Figure 9, Figure 10, Figure 11 – Dell R510 User Manual
Page 24: 4 back panel view and features

Dell
PowerEdge R510 Technical Guide
24
4.4 Back Panel View and Features
Figure 9. R510 with Non-Redundant Power Supply for PowerEdge R510-4 ONLY
Figure 10. With Redundant Power Supply for PowerEdge R510-8 and 12
Figure 11. Non-redundant Power Supply Option on PowerEdge R510-8 and 12
Only redundant Power Supply Units (PSUs) have a LED indicator to show the power supply status.