Converting An Mx2000 Router Between Ac And Dc Power - Juniper MX2020 Hardware Manual

Converting an MX2000 Router Between AC and DC Power

WARNING:
the AC or DC circuit. To ensure that all power is off, locate the circuit breaker on the
panel board that services the AC or DC circuit, switch the circuit breaker to the off
position, and tape the switch handle of the circuit breaker in the off position.
NOTE: A system cannot operate with a mix of AC and DC power supplies.
To convert an MX2000 router between AC and DC power, you must completely power off the system,
remove the power distribution modules (PDMs), remove the power supplies, and then adjust the AC/DC
setting as described here.
1. Power off the router. See
Off the DC-Powered MX2000 Router" on page
2. Switch off the dedicated customer-site circuit breakers to the PDMs being removed. Make sure that
the voltage across the power source cord is 0 V and that there is no chance that the cord might become
active during the removal process.
3. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to
one of the ESD points on the chassis.
4. Remove the PDMs. Depending on your configuration, see:
Removing an MX2000 Three-Phase Wye AC Power Distribution Module on page 372
Removing an MX2000 Three-Phase Delta AC Power Distribution Module
Removing an MX2000 Single-Phase AC Power Distribution Module on page 383
Removing an MX2000 Router DC Power Distribution Module (-48 V) on page 390
5. Remove the Power Supply Modules (PSMs). See
on page 412 or "Removing an MX2000 Router DC Power Supply Module (-48 V)" on page
6. Remove the adjustment bar locking screws shown in
driver. There are eight screws per PSM.
Before performing power procedures, ensure that power is removed from
"Powering Off the AC-Powered MX2000 Router" on page 659
660.
"Removing an MX2000 AC Power Supply Module"
Figure 208 on page 434
or "Powering
402.
using a Phillips screw
433