V return terminals (as shown in the
following illustration).
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Lenovo System x3750 M4 Installation and Service Guide