Lenovo ThinkSystem SR850P Maintenance Manual page 106

DANGER
For -48V dc power supply, electrical current from power cords is hazardous.
To avoid a shock hazard:
• To connect or disconnect -48V dc power cords when you need to remove/install redundancy
power supply unit(s).
To Connect:
1. Turn OFF subject dc power source(s) and equipment
(s) that are attached to this product.
2. Install the power supply unit(s) into the system
housing.
3. Attach dc power cord(s) to the product.
• Ensure correct polarity of -48 V dc connections:
RTN is + and -Vin (typical -48 V) dc is -. Earth
ground should be connected very well.
4. Connect dc power cord(s) to subject power source
(s).
5. Turn ON all the power source(s).
S035
CAUTION:
Never remove the cover on a power supply or any part that has this label attached. Hazardous voltage,
current, and energy levels are present inside any component that has this label attached. There are no
serviceable parts inside these components. If you suspect a problem with one of these parts, contact
a service technician.
Following are the types of power supply units compatible to this server and notices to take during
installation. These power supplies are designed for parallel operation. In the event of a power-supply failure,
the redundant power supply continues to power the system. The server supports a maximum of two power
supplies with N+1 redundancy support.
• 750-watt platinum power supply
– Input power 115V or 220V ac
• 1100-watt platinum power supply
– Input power 115V or 220V ac
• 1600-watt platinum power supply
– Input power 115V or 220V ac
Before installing a hot-swap power supply:
1. Read the safety information and installation guidelines (see
Guidelines" on page
ThinkSystem SR850P Maintenance Manual
98
49).
To Disconnect:
1. Disconnect or turn off the subject dc power source(s)
(at the breaker panel) before removing the power
supply unit(s).
2. Remove the subject dc cord(s) and make sure the
wire terminal of power cord(s) is insulated.
3. Unplug the subject power supply unit(s) from the
system housing.
"Safety" on page iii and "Installation