Marway Optima 520 Series User manual

Optima™520 Series
Power Distribution Units
Operating Guide and Reference
Apr 2021 : P/N 501021-000 Rev B

Page 2
Optima 520 Series
1General 3
1.1 Documentation Symbols........................................................ 3
1.2 Safety Notices......................................................................... 3
1.3 General Description ............................................................... 4
1.4 Product Models & Ratings ..................................................... 4
2Installation 6
2.1 Installation Notes.................................................................... 6
3Operation 7
3.1 Startup .................................................................................... 7
3.2 Breaker Controls..................................................................... 7
3.2.1 Main Breaker................................................................... 7
3.2.2 Branches.......................................................................... 7
3.2.3 Controls Breaker ............................................................. 9
3.3 Remote Switching / EPO Option............................................ 9
3.3.1 Remote Mode Switch ...................................................... 9
3.3.2 Remote Bus Connectors...............................................10
3.4 Outlet Sequencing Option.................................................... 10
3.5 Digital Power Meter Option.................................................. 11
3.6 EMI Filter Option...................................................................11
4Reference 12
5 Specications 13

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Optima 520 Series
1 General
1.1 Documentation Symbols
Safety and warning notices as well as general notices in this document are shown in a box with a symbol as follows:
Symbol for a life threatening danger.
Symbol for general safety notices (instructions and damage protection bans) or important
information for operation.
Symbol for general notices.
1.2 Safety Notices
Mortal danger - Hazardous voltage
• This product is classied as pluggable equipment. The mains inlet plug serves as the disconnect
device. The mains inlet plug shall be installed so that it is easily accessible.
• This product is equipped with a safety ground connection through the mains inlet plug, as well as
a redundant chassis ground screw on the rear panel. Ensure that the product is properly grounded
before applying power.
• Disconnect all power to the product prior to servicing control signal cabling.
• Do not open this product as it contains no user serviceable parts inside. All service concerns
should be directed to Marway Power Solutions.
• If this product is used in a manner which does not comply with this instruction manual, the
protection provided by the equipment may be impaired.
• All work on connections must be carried out under zero voltage (output disconnect), and may only
be performed by qualied and informed persons. Improper actions can cause fatal injury as well as
serious material damage.
• This product is intended for indoor use only and should not be exposed to excess moisture. Avoid
any use of liquids near the equipment, and condition which cause condensation.
• This product is intended for installation in a restricted access location by a skilled person.
• This product is intended for use by an instructed person.
• The equipment is only approved for use within the connection limits stated on the product label.
• The ratings for all output receptacles are marked on the chassis. Be sure to observe the ratings for
all connected load equipment.

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Optima 520 Series
1.3 General Description
The Optima 520 Series (model numbers MPD 520XXX) is a family of 96 power distribution units (PDUs) designed for use
with a single-phase supply power of either 120 Vac, 110–240 Vac, or 200–240 Vac.
Each PDU receives mains power through an inlet located at the rear. Power is distributed to all outlets on one or two
branches depending on the model. A variety of inlet and outlet connectors is available.
All models include a circuit breaker, indicator, surge suppression. Additionally, four options in a variety of combinations
are available including an integral EMI lter, a remote-switching/remote-EPO control bus, a multi-function power meter,
and delayed on sequencing of two outlet groups.
All models are constructed of a steel chassis, and designed for xed mounting within a 1U rack space in an EIA-310
compliant rack enclosure.
1.4 Product Models &Ratings
Models are primarily organized by what type of power inlet they have. Then by the outlet congurations. All models have
two outlets on the front panel, and ten outlets on the rear panel. Marway’s Standard Products Catalog includes more
detailed tables with exact model number congurations with inlets, outlets, and options identied.
Group Models* Mains Inlet Inlet Rating Outlets Outlet Ratings
Group 1
MPD 520001
through
MPD 520012
NEMA 5-15P
120 Vac, 50/60 Hz
12 A continuous
(15 A maximum)
NEMA 5-15R • 12 A per outlet (15 A max)
• 12 A unit total (15 A max)
Group 2
MPD 520013
through
MPD 520024
NEMA 5-20P
120 Vac, 50/60 Hz
16 A continuous
(20 A maximum)
NEMA 5-20R • 16 A per outlet (20 A max)
• 16 A unit total (20 A max)
Group 3
MPD 520025
through
MPD 520036
NEMA L5-20P
120 Vac, 50/60 Hz
16 A continuous
(20 A maximum)
NEMA 5-20R • 16 A per outlet (20 A max)
• 16 A unit total (20 A max)
Group 4
MPD 520037
through
MPD 520048
NEMA L6-20P
200–240 Vac, 50/60 Hz
16 A continuous
(20 A maximum)
IEC C13 • 10 A per outlet maximum
• 16 A unit total (20 A max)
Group 5
MPD 520049
through
MPD 520060
IEC C20 110–240 Vac, 50/60 Hz
16 A maximum IEC C13 • 10 A per outlet maximum • 16 A unit total
Continued next page.

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Optima 520 Series
Group Models* Mains Inlet Inlet Rating Outlets Outlet Ratings
Group 6
MPD 520061
through
MPD 520072
NEMA L5-30P
120 Vac, 50/60 Hz
24 A continuous
(30 A maximum)
NEMA 5-15R
• 12 A per outlet (15 A max)
• 12 A total across Group B
plus Group A Front
• 12 A total across Group C
plus Group A Rear
• 24 A unit total (30 A max)
Group 7
MPD 520073
through
MPD 520084
NEMA L5-30P
120 Vac, 50/60 Hz
242 A continuous
(30 A maximum)
NEMA 5-20R
• 16 A per outlet (20 A max)
• 16 A total across Group B
plus Group A Front
• 16 A total across Group C
plus Group A Rear
• 24 A unit total (30 A max)
Group 8
MPD 520085
through
MPD 520096
NEMA L6-30P
200–240 Vac, 50/60 Hz
24 A continuous
(30 A maximum)
IEC C13
• 10 A per outlet maximum
• 12 A total across Group B
plus Group A Front
• 12 A total across Group C
plus Group A Rear
• 24 A unit total (30 A max)
* Each model has one of two “dash number” designators:
• –000 = the remote EPO is a Normally Open (N.O.) type
• –001 = the remote EPO is a Normally Closed (N.C.) type

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Optima 520 Series
2 Installation
2.1 Installation Notes
The following guidance must be followed for proper installation of the product.
1. Mounting: This product is designed for mounting in an EIA-310 compliant 19” rack. The user is responsible for
ensuring the mounting method provides adequate structural support for the product, and any attached cables.
The user is also responsible for ensuring the mounting location provides adequate ventilation to dissipate heat
generated during operation of the product. Ensure the product is securely mounted before applying power.
2. Chassis ground: The rear of the chassis includes a redundant chassis ground screw and ground wire. If desired for
your installation location, connect the chassis ground wire to the rack cabinet using an appropriate fastener.
3. Optionally, connect the appropriate cables between the PDU outlets and the equipment being powered by the PDU.
This may be done later according to the startup procedures suitable to the end-user’s equipment and application.
4. If applicable, connect the cabling between the PDU and remote EPO control panel.
5. PDU Main Breaker: Ensure the Main Breaker on the front of the PDU is in the off position before connecting the
PDU’s inlet cable to the facility power source. (It is best to switch all breakers to the off position.)
6. Facility Power Source: The single-phase facility power source for this product must include an overcurrent protective
device capacity as dened in the table below:
Main Inlet Continuous Current
Rating
Mains Protection
Required
NEMA 5-15P 12 A 15 A
NEMA 5-20P 16 A 20 A
NEMA L5-20P 16 A 20 A
NEMA L6-20P 16 A 20 A
IEC C20 16 A 20 A
NEMA L5-30P 24 A 30 A
NEMA L6-30P 24 A 30 A
Some Optima 520 units can be heavy. The ange mounting ears are designed to hold the PDU
securely against the rack mounting rails, but are NOT designed to support the weight of the PDU
vertically. The end user is responsible for ensuring the PDU’s weight is properly supported by the
rack’s infrastructure (which may involve adding support rails).

Page 7
Optima 520 Series
3 Operation
PoweredBreaker
Outlet Control Bus
Enable
Disable
Return
Optima Main Breaker
Main Power
On
Switched OutletsControls
OFFON
PRESS
RESET
Local/On
Off
Remote
VOLTS AMPS WATTS PF
SEL
Rear Panel • Left Side
E
D
R
3.1 Startup
Switch the breaker on the PDU control panel to the off position. If the unit is so equipped, switch the Switched Outlets
mode switch to the up position labeled Local/On. (This forces the PDU into local mode, ignoring any existing remote
panel for now.)
Insert the PDU’s inlet connector into the facility mains power source. If there is a facility power disconnect, switch that to
the On position. At this point, the PDU is energized, though the indicator lamp will be off.
Switch the PDU’s Main Breaker to the On position, and the indicator will be lit. All outlets are now powered.
If the PDU has the Switched Outlets toggle switch, and if there is not an EPO panel connected to the PDU, leave the
switch in the up Local/On position. If there is remote EPO panel connected to the PDU, such as Marway’s Commander
UCP 5000, ip the switch to the down Remote position. This system is discussed in detail farther down.
3.2 Breaker Controls
3.2.1 Main Breaker
The Main Breaker enables/disables power to all PDU outlets. When Main Breaker is switched on, the Main Power
indicator labeled will be lit. If the PDU is equipped with the Switched Outlets mode switch, the Off position will
disconnect power from the outlets even if the main breaker is on.
3.2.2 Branches
All models use a 2-pole main breaker. However, that breaker is used a couple of different ways across the product line.
The following descriptions should help to explain the ratings table above.
12/15 A Rated Units (Group 1)
All models with a 12/15 A inlet rating have both line and neutral connected to the breaker. All outlets are on a single
branch. Therefore, the total continuous load for the whole PDU is 12 Amps. With 5-15R outlets, any one outlet can carry
a continuous load up to 12 Amps (with no draw on other outlets), or a combination of outlets can draw a total of up to 12
Amps for the whole PDU.
16/20 A Rated Units (Groups 2, 3, 4, 5)
All models with a 16/20 A inlet rating have both line and neutral connected to the breaker. All outlets are on a single
branch. Therefore, the total continuous load for the whole PDU is 16 Amps.

Page 8
Optima 520 Series
For units with 5-20R outlets, any one outlet can carry a continuous load up to 16 Amps (with no draw on other outlets), or
a combination of outlets can draw a total of up to 16 Amps.
For units with C13 outlets, any one outlet can carry a continuous load up to 10 Amps (with no draw on other outlets), or a
combination of outlets can draw a total of up to 16 Amps.
24/30 A Rated Units (Groups 6, 7, 8)
All models with a 24/30 A inlet rating use the two breaker poles to power the line of two branches. Outlets are divided
between the two branches to provide greater total capacity. The total continuous load for all these models is 24 amps for
the whole PDU.
The two branches are mapped as follows:
• Branch 1 — outlet Group B, plus the front outlets of Group A
• Branch 2 — outlet Group C, plus the rear outlets of Group A
Group A
Optima Main Breaker
Main Power
On
OFFON
Group C
Group B
Group A
Group A
Optima Main Breaker
Main Power
On
OFFON
Group C
Group A
Group B
Branch 1
Branch 2
Branch 2
Branch 1
For Group 6 units with 5-15R outlets, each breaker branch is rated for 12/15 A. Any one outlet can carry a continuous
load up to 12 Amps (with no draw on other outlets), or a combination of outlets on one branch can draw a total of up to
12 Amps. The total for the whole PDU is 24 amps (the rating of the inlet connector, which happens to coincide withe the
sum of the branches).
For Group 7 units with 5-20R outlets, each breaker branch is rated for 16/20 A. Any one outlet can carry a continuous
load up to 16 Amps (with no draw on other outlets), or a combination of outlets on one branch can draw a total of up to 16
Amps. The total for the whole PDU is 24 amps (not 32!) which is the rating limit of the inlet connector.
For Group 8 units with C13 outlets, each breaker branch is rated for 12/15 A. Any one outlet can carry a continuous load
up to 10 Amps (with no draw on other outlets), or a combination of outlets on one branch can draw a total of up to 12
Amps. The total for the whole PDU is 24 amps (the rating of the inlet connector, which happens to coincide withe the sum
of the branches).

Page 9
Optima 520 Series
3.2.3 Controls Breaker
There is a small pop-out breaker protecting the control system components. This isn’t used during normal operation. If it
were to pop out, try pressing it back in. If it fails to stay in, there may be failure in one of the controls which is shorted, or
is drawing excessive current. This would likely indicate the need for an RMA repair. Contact Marway support.
3.3 Remote Switching / EPO Option
The Remote Switching / EPO option includes the controls to interface to Marway’s Commander UCP 5000 Remote On/
Off/EPO panels and similar compatible panels. This panel is not required to operate the PDU. Refer to Marway’s Standard
Products Catalog for a list of the specic models which include this option.
PoweredBreaker
Outlet Control Bus
Enable
Disable
Return
Optima Main Breaker
Main Power
On
Switched OutletsControls
OFFON
PRESS
RESET
Local/On
Off
Remote
3.3.1 Remote Mode Switch
The Outlet Control Bus has a three-mode switch which is used as a local override to the overall remote command
system. The three modes are labeled Local/On, Off, and Remote.
When there is not a remote control panel connected:
• Local/On (up position) is the normal operating mode.
• Off (center position) causes an internal contactor to disengage power from all Group B and Groups C outlets. Group
A outlets continue to be powered. Therefore, Off disconnects power to almost all outlets even if the main breaker is
switched on.
• Remote (up position) will behave like Off.
When there is a remote panel connected to the PDU:
• Remote (down position) is the normal operating mode. Outlets are subject to the main breaker, and the upstream
remote panel On/Off/EPO controls.
• Local/On (up position) causes the PDU to ignore the On/Off/EPO commands of the remote panel. The main breaker
will then be in sole control of the outlets.
• Off (center position) causes an internal contactor to disengage power from all Group B and Groups C outlets. Group A
outlets continue to be powered. The PDU will ignore the On/Off/EPO commands of the remote panel. Therefore, Off
disconnects power to almost all outlets even if the main breaker is switched on.
If there will not be a remote On/Off/EPO panel connected to the PDU, switch the Outlet Control
Bus mode switch to the up position labeled Local/On. This is the normal operating position for any
unit with no remote panel. (The other positions will prevent power from getting to the outlets.)
Whether there is a remote control panel connected or not, toggling the Outlet Control Bus mode
switch to the center position labeled Off will disconnect power to Group B and Group C outlets.
Group A outlets will continue to be powered.

Page 10
Optima 520 Series
3.3.2 Remote Bus Connectors
There are a total of three remote bus connectors two at the front, and one at the rear. All connectors are wired in parallel.
Multiple PDUs can be wired in a daisy-chain fashion to be operated by a single remote panel. It does not matter which
connectors are used for “in” vs. “out” purposes.
PoweredBreaker
Outlet Control Bus
Enable
Disable
Return
Optima Main Breaker
Main Power
On
Switched OutletsControls
OFFON
PRESS
RESET
Local/On
Off
Remote
VOLTS AMPS WATTS PF
SEL
Group A
PoweredBreaker
Outlet Control Bus
Enable
Disable
Return
Optima Main Breaker
Main Power
On
Switched OutletsControls
OFFON
PRESS
RESET
Local/On
Off
Remote
VOLTS AMPS WATTS PF
SEL
Group A
PoweredBreaker
Outlet Control Bus
Enable
Disable
Return
Optima Main Breaker
Main Power
On
Switched OutletsControls
OFFON
PRESS
RESET
Local/On
Off
Remote
VOLTS AMPS WATTS PF
SEL
Group A
Enable
Disable
Return
Enable
Return
Outlet Control Bus
J1 J2 J4 J5J3
Remote EPO Input Outlet Control Bus
Aux 2
Group C
Group A
Group B
E
D
R
Group C
Group A
Group B
E
D
R
Group C
Group A
Group B
E
D
R
Enable
Disable
Return
Enable
Return
Outlet Control Bus
J1 J2 J4 J5J3
Remote EPO Input Outlet Control Bus
Aux 2
Marway Commander UCP 5000 Remote EPO
3.3.2.1 Remote Bus Connector Wiring
The 3-pin connectors use two low-voltage signals as follows:
• Shorting the Enable pin to the Return pin with a dry contact will trigger the remote bus Enable signal.
• Shorting the Disable pin to the Return pin with a dry contact will trigger the remote bus Disable signal.
• Note that the Disable signal has priority, so that if both signals are triggered at the same time, the net result will be
Disable.
For additional information about Marway’s Commander UCP remote panel, visit the web site at
http://www.marway.com/commander-epo-panels
3.4 Outlet Sequencing Option
The Outlet Sequencing option requires that the remote switching/EPO option be present as well. Note that the remote
option alone does not necessarily include sequencing, but sequencing can be congured at the time of purchase. Refer to
Marway’s Standard Products Catalog for a list of the specic models which include the sequencing option.
With the sequencing option, Group A outlets are powered when the main circuit breaker is turned on, Group B outlets are
powered upon Enable, and Group C outlets are powered about 2 seconds after Group B.