Lenovo ThinkSystem SR630 V3 User Manual page 136

S029
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).
Attention:
• Read "Installation Guidelines" on page 51
work safely.
• Prevent exposure to static electricity, which might lead to system halt and loss of data, by keeping static-
sensitive components in their static-protective packages until installation, and handling these devices with
an electrostatic-discharge wrist strap or other grounding systems.
Procedure
ThinkSystem SR630 V3 User Guide
126
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.
and "Safety inspection checklist" on page 52 to ensure that you