Emerson Network Poewr MPH2 User manual

Emerson Network Power®MPH2™ Rack PDU
User Manual

Emerson®MPH2™User Manual i
Table of Content
Important Safety Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 General Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Model Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Appearance and Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3.1 Controls and Indicators—RPC2™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3.2 LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3.3 On-board LCD Controls and Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3.4 Power Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3.4.1 Branch Overcurrent Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.3.5 Hard-Wired Connection Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1 Attaching Input Power Cords—Hard-wired Models Only . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1.1 Attaching Input-power Cords without Conduit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1.2 Attaching Input-power Cords with Conduit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2 Tool-less Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3 Installing a MPH2 in an Emerson®Rack. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.3.1 Mounting Hardware and Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.3.2 Mounting the Vertical MPH2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.3.3 Mounting the Horizontal MPH2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.3.4 Mounting Horizontal MPH2 on Vertical Frame Member with Aluminum Extrusions . . . . . 17
2.3.5 Rack Grounding strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.3.6 Recommended Electrical-backup Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.4 Connecting Rack Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.5 Installing Optional Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.5.1 RPC Basic Display Module Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.5.1.1 Included Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.5.2 Temperature/Humidity Sensor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

ii Emerson®MPH2™User Manual
3.0 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.1 Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.2 View Input-level Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.2.1 Communication Link with RPC2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.3 View MPH2 System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.3.1 System and Screen Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.3.2 Reboot the On-board LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.3.3 Restore System Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.3.4 Determine IP Address, MAC Address and Firmware Version . . . . . . . . . . . . . . . . . . . . . 32
3.3.5 Adjust the Contrast of the On-board LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.3.6 Adjust the Orientation of the On-board LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.4 View Active Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.4.1 Silence an Audible Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.5 View Branch-level Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.6 View Receptacle-level Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3.7 View Sensor Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
3.8 Opening and Closing Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.0 Emerson®MPH2 Rack PDU Specifications. . . . . . . . . . . . . . . . . . . . . . . 41
5.0 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.1 Additional Troubleshooting by Plug Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Emerson®MPH2™User Manual iii
List of Figures
Figure 1-1: Vertical MPH2 Rack PDU Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 1-2: Horizontal MPH2 Rack PDU Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 1-3: MPH2 major monitoring and management features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 1-4: Branch and receptacle identification—Units with no monitoring (Type B models). . . . . . . . . . . . . . . . . 8
Figure 1-5: Branch and receptacle identification—Units with individually-monitored
and managed receptacles (Type C, R and M models). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 1-6: Circuit breaker branch identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 2-1: Disassembly to install an input-power cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 2-2: Re-assembly to install an input power cable in conduit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 2-3: Tool-less mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 2-4: Installing vertical MPH2 in an Emerson rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 2-5: Installing horizontal MPH2 in an Emerson rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 2-6: Installing horizontal MPH2 in a rack with aluminum extrusions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 2-7: Rack grounding-strap connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 2-8: RPC BDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 2-9: Inserting the spring nut into a T-slot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 3-1: On-board LCD and control keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 3-2: Input-level information (main screen) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 3-3: Configuration in-progress wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 3-4: System information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 3-5: System-info and Screen-option icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 3-6: Reboot Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 3-7: Restore Defaults selected on Reboot Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 3-8: Restore Defaults? confirmation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 3-9: IP address, MAC address, and firmware information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 3-10: Adjust LCD contrast. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 3-11: Alarm list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 3-12: Branch information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 3-13: Receptacle list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 3-14: Receptacle information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 3-15: Sensor list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 3-16: Sensor information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 3-17: Turning Off or resetting a circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

iv Emerson®MPH2™User Manual
List of Tables
Table 2-1: Hard-wired models—Connection terminal ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 2-2: Terminal tightening torque. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 2-3: Ground-strap wire gauge by MPH2 rating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 2-4: Upstream circuit breaker rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 3-1: Factory-default settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 5-1: Receptacle LED Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 5-2: Line LED Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 5-3: Active Line LEDs and Branch Voltage Phasing by Plug Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Important Safety Instructions
Emerson®MPH2™User Manual 1
Important Safety Instructions
SAVE THESE INSTRUCTIONS
This safety sheet contains important safety instructions. Read all safety, installation and operating
instructions before installing the Emerson Network Power MPH2 rack power-distribution unit (PDU).
Adhere to all warnings on the unit and in this safety sheet. Follow all instructions.
• The MPH2 Rack PDU is designed for information technology equipment. The MPH2 Rack PDU is not
intended for use with life support or other designated critical devices. If uncertain about its intended
application, consult your local dealer or Emerson representative.
• Maximum load must not exceed the rating shown on the MPH2 Rack PDU nameplate.
• The rated line voltage must not exceed 240VAC for connection to AC power distribution systems with
an isolated or high-impedance ground.
• Operate the MPH2 Rack PDU in an indoor environment only in the appropriate ambient temperature
range:
• 32°F to 140°F (0°C to 60°C) for 24A or less input models.
• 32°F to 122°F (0°C to 50°C) for 40A and 48A input models without case ventilation.
• 32°F to 140°F (0°C to 60°C) for 40A and 48A input models with case ventilation.
• Install the MPH2 Rack PDU in a clean environment, free of conductive contaminants, moisture,
flammable liquids, gases and corrosive substances.
• The MPH2 Rack PDU must be installed in a restricted-access location. A restricted-access location is
an area where access is possible only through the use of a tool or lock and key or other means of
security, and is controlled by the authority responsible for the location.
• The MPH2 Rack PDU has no user-serviceable parts. Under no circumstances attempt to gain internal
access due to the risk of electric shock or burn.
• Refer any unexpected behavior or unusual fault conditions to your local dealer, Emerson
representative or Emerson Network Power Applications Engineering.
• Emerson recommends powering only devices with safety agency approval from the MPH2 Rack PDU.
• For permanently connected MPH2 Rack PDUs (hard-wired versions), a readily accessible disconnect
device must be incorporated external to the equipment.
• For MPH2 Rack PDUs with integral plugs, the socket/ outlet must be installed near the equipment and
must be easily accessible.
!
WARNING
Opening or removing end caps from an MPH2 Rack PDU may expose personnel to lethal voltages
within the rack PDU. Observe all cautions and warnings. Failure to do so may result in serious
injury or death. MPH2 Rack PDU units contain no user-serviceable parts. For service or technical
support, contact Emerson Network Power Applications Engineering or your local Emerson
representative. Do not attempt to service this product yourself.
!
CAUTION
Connecting an MPH2 Rack PDU to a power supply with an incorrect rating in voltage or amperes
may damage the connected equipment and your MPH2 Rack PDU. For questions about the power
supply connections, contact Emerson Network Power Applications Engineering or your local
Emerson representative.
!
CAUTION
Ensure that the ratings of the electric circuit of each connected device meets the specified rating at
each branch and receptacle.

Important Safety Instructions
2Emerson
®MPH2™User Manual
EUROPEAN UNION
Notice to European Union Customers: Disposal of Old Appliances
This product uses components that are dangerous for the environment, such as
electronic cards and other electronic components. Any component that is removed
must be taken to specialized collection and disposal centers. If this unit must be
dismantled, this must be done by a specialized center for collection and disposal
of electric and electronics appliances or other dangerous substances. This product
has been supplied from an environmentally aware manufacturer that complies with
the Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC. The
“crossed-out wheelie bin” symbol at right is placed on this product to encourage
you to recycle wherever possible.
Please be environmentally responsible and recycle this product through your
recycling facility at its end of life. Do not dispose of this product as unsorted municipal waste. Follow local
municipal waste ordinances for proper disposal provisions to reduce the environmental impact of waste
electrical and electronic equipment (WEEE).
For information regarding the scrapping of this equipment, go to http://www.eu.emersonnetworkpower.com
(“Products session” or “Contact us” session) or call Emerson’s worldwide technical support at:
• 00 80011554499 (toll free number)
• [phone] (toll number based in Italy)
ROHS Compliance
The MPH2 Rack PDU modules comply with the Restriction of Hazardous Substances directive (ROHS),
prohibiting use of six hazardous materials manufacturing of electronics, including lead-free solder.
FCC Compliance
This unit complies with the limits for a Class A device pursuant to Part 15 of the FCC Rules. Operation is
subject to the following two conditions:
This device may not cause harmful interference, and
This device must accept any interference received, including interference that may cause undesired
operation.
!
CAUTION
All configuration steps must be completed before attempting to start equipment connected to the
MPH2 Rack PDU.
!
NOTE
For power management purposes, record the receptacle where each piece of equipment is
connected. Receptacles on the MPH2 Rack PDU have a numeric designation. The MPH2 Rack
PDU identifies the receptacles with numbers and are grouped by branch with a letter referring to
the proper circuit breaker.
NOTE
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used
in accordance with the instruction manual, may cause harmful interference to radio
communications.
Operation of this equipment in a residential area is likely to cause harmful interference that the
user must correct, including the expense of all corrective modifications.

Safety Symbols
Emerson®MPH2™User Manual 3
Safety Symbols
The following symbols may appear within the documentation or on the product.
Symbol Meaning
High Temperature
Alerts the user where the enclosure temperature may exceed 158°F (70°C) while operating under high-
ambient temperature and at maximally rated load.
Instructions
Signifies the presence of important operating and maintenance (servicing) instructions in the literature
accompanying the appliance.
Dangerous Voltage
Warns about the presence of uninsulated dangerous voltage within the product’s enclosure that may be
of sufficient magnitude to constitute a risk of electric shock to persons.
Power On
Indicates the principal On/Off switch is in the On position.
Power Off
Indicates the principal On/Off switch is in the Off position.
Protective Grounding Terminal
Indicates a terminal that must be connected to earth ground before any other connections to the
equipment may be made.

Introduction
4Emerson
®MPH2™User Manual
1.0 Introduction
The Emerson Network Power®MPH2™is the most intelligent, high-availability line of managed rack PDUs.
It offers remote monitoring and control capabilities as well as environmental sensors with multiple power
input selections and output configurations.
Metering Levels
Four types of MPH2 are available that offer metering of all electrical information including input, branch
and receptacle levels, as well as integration with environmental sensors. The available information varies
by type of MPH2. See 1.2 - Model Types, page 7for descriptions.
Mounting
Rack PDUs are available for mounting in vertical and horizontal configurations in standard racks or
network enclosures.
Because the power cord is connected at the end of the vertical-mount (0-U) MPH2 models, the rack PDUs
may be oriented to accommodate top or bottom cable-entry into the rack.
Locking Receptacles - IEC Type Only
Locking receptacles are available on models with IEC receptacles. The locking feature requires optional
locking power cords to be installed on devices powered by the MPH2.
The receptacles require no modification to function properly with non-locking power cords.
Overcurrent Protection
All MPH2 Rack PDU units with input current rating of 30 A and higher feature 100% rated
hydraulic-magnetic breakers. For all UL-listed models, the maximum cord and plug-connected loading is
limited to 80% continuous loading, as required by UL in accordance with the National Electric Code.
Low-profile circuit breakers are used on all MPH2 0-U Rack PDUs with two or three branch circuits.
Standard-profile circuit breakers are used on MPH2 horizontal models and on certain vertical models that
have 6 branch circuits or have a 240 VAC rating. Each type of circuit breaker is a flush-mount, rocker style
(see Figure 3-17).
Integrated Monitoring and Management
The factory-installed Emerson RPC2™communications module permits managing the MPH2 Rack PDU
over a secure Web page and SNMP-based network management system. The RPC2 permits
interconnecting up to 4 rack PDUs in a Rack-PDU array configuration for monitoring and management.
NOTE
Do not interconnect RPC-1000 with RPC2 Rack PDUs in an array. They are incompatible and will
not interoperate.
NOTE
Refer to the RPC2 communications module user manual, SL-20841, for detailed instructions on
installing and using the RPC2 module. The document is available at Emerson’s Web site:
http://www.emersonnetworkpower.com

Introduction
Emerson®MPH2™User Manual 5
A rack PDU can be monitored locally through its on-board LCD, through a Web interface or through an
optional display module, either the RPC BDM (Part# RPCBDM-1000). The display module connects
directly to the RPC2 communications module and may be moved between operating MPH2 units. It can be
hand-held, mounted in or on the rack or mounted on a wall near the rack PDU it is monitoring.
Multiple MPH2 Rack PDUs can be managed with these software applications:
• Avocent®Rack Power Manager software
• Avocent DSView™management software
• Emerson’s Trellis™Real-Time Infrastructure Optimization platform software
• Liebert®Nform®, which adds group-based receptacle management
• Liebert SiteScan®
Figure 1-1 Vertical MPH2 Rack PDU Configuration
Number Description Number Description
1 Vertical MPH2 Rack PDU 6 Serial appliance
2 Connected equipment 7 RPC basic display module (BDM)
3 Case ventilation, both sides (Optional) 8 Monitoring station
4 Rack PDU array 9 Network connection (10 MB/100 MB/1 GB)
5 Sensors—integrated and modular

Introduction
6Emerson
®MPH2™User Manual
Figure 1-2 Horizontal MPH2 Rack PDU Configuration
1.1 General Characteristics
• Input ampacities include 16 A or 32 A for European Union versions and 12 A to 48 A for
North-American versions.
• Single-phase and three-phase.
• Input voltages include 100-120 VAC, 120/208 VAC, 200-240/415 VAC.
• Receptacle types include NEMA 5-20, IEC 60320 C13 and IEC 60320 C19
• Input connection supports a highly flexible fixed power cord or hard-wired connection to user
accessible terminal block.
Number Description Number Description
1 Horizontal MPH2 Rack PDU 5 Rack PDU array
2 Connected equipment 6 RPC basic display module (BDM)
3 Network connection (10 MB/100 MB/1 GB) 7 Sensors—integrated and modular
4 Monitoring station 8 Serial appliance

Introduction
Emerson®MPH2™User Manual 7
1.2 Model Types
There are four types of MPH2 Rack PDU. All models provide power distribution and include input and
branch metering.
•Type B—Rack PDU metered: Provides metering of input and branches.
•Type C—Rack PDU metered, receptacle-switched: Provides metering of input and branches and
individual on/off control of eachreceptacle.
•Type M—Receptacle-metered: Provides metering of input, branches and receptacles.
•Type R—Receptacle-metered, receptacle-switched: Provides metering of input, branches and
receptacles. Provides individual on/off control of each receptacle.
1.3 Appearance and Components
1.3.1 Controls and Indicators—RPC2™
The MPH2 Rack PDU is monitored and managed by the factory-installed RPC2 communications module.
This manual presents information about the MPH2’s functions and features. For details on operating the
MPH2 through the RPC2 communications module, refer to the RPC2 user manual, SL-20841. The
document is available at Emerson’s Web site: http://www.emersonnetworkpower.com
The RPC2 is installed near the middle of the MPH2 Rack PDU. The central location eases connections
whichever orientation is required for network cabling.
The RPC2’s Web-based interface provides system-operating measurements, sensor readings (optional)
and basic unit information including firmware version, unit rating, model number and serial number.
Figure 1-3 MPH2 major monitoring and management features
Number Description Number Description
1 Serial port 5 Array link/management port
2USBport 6Networkport
3 Sensor port 7 Access to Reset button
4 Display port

Introduction
8Emerson
®MPH2™User Manual
1.3.2 LED Indicators
The MPH2 Rack PDU also has LEDs that indicate receptacle and branch status and system information.
The LEDs flash, pulse or change colors to indicate an event or alarm condition (for details on how LEDs
respond to events and alarms, refer to 5.0 - Troubleshooting.
1.3.3 On-board LCD Controls and Indicators
Emerson’s MPH2 has an integrated, on-board LCD that can be used to view information about the rack
PDU. The information available depends on the type of MPH2. For additional information about the
on-board LCD, refer to 3.0 - Operation.
1.3.4 Power Components
The component location and type depend on the model of the MPH2 Rack PDU. For example, units
with a “B” as the fourth character in the model name do not have LEDs at their receptacles; see Figures 1-
4,1-5 and 1-6.
Figure 1-4 Branch and receptacle identification—Units with no monitoring (Type B models)
NOTE
Units with a “B” as the fourth character in the model name (MPHBxxxx) do not have LEDs at their
receptacles. The branch and receptacle LED behavior in 5.0 - Troubleshooting and elsewhere in
this document does not apply to these units.
Receptacles on units with an “M” as the fourth character in the model name (MPHMxxxx) cannot
be turned off. Refer to the description of branch and receptacle LED behavior in 5.0 -
Troubleshooting.
Number Description
1 Branch identification
2 Receptacle identification

Introduction
Emerson®MPH2™User Manual 9
Figure 1-5 Branch and receptacle identification—Units with individually-monitored
and managed receptacles (Type C, R and M models)
1.3.4.1 Branch Overcurrent Protection
Models having more than 16-A input-current rating are equipped with branch overcurrent protection. The
branch circuit breaker is a UL 489-listed breaker with a flush-mount, rocker-style actuator. This protects
each receptacle group against overload and short circuit by interrupting the fault current flowing in the
line-to-line, line-to-neutral and line-to-PE conductors of the branch circuits. The branch circuit breaker
ratings apply over the full, rated operating temperature and frequency.
The flush-mount breakers guard against accidental trips that could interrupt power to the connected load.
Manually tripping a breaker requires a small, flat blade, such as a screw driver (see Figure 3-17).
Low-profile circuit breakers are used on all MPH2 Rack PDUs with two or three branch circuits less than
240-V rating in a line-neutral configuration. Standard-profile circuit breakers are used on MPH2 Rack
PDUs with six branch circuits or have a 240-VAC rating. Each type of circuit breaker is a rocker style (see
Figure 1-6).
The branch circuit breaker labeling (A, B, C and so on) shows which receptacles are protected by each
specific breaker. Receptacles on Branch A are protected by the circuit breaker labeled A. Three-phase
PDUs may also have labeling showing the phase associated with each circuit breaker.
Number Description
1 Branch identification
2 Receptacle identification
3Receptacle-status LED (See 5.0 -
Troubleshooting, page 42.)
NOTE
The branch circuit breaker is not designed to be used as a disconnect device for the connected
load.

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10 Emerson®MPH2™User Manual
Figure 1-6 Circuit breaker branch identification
1.3.5 Hard-Wired Connection Features
Emerson’s MPH2 Rack PDU may be equipped with either a factory-installed input power cord or
hard-wired connections. The hard-wired connection will be at one end of the unit. A terminal block in the
hard-wired connection compartment is coded to aid in making the connections. A collar secures the input
wire, keeping the strain off the terminal block connections. See Figure 2-1.
Number Description
1 Low-profile circuit breaker
2 Standard-profile circuit breaker
3 Branch identification

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Emerson®MPH2™User Manual 11
2.0 Installation
An MPH2 Rack PDU can be installed in an Emerson rack on the frame members using factory-supplied
hardware. The unit can be installed on the face or the side of frame members. The unit can be mounted so
that the power cord exits either the top or bottom of the rack.
Disconnect Required for Hard-Wired MPH2 Units
A readily-accessible input-power disconnect device must be installed near the MPH2 Rack PDU.
Input Power Location for MPH2 Units with Factory-Installed Power Cords
The input-power socket or outlet must be installed near the MPH2 and must be easily accessible.
2.1 Attaching Input Power Cords—Hard-wired Models Only
MPH2s with integral power cords need no assembly before installation. Units with hard-wired input power
require attachment of input-power cords. See Table 2-1 for wire sizing.
Hard-wired models may be wired with or without conduit.
2.1.1 Attaching Input-power Cords without Conduit
1. Remove the end cap. It is held in place with two T10 Torx screws.
2. Slide the terminal block cover off.
3. Loosen the strain-relief collar. It is held in place with two Phillips head PH1 screws.
4. Strip the insulation from the individual wires as required to fit into the terminal block.
Recommended stripping length for MPH2 units rated less than 32 A is 9 mm; for MPH2s rated 40 A or
higher, 11 mm.
5. Slip the power cord through the hole in the end cap and through the strain-relief collar.
6. Loosen the terminal block screws.
7. Insert the wires into the terminal block according to the labeling inside the MPH2; tighten each terminal
block screw after inserting a wire. Refer to Table 2-2 for tightening torque.
8. Tighten the strain-relief collar around the input power cord. The cord’s outer insulation covering should
extend through the bracket.
NOTE
Follow all local and national electrical codes, standards and recommended practices.

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12 Emerson®MPH2™User Manual
9. Replace the terminal block cover by either sliding it on or snapping it into place.
10. Reattach the end cap to the MPH2 with the two screws removed in Step 1.
Figure 2-1 Disassembly to install an input-power cable
2.1.2 Attaching Input-power Cords with Conduit
1. Remove the end cap. It is held in place with two T10 Torx screws.
2. Slide the terminal block cover off.
3. Loosen the strain-relief collar. It is held in place with four nuts (see Figure 2-1).
4. Strip the insulation from the individual wires as required to fit into the terminal block.
Recommended stripping length for MPH2 units rated less than 32 A is 9 mm; for MPH2s rated 40 A or
higher, 11 mm.
5. Slip the stripped wires through the conduit connector, through the metal end plate and into the terminal
block connection box.
6. Loosen the terminal block screws.
7. Insert the wires into the terminal block according to the labeling inside the MPH2; tighten each terminal
block screw after inserting a wire. Refer to Table 2-2 for tightening torque.
8. Install the cover plate, by either sliding it on or snapping it into place and sliding it firmly against the
main body of the MPH2.
9. Install the cover plate, by either sliding it on or snapping it into place and pressing it against the cover
plate.
10. Attach the metal end plate to the MPH2 with four screws provided in the kit.
Number Description Number Description
1 Cover plate 4 Terminal-block labels
2 Terminal-block screws 5 Strain-relief collar w/Phillips-head screws
3 Terminal blocks 6 End cap (attached with 2 screws)

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11. Slide the conduit into the conduit connector.
12. Tighten the conduit connector until it grips the conduit and crimps it securely.
Figure 2-2 Re-assembly to install an input power cable in conduit
Number Description Number Description
1 Cover plate 5 Strain-relief collar w/Phillips-head screws
2 Terminal-block screws 6 Metal end plate (attached with 4 screws)
3 Terminal blocks 7 Conduit connector (field-supplied)
4 Terminal-block labels 8 Conduit (cable not shown)
Table 2-1 Hard-wired models—Connection terminal ratings
MPH2 Rating
≤32 A >32 A
Conductor Cross-Section Solid, Minimum 0.2 mm²0.5 mm²
Conductor Cross-Section Solid, Maximum 6mm
²16 mm²
Conductor Cross-Section Stranded, Minimum 0.2 mm²0.5mm²
Conductor Cross-Section Stranded, Maximum 4 mm² 10 mm²
Conductor Cross-Section, AWG/kcmil, Minimum 24 20
Conductor Cross-Section, AWG/kcmil, Maximum 10 6
Conductor Cross-Section Stranded, with Ferrule
without Plastic Sleeve, Minimum 0.25 mm²0.5 mm²
Conductor Cross-Section Stranded, with Ferrule
without Plastic Sleeve, Maximum 4mm
²10 mm²
Conductor Cross-Section Stranded, with Ferrule
with Plastic Sleeve, Minimum 0.25 mm²0.5 mm²
Conductor Cross-Section Stranded, with Ferrule
with Plastic Sleeve, Maximum 4mm
²10 mm²

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14 Emerson®MPH2™User Manual
2.2 Tool-less Mounting
For tool-less mounting, attach the mounts to the rear of the MPH2 Rack PDU, then hang it in the rack as
shown in Figure 2-3. Torque the screw attaching the mounting button 17 lb-in. (2 Nm).
Figure 2-3 Tool-less mounting
Table 2-2 Terminal tightening torque
Tightening Torque
MPH2 Rating
≤32 A >32 A
Minimum 0.6 Nm (4.4 lb-in.) 1.5 Nm (13.3 lb-in.)
Maximum 0.8 Nm (7.1 lb-in.) 1.8 Nm (15.9 lb-in.)
NOTE
Brackets are not supplied. A range of brackets for Emerson and other manufacturers’ racks are
available as accessories.
Number Description
1Torx screw
(tighten torque 17 lb-in. (2 Nm)
2 Button mount
3 Insert button mount into keyhole slot.

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Emerson®MPH2™User Manual 15
2.3 Installing a MPH2 in an Emerson®Rack
2.3.1 Mounting Hardware and Tools Required
Factory-supplied
• 2 mounting brackets
• 2 mounting buttons
•4springnuts
Field-supplied
For mounting a vertical MPH2
• Phillips #2 screwdriver
For mounting a horizontal MPH2:
• Flat-blade screwdriver
• Torx screwdriver TX30
• Torque wrench
2.3.2 Mounting the Vertical MPH2
The vertical MPH2 can be installed on a vertical or horizontal frame member in the rack.
1. Determine where in the Emerson rack the PDU will be installed.
2. Attach a bracket to each end of the PDU.
3. If mounting on horizontal frame members, attach the brackets in-line, Figure 2-4.
- or -
If mounting on a vertical frame member, attach the brackets at a right angle to the PDU.
4. Insert two spring nuts into the appropriate T-slot on the frame member, Figure 2-4. Position the spring
nuts to accommodate screws inserted through slots in the brackets. To move the spring nuts, press
down on each with a small, pointed object and slide each into position.
5. Hold the PDU in place and attach the top of the unit to the rack with tool-less fasteners, Figure 2-4.