Installation guide

Connecting Protective Earth Ground and External Power to the Shelf
Connecting Protective Earth Ground and External Power to the Shelf
Chapter 4
36
Figure 4-2 Earth Ground Lug Detail, Shelf Lower Right Rear
Verifying the Power Supply Output
WARNING Observe all electrical hazard safety procedures when verifying the external power
supply voltages. Failure to comply can result in personal injury.
CAUTION All input power and return wiring should be specified, configure, and installed by a qualified
electrician in order to prevent damage to the equipment.
CAUTION Output voltages from the external power supply must be verified before power leads are
connected to the 14-Slot Shelf PEMs. Failure to verify can damage the Shelf and will require
replacement of affected components.
Measure the output voltage between each output power lead and earth ground on the external power
supplies. The supplied voltage must be between -37 and -72 VDC (Nominal -48V).
See Figure 4-3 for a simplified block diagram of a typical external power supply configuration.
Earth Ground Lugs