DM4270 – Installation Guide
Hardware DESCRIPTION
204.4331.03 - October/2019
22
The PSU 400 AC has three-pin IEC 320/C14 plug power terminals.
The PSU 400 power supplies operate in a 1:1 redundancy manner, with only one being
sufficient to maintain full operation of the equipment. The combination of AC and DC
power supplies in the same equipment is allowed. The insertion/removal of power
cables and the PSU 400s can be hot-swapped, allowing the uninterrupted operation of
the equipment, if one of the two power supplies is turned off or presents failures. The
PSU 400 has a PWR LED on its front panel that, when
GREEN
, indicates that it is
correctly powered and operational.
Figure 14 - PSU 400 AC and PSU 400 DC front panel
The equipment is de-energized through its power cable (s). The power
outlet must be nearby and easily accessible.
The electrical installation of the site should be protected by devices
against short circuits.
In the situation in which both PSUs are present and the power inputs are
energized and operating with voltages within the specified range, the AC
power inputs will take precedence over the DC power input, regardless of
the connected slot.
In the situation in which both DC PSUs are present and the power inputs
are energized and operating with voltages within the specified range,
PSU 1 will be supplying power to the equipment and PSU 2 will be on
standby.
