Hitachi GR2000 Series Installation Manual page 382

Starting the own router is performed by turning on the power switch or the power
breaker on each router chassis. See Subsection 6.4.2 for the locations and in/out
positions of these power switches and breaker switches. Pay attention to the
following Notes.
Note: When you turn off and turn on the same router power successively,
*
pause at least 2 seconds before you turn on the power.
Note: For a router with duplexed (redundant) power supply, turn on the
*
two power/breaker switches one after the other within 10 seconds.
Note: When turning on a breaker switch, make sure you move the lever
*
switch fully until it stops.