Inside a Power Distribution Unit

Inside a Power Distribution Unit
Inside a Power Distribution Unit
Highlights of Conversion, Conditioning, Control, and Monitoring Features in PDUs
Twist Lock
J13
Return
J1 (CB10)
120/208 Vac 3Ph Wye
30 amps / phase 50-60 Hz
J8 (CB4)
The application depicted in this illustration is hypothetical. The non-Marway
products and components depicted are intended to be generic, and do not
specifically represent any particular manufacturer or product model. The
Marway products shown are also not intended to represent specific models.
© 2015, Marway Power Solutions.
This illustration may not be copied in whole or in part without express written permission.
J12
J10 (CB6–CB9)
J9 (CB5)
To facilitate the on/off control of high voltages or currents,
the switching signal can be used to trigger a relay of
compatible capacity. For example, a networked board can use
small pilot relays to open and close contactors which deliver
high-energy three-phase power.
Control signals can provide
remote enable/disable of
outlets, and incorporate an EPO
circuit. Marway’s Commander
remote EPO panels utilize a
standardized control bus to
provide these features on PDUs.
Using the remote on/off/EPO
circuit, even multiple PDUs can
be controlled in unison.
EMI Filters
Breakers
Switches
Meters
Ethernet
Power Supplies
and Inverters
Transformers
EMI Filters
Used to convert one ac voltage to
another, a transformer can be used to
generate a lower or higher voltage for
outlets, or a low voltage source for local
and remote control signals.
Transformers can also be used to
isolate the power in the PDU from the
facility. For example, a 240 Vac inlet can
run through a transformer which also
outputs 240 Vac. While the voltage is
the same, the transformer eliminates a
number of signal imperfections, thereby
conditioning the power signal. Isolation
also provides safety advantages, and
can be used to change power form.
Modern electronic equipment requires clean,
stable power, free of noise, in order to
perform reliably. Most facilities have
imperfections in their power signals which
can cause poor performance, incorrect
functionality, or even damage. Some
equipment connected to the PDU may be
sensitive to electromagnetic interference
(”noise”) on the incoming power signal. This
noise can be induced by local equipment, or
from other equipment in the facility.
EMI filters help minimize EMI influences,
and prevent EMI-induced behavior problems.
Specific filters can provide general purpose
protection, or be selected for specific
conditions known to be a problem.
Using power supplies, we can
create dc voltage from an ac input
source. Dc can be used for internal
controls, and for power distribution
as well. In fact, we can even make
more than one dc voltage to suit
multiple needs from the same PDU.
Inverters create ac power from dc
sources. Certain environments may
have only dc as a facility power
source. An inverter creates the ac
needed to power conventional
equipment connected to, or
components in, the PDU.
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Remote On/Off
As part of the remote on/off/EPO system,
manual control at the PDU panel allows
an operator to determine whether the PDU
is controlled remotely or locally. Local-only
control provides a safer condition for
operators working on the equipment
attached to the PDU.
30
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12
SPS
T
J14
Enable
Inlet
208 Vac 3Ph Delta
30 amps / phase 50-60 Hz
Suppression
SPS
T
Serial
J11
Inverter
SPS
T
Ethernet
J4 (CB2)
J7 (CB3)
Converter
Surge suppression is one of the power
conditioning technologies. It is used to
suppress or divert short spikes of
excessive voltage on incoming power
lines. These spikes are induced by static
discharges, lightning, and even upstream
equipment on the same lines.
Remote EPO
Disable
J6 (CB3)
DC Power
Surge Suppression
UCP Control Bus
J5 (CB3)
Pwr Supplies
Transformers
S PS
T
J3 (CB2)
AC Power
SPS
T
J2 (CB2)
Connectors
S PS
T
With Marway’s ability to create application-specific PDUs,
the PDU becomes an ideal place to consolidate many
power management needs of electrical platforms. This
includes converting available power to other forms,
conditioning incoming power to minimize noise, adding
controls for safety and convenience, and integrating
monitoring to display power quality and status.
Power conversion technologies allow us to use one
power form to create one or more others from it.
Whatever your facility doesn’t provide at the wall,
we can create it from whatever is available.
Most facilities have imperfections in their
power signals which can cause performance
Connectors
problems, or even damage. Marway can integrate
For power, control, RF, and other
conditioning needs into the PDU using EMI filters,
signals, if a connector exists, we can
transformers, varistors, and other features to
use it. Power connectors most often
assure a clean and stable power signal to all
fall into the standardized NEMA and
IEC types, though we use several
connected equipment.
other specialty types.
Control capabilities in PDUs offer a range of
Signal connectors are quite varied
from
plastic snap fit types to rugged
options including switches, breakers, remote
Mil-Spec circular connectors.
signals across Ethernet, and even automated
Regardless of the signal type, the
switching between power sources. Consolidating
selection of any given connector is
usually driven by compatibility with
power control features into the PDU can help
the equipment being connected to.
reduce the overall size, complexity, and cost of
power distribution.
Power monitoring with digital displays and
status indicators provide confidence that
downstream equipment is getting what it needs.
Outlet Switching
This might include tracking of power quality,
Outlets can be switched on/off in a
available capacity, and simple on/off status of
number of ways. The simplest is manual
control directly from the PDU using panelcircuits or outlets.
mounted switches. Manual operation can
Marway’s ability to integrate power conversion,
also be acheived from remote locations
using discrete signals or network protocol
conditioning, control, and monitoring
commands over Ethernet using a web
technologies, and select perfectly matched
browser interface.
components for the job allows for optimization
Once remote signals have been added, then automation of
outlet control is also possible. Optima’s RCM Software option
not possible with separate third-party products.
provides on/off control of any “outlet” whether that be a
The result is a solution balanced for space,
traditional 5-15R or C13 outlet, a 3-phase twist-lock, specific
pins of a MIL connector, or even screw terminals.
weight, performance, and cost.
Circular/MIL
SPS
T
IEC
NEMA
SPS
T
The Technologies of
Power Distribution
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Indicators
As simple as they are, an
indicator can provide an
operator with key status
information very quickly.
Size, color, and even
replaceable lamps are
common options. After
that, uniformity with existing
equipment often dictates
specific style selections.
Meters
Meters for voltage, current, and power quality monitoring can provide
the assurance that current capacities are within limits, and that power
quality is meeting equipment needs. Digital meters pack a lot of functionality
into a small space, but analog meters can often provide a faster assessment
of “good/bad” limits. If remote monitoring or factory automation integration is
required, there are several meters which offer connectivity using a variety of
standard industrial protocols.
Circuit Breakers
Breakers can be used to protect the PDU as a whole,
individual power branches, or even each individual
outlet. There are a variety of technologies (thermal,
hydraulic magnetic, etc.), a variety of form factors,
different certifications (UL 1077, UL 489), as well as
other characteristics. You can count on Marway to
select the best fit for the application.
1721 S. Grand Ave., Santa Ana, CA 92705
800-462-7929 • marway@marway.com
www.marway.com
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