PowerHub 2 PDU Guide Specification
PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
1 General
1.1 Summary
These specifications describe requirements for a power distribution unit (PDU)
distributing power to sensitive loads.
1.2 Standards
The PowerHub 2 PDU shall be listed to the applicable portions of Underwriters
Laboratories standards UL 1062 (PDU Standard) and tested to UL 1950.
In addition, the PowerHub 2 PDU shall be designed, manufactured, tested, and installed in
compliance with the following standards:
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UL67
UL50
UL489
UL891
NFPA
IEEE 519-1991
ANSI C33.4
NEMA ST-20
NEMA AB-1
NEMA-PB-1
NEC
IBC 2010, seismic zone 4, California standard
ISO 9001
The PDI PowerHub 2 PDU shall comply with the latest FCC Part 15 EMI emission standard
for Class A computing devices.
1.3 System Description
1.3.1 Environmental Requirements
The PDU shall have the following environmental requirements for operation and storage:
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Acceptable temperature ranges:
_______________________________________________________________________________________________________
Power Distribution, Inc. – Transform. Distribute. Monitor. ™
4200 Oakleys Court | Richmond, VA 23223 | T +1.804.737.9880 | www.pdicorp.com
4011 W Carriage Drive | Santa Ana, CA 92704 | T +1.714.513.1500
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
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o Storage temperature shall be between -10⁰C and +70⁰C (-33⁰F to
158⁰F).
o Operating temperature shall be between 0⁰C to 40⁰C (32⁰F to 104⁰F).
Relative humidity range from 0% to 95% non-condensing.
Operating altitude to a maximum of 6,600 ft. For operating the PDU at
altitudes over 6,600 ft., the user shall consult the PDI factory for de-rating
information.
Storage and transport altitude: Up to 40,000 ft. (12,200 m) above Mean Sea
Level.
Audible noise: The audible noise level shall comply with the NEMA-ST
standard.
1.3.2 Electrical Requirements
The PDU has a kVA rating of 400 -750 kVA.
The PDU input frequency shall be 60 Hz ± 5 Hz or 50 Hz ± 5 Hz.
The PDU shall accept a 3-phase, 3-wire plus ground nominal input source voltage from
among these standard voltages:
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@ 50 Hz: 380V-415VAC
@ 60 Hz: 600, 575, 480, or 208VAC
The PDU output voltage shall be one of the following standard nominal voltages, 3-phase,
4-wire plus ground:
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@ 50 Hz: 380/220, 400/231, 415/240VAC
@ 60 Hz: 600/346, 575/332, 480/277, 415/240VAC or 208/120VAC
However, if the Multi-Output Transformer Option is installed, the PDU shall be
reconfigurable in the field to an output voltage selected from up to three of these voltages
at 60 Hz: 480/277, 415/240VAC or 208/120VAC.
The PDU shall also accept a non-standard voltage for input and/or shall provide a nonstandard voltage for output within the range 208-600VAC @50 Hz or 60 Hz if the PDU
transformer is custom-designed for these non-standard voltages.
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
1.4 Documentation
1.4.1 Drawings
PowerHub 2 PDU 1-line electrical drawings and outline or other mechanical drawings
shall be furnished after PDI receives a Purchase Order. For quoting prospective sample
preliminary submittal drawings with features for 400-750 kVA PDUs shall be available.
1.4.2 Installation and Operations Documentation
A PowerHub 2 Power Distribution Unit, Installation and Operations manual shall be
furnished. Points lists (Modbus register maps) for monitoring the PDU board (including
the source main input feed, transformer, and contractor board) and output subfeeds shall
be available for downloading from the PDI website.
1.4.3 Spare Parts
A list of recommended spare parts shall be made available at customer request.
1.4.4 Contact List
A contact list for PDI functions, such as Service and Accounting, shall be provided.
1.5 Warranty
The manufacturer shall provide a 12-month warranty against defects in material and
workmanship for 12 months after initial startup or 18 months after shipping date,
whichever comes first.
1.6 Quality Assurance
The PDI PowerHub 2 PDU shall be designed and manufactured according to
internationally recognized quality standards, including those listed in section 1.2
Standards. The manufacturer shall be ISO 9001 certified.
The PDI PowerHub 2 PDU shall be factory tested before shipment. Testing shall include at
minimum:
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Quality control checks specific to the unit and its configuration, including function
testing to determine that the unit functions as designed.
Hi-Potential Test at two times the unit’s rated voltage plus 1000 volts, per UL
60950-1 requirements.
Minimum one-half hour of PDU burn-in at a typical load or longer burn-in at
customer request.
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
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Calibration tests for monitoring.
Tests for alarm annunciation as designed and/or as the customer requests.
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
2 Product
2.1 Components: Enclosure
2.1.1 Enclosure Specification
The PDU shall consist of a main cabinet enclosure alone.
The main cabinet enclosure shall be constructed in a modular configuration to NEMA-1
standards and shall meet IP20 requirements.
Enclosure dimensions The cabinet enclosure dimensions shall be the following:
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60" W x 84" H x 40" D for 400 kVA, if the PDU has the standard transformer.
60” W x 84”H x 42” D for 500 kVA, if the PDU has the standard transformer.
60” W x 84”H x 48-50"D for 625 – 750 kVA, if the PDU has the standard
transformer.
Cabinet depth may vary up to 52”D, if required by specific transformer
specifications, such as K factor, temperature rise, inrush, impedance, or aluminum
construction.
Enclosure weights
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The PDU weight shall depend upon the cabinet size and transformer specifications.
A typical 500 kVA PDU shall weigh approximately 3800 lbs.
Cooling The unit shall be convection cooled and shall have no fans. Heat rejection shall be
through ventilation openings. Convection cooling shall be sufficient for full load operation.
Paint The cabinet enclosure shall be primed and painted inside and out with a suitable
powder coat enamel. The paint color shall be PDI Black or IBM Pearl White or “computer
hardware off-white” to match other PDI equipment in appearance, especially the
WaveStar® Static Transfer Switch. Customer may specify alternate color(s) that must be
reviewed and approved by PDI Engineering.
Enclosure modifications Line and match requirements with static switches shall be met
through modification of the static switch enclosure.
2.1.2 PDU Access
Front access only The PDU shall require only front access for service and all routine
maintenance unless the PDU has the Multi-Output Transformer Option.
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
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Adding or replacing power distribution cables and circuit breakers shall require
only front access.
Wiring communications or replacing components in the Monitoring Compartment
shall require only front access.
The Fuse Panel shall be front-accessible.
Standard transformer taps shall be adjustable from the front of the PDU.
Rear access If the PDU has the Multi-Output Transformer Option, 36" rear service access
shall be required to change large bus bar transformer taps.
Doors and physical access controls The PDU shall have the following physical access
controls:
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Front doors with lock.
A Monitoring Compartment on the PDU left front door that is accessible by its
own lockable door. The Monitoring Compartment shall contain low-power
monitoring components segregated from high-power components in the Main
Cabinet.
Circuit breaker access controls:
o All circuit breakers and switches shall be mounted behind closed doors. The
PDU shall have exterior hinged circuit breaker cover doors with transparent
windows for main input, optional main output, and distribution subfeed circuit
breakers.
o Each circuit breaker compartment shall be lockable.
o The PDU shall have dead front panels over the output subfeed circuit breakers.
The dead front panels shall allow screw-on plates to cover unused breakers
positions.
Panels All removable PDU panels shall use non-captive screws and shall either lift off or
incorporate ¼ turn latches.
Clearances The PDU shall require the following clearances:
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Service clearances:
o Front: 36" (service, including ventilation).
o Rear or side: 36" service clearance shall be required only if the Multi-Output
Transformer Option is installed.
Ventilation clearances:
o 6" both rear and one side minimum.
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
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o 18" top.
Cabling clearance: 12" underfloor clearance recommended if bottom cable entry or
exit is used.
2.1.3 Mounting Options
The PDU shall be suitable for installation on both fixed floor or on a floor stand in a raised
floor environment. The cabinet shall allow mounting on a 12-60"H floor stand to match
12-60"H raised flooring.
The PDU alone or the PDU with floor stand shall conform to seismic zone four
requirements, California standard, per IBC 2010.
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A skirt or kick plate providing air closure around the PDU shall be available as an
option.
2.2 Components: Electrical Construction
All wiring shall be rated per the National Electrical Code (NEC).
The PDU shall include a computer grade single point ground in accordance the
requirements of the NEC. Each distribution output section shall have a ground bus bar for
distribution output subfeeds.
The PDU shall have a copper bus connection with 200% neutral that is welded to the
transformer and bolted to the PDU bus, which can be implemented variously, as follows:
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All 200% neutral can be on one side of the transformer.
Both sides of the transformer can each allow 100% neutral.
Both sides of the transformer can each allow 200% neutral (optional).
The PDU shall have a 200%-rated neutral copper bus bar as standard in each distribution
subfeed section or shall have a smaller percentage rated neutral as specified by the
customer, subject to approval by PDI Engineering.
Cable landing The PDU shall allow both top and bottom cable input and output on the
front half of the cabinet. Top and bottom cable landing panels shall be removable. The top
cable landing panel shall be solid plate painted and not pre-punched. Bottom panels shall
be solid plate galvanized, not pre-punched, and shall not be painted. If aluminum
conductors are used, there may be limitations on conduit.
If the PDU is configured as part of a Primary System with a WaveStar® Static Transfer
Switch (STS), side cable access to the Static Transfer Switch shall be provided.
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
2.3 Components: Transformer
The PDU shall be fed from an integral 3-phase, copper-wound or optionally aluminumwound, high isolation standard transformer rated between 400 kVA and 750 kVA. The
transformer shall be specifically designed for the PDU and its applications and shall
provide voltage transformation, voltage adjustment, high isolation, conditioning, and
shielding. Each transformer shall have electrostatic shielding and shall use a universal
footing template to secure the transformer to its base inside the PDU
2.3.1 Standard Transformers
Standard transformers shall be available with K-factor K9 that comply with DOE2016
efficiency requirements. Other standard transformers shall be available with the
specifications and options shown in Table 1.
Non-DOE2016 transformers shall be available for non-USA customers and certain exempt
categories in the USA.
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
Table 1 Standard Transformer Specifications and Options
Parameter
Input Voltage
Output Voltage1
Frequency
Impedance
Efficiency
Standard Transformer
480V Delta
208 /120V Wye
60 Hz
3 – 5%
DOE2016 (USA)
K-Factor
Conductor Material
Inrush
Taps2
K9
Copper (CU)
8 – 10x
< 750 kVA: ±2 x 2.5-3.5%
≥ 750 kVA: ±1 x 2.5-3.5%
Temperature Rise
Vector
150⁰C
Delta-Wye
Average sound level
Applicable Standard
NEMA ST-20
UL-1561
IEEE Standard C57.12.01
Class 240S
Insulation
1 Multi-Output
Options
208 – 600V
208 – 600V
50 Hz
Up to 6%
Non-DOE2016 for certain
exempt US categories, CEC,
CSA, TP1 (CSA), NEMA
Premium, or the highest
efficiency international
standard
K4, K13, K20
Aluminum (AL)
5x
No taps; custom taps
available, percentage subject
to physical location
80ºC, 115ºC, 130ºC, 175ºC
Delta Zig-Zag
Delta Quad-Wye
NEMA ST-20
IEC 60076, CSA22.2 No 66,
CEC 400
Transformer Option allows the PDU output voltage to be field-reconfigurable to alternate voltages.
2 Conventional
transformer taps are not available if the Multi-Output Transformer Option is installed.
2.3.2 Multi-Output Transformer Option
The Multi-Output Transformer Option shall enable the single output voltage of the PDU to
be reconfigured in the field for these alternate voltages at 60 Hz:
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208/120VAC
415/240VAC
480/277VAC
PDUs with the Multi-Output Transformer Option shall have large voltage bus bar taps that
allow the transformer output to be reconfigured from the rear of the PDU. To access the
busbar taps, the PDU shall require 36" rear or side service clearance or the PDU must be
moved to reconfigure the taps.
The following features shall not be available with the Multi-Output Transformer Option:
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Conventional front-accessible transformer taps
Manual Dual PDU Option
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
2.3.3 Transformer Temperature Monitoring
The standard transformer shall have six (6) thermal overload devices to monitor core
temperature in each winding.
The first set of thermal devices shall be calibrated to 180⁰C, the warning threshold. If any
winding reaches 180⁰C core temperature, the thermal overload protection device shall
close a set of contacts for remote annunciation of a potential over-temperature condition.
The second set of thermal devices shall be calibrated to 200⁰C, the shutdown threshold. If
any winding reaches 200⁰C core temperature, the thermal overload protection device
shall close a set of contacts for remote annunciation of an over-temperature condition and
shall initiate an automatic PDU shutdown. A shutdown threshold of 195⁰C shall be
available as an option.
2.4 Power Configurations
2.4.1 Main Input Circuit Breaker
Each PDU shall have a 600V, 480V, or 400V thermal-magnetic main input circuit breaker
with optional electronic trip. The circuit breaker shall be manually operated and sized in
compliance with the NEC. The main input circuit breaker shall be available as 80%-rated
or 100%-rated.
The main input circuit breaker shall be rated for different transformer sizes and input
voltages as given in the following table:
kVA
400
500
625
750
CB @ 400VAC
800A
1000A
1200A
1600A
CB @ 480VAC
700A
800A
1000A
1200A
CB @ 600VAC
500A
700A
800A
1000A
The main input circuit breaker shall have these kAIC ratings:
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600V at 22 kAIC
480V at 35 kAIC
400V at 35 kAIC
380V at 35 kAIC
2.4.2 Input Power
The main input bus shall also be compatible with a main lug only (MLO) power feed—that
is, without a main breaker.
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
The input AC voltage termination from the main input to the transformer primary shall be
welded or cabled and shall be accessible from the front of the PDU. The input interrupting
current rating shall support up to 65 kAIC at 480VAC.
The ground conductor shall connect to an insulated ground busbar.
2.4.3 Extended Input Bus Option
The PDU shall optionally have an Extended Input Bus, allowing input power connections
with double-hole compression lugs and top and bottom connections to the Extended Input
Bus.
2.4.4 Transformer Output Circuit Breaker
An optional output circuit breaker off the transformer secondary shall be available, as may
be required by the NEC with six or more distribution subfeeds. The standard output circuit
breaker shall be a Schneider Electric Square D standard R-Frame 3-pole circuit breaker
rated at 80 percent for up to 600 VAC with interrupting ratings of 65 kAIC@240 VAC, 35
kAIC@400-480VAC, and 18 kAIC@600VAC. Other Square D circuit breakers shall be
available that are sized appropriately for the PDU with 80 or 100 percent ratings, various
trip options, and various kAIC ratings.
2.4.5 Distribution Output (Subfeeds)
The main output bussing shall be designed for minimum 65 kAIC at 240VAC or 35 kAIC at
400-480VAC. Output circuit breakers shall be available with the minimum kAIC ratings at
240VAC and 480VAC.
Output subfeed circuit breakers shall have these characteristics:
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Output subfeed circuit breakers shall be configured in two columns and shall be of
the same frame type throughout both columns.
Output subfeed circuit breakers shall be offered in 80% ratings (standard) and
100% ratings (optional).
Electronic trip circuit breakers shall be used where available (see tables below for
exceptions).
Output subfeed circuit breakers shall be available with optional control wiring for
these features:
o Auxiliary status
o Trip alarm
o Shunt trip
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
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The PDU distribution output (subfeed) circuit breakers used in the PDU shall be
manufactured by Schneider Electric. The PDU shall accommodate Q, J, L, and Lframe plug-in frame types for Schneider Electric Square D PowerPact circuit
breakers.
The number of subfeed circuit breakers that can be installed in the PDU per frame type is
given in the following tables along with amperage and kAIC ratings (the values in these
tables are for copper conductors unless otherwise noted):
Circuit
Breaker
Frame
Amps
Circuit
Breaker
Quantity
Circuit
Breaker
Frame
Amps
Circuit
Breaker
Quantity
Q Frame
25/65 kAIC
(Thermal-magnetic only)
150
175
225
150
175
225
250
14
16
16
16
16
250
14
J Frame
25/65/100 kAIC
14
L Frame & L Frame Plugin
L Frame (65/100 kAIC)
L Frame Plug-in (65 kAIC)
400
500
600
12
12
12 (9)*
9 (7)*
*Numbers in ( ) are for Aluminum conductor.
2.5 PDU Power Features
2.5.1 Emergency Power Off
The PDU shall contain an internally powered 120VAC or 24VDC shunt trip mechanism to
operate a local Emergency Power Off (EPO) and effectively interface with the WaveStar®
monitoring system. Each PDU shall have a common EPO circuit, designed to accept a
normally open (NO) dry contact signal.
A 24VDC, 24VAC, or 120VAC remote shunt trip signal shall be available to interface with
Remote Emergency Power Off (REPO) stations.
2.5.2 Manual Restart
The PDU shall contain a manual restart circuit to protect the connected load during a
system restart sequence. A switch shall be provided to allow this feature to be set in the
field for manual or automatic restart.
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
2.6 Optional Power Features
2.6.1 Manual Dual PDU
The PDU shall optionally allow manual switching between two input power sources using
a make-before-break Trapped Key Interlock or Kirk Key Interlock system with a synccheck relay. The Manual Dual PDU Option shall also allow a secondary dry contact signal
that remotely enables the synchronization and switching process.
2.6.2 Surge Protective Device(s)
The PDU shall optionally include a single Surge Protective Device (SPD) or Transient
Voltage Surge Suppressor (TVSS) rated 100 kA or 200 kA on the input or output. The SPD
shall comply with ANSI/UL1449 3rd edition and shall incorporate a remote signaling dry
contact. SPD status lights shall also be visible through the front door. Only one SPD shall be
allowed per PDU.
2.7 Monitoring
The PDU shall incorporate a PDI WaveStar® Monitoring package that can interface to the
WaveStar® Color Monitor, a Building Management System (BMS), or an independent
WaveStar® monitor such as a BCMS Hub. The customer may optionally choose no onboard display.
An EPO option shall be available that provides a guarded illuminated EPO button
positioned next to the display.
2.7.1 Color Monitor
The PDU shall mount a WaveStar® Color Monitor, a 7" diagonal color touchscreen on the
front of the Monitoring Compartment.
The Color Monitor shall be capable of displaying monitoring information from the main
input power source, transformer, PDU Board, Contractor Board, and all distribution
subfeeds. Monitoring information shall include circuit measurements, alarm display, alarm
clearing, audible alarm, and audible alarm silencing. The Color Monitor shall also include a
sync screen for trapped key release with the Manual Dual PDU Option.
With the display, the PDU shall also have an annunciation panel with audible alarm and
summary alarm indicator showing no alarms, warning condition, or alarm condition.
2.7.2 Color Monitor Protocols
For network communications upstream of the Color Monitor, the Monitor shall
communicate using any of the following protocols, which can be used simultaneously:
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
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Modbus RTU (2-wire or 4-wire)
Modbus TCP/IP
TCP/IP (for Color Monitor web pages only)
SNMP Version 1
Add-in cards shall not be necessary for the Color Monitor to communicate upstream in any
of these protocols.
For other than Modbus RTU, the Color Monitor shall require a customer Ethernet
connection to the customer network.
2.7.3 Color Monitor Web Pages
If the PDU has an appropriately configured Ethernet connection from the customer
network to the Color Monitor, web pages showing PDU monitoring data and optional
monitoring data for subfeeds shall be available remotely using TCP/IP.
2.7.4 Monitoring PCBs
The PDU shall monitor the transformer and input or output circuits using the following
installed PCBs with appropriate current transformer and voltage connections:
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(1) PDU board allowing monitoring input and output from the transformer and
voltage connections (standard).
(1) Basic Contractor Board (standard) or Enhanced Contractor Board (optional).
Enhanced Subfeed (“Resistor”) Boards allowing large subfeeds to be monitored (14
ABC circuits, or 10 ABCN circuits), provided as needed (with optional BCMS
subfeed monitoring).
(1) or (2) Branch Circuit Monitoring System (BCMS) boards as necessary to
monitor PDU subfeeds (with optional BCMS subfeed monitoring).
The monitored data points are those included in the points list or Modbus register maps
selected for the PCB’s and measured with current transformers (CTs) and voltage
connections.
2.7.5 Current Transformers
For monitoring, the PDU shall mount appropriately sized current transformers (CTs) for
the the transformer secondary phases. Appropriately sized CTs shall be optional on the
transformer primary side. The PDU shall also optionally mount appropriately sized CTs for
output subfeeds.
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
2.7.6 Contractor Boards
All Remote Emergency Power Off, building alarms, output relays, communication ports,
and other control wiring shall be terminated onto a Contractor Board which is an integral
component within the PDU system itself.
The Basic Contractor Board shall contain the following:
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Remote emergency power off (REPO) connections
Four (4) Relay Contacts (NO contacts) (including summary alarm)
Four (4) Building alarm contacts
Remote monitoring connection ports (Modbus RTU Protocol, RS-422/485)
The optional Enhanced Contractor Board shall contain the following:
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Remote emergency power off (REPO) connections
Eight (8) Relay Contacts (NO contacts) (including summary alarm)
Eight (8) Building alarm contacts
Remote monitoring connection ports (Modbus RTU Protocol, RS-422/485)
Local monitoring of PDI devices (Modbus RTU Protocol, RS-422/485)
2.7.7 Branch Circuit Monitoring System for Subfeeds
A WaveStar® Branch Circuit Monitoring System (BCMS) shall be optionally available for
monitoring distribution subfeeds. The following shall be monitored for subfeed circuits
with correctly installed CTs: circuit breaker size, current, minimum current, maximum
current, KW, KVA, KVAR, power factor (PF), crest factor, percent load, total harmonic
distortion (THD), KWH, voltage, frequency, and various alarms and warnings.
2.7.8 Points Lists
Points lists (Modbus register maps) shall be available for downloading from the PDI
website or by calling PDI Service at 1.800.225.4838.
2.7.9 Dry Contacts
The PDU shall have a dry contact network providing input and output signals as given
below, if the specified device is installed:
Output:

Monitor: Summary alarm, if an alarm is outstanding for any downstream
monitored device.
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
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PDU Contractor board: 4-8 remote relays with assignable meaning (Enhanced
Contractor Board required for > 4 remote relays)
Surge Protective Device: SPD OK/Not OK signal.
Subfeed Circuit Breakers: Breaker trip alarm, auxiliary contacts signaling change of
breaker state.
Input:
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PDU: Four (4) digital inputs with assignable meanings.
PDU and Contractor Board: 4-8 Building Alarms (Enhanced Contractor Board
required for > 4 Building alarms)
Subfeed circuit breakers: Circuit breaker trip signal.
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PDI PowerHub 2 Power Distribution Unit
Guide Specifications (Revision 000, 2/28/2017)
3 Execution
3.1 Factory Witness Test
PDI shall allow the customer to witness the factory testing of each unit. The factory shall
perform its standard witness test to demonstrate that the unit meets PDI’s PowerHub 2
PDU specifications.
3.2
Certified Test Report
A certified factory test report shall be provided for each unit.
3.3 Installation
Customer shall be responsible for site preparation and correct installation of the PDU in
accordance with provided product data, final shop drawings, and manufacturer’s written
recommendations and installation instructions.
3.4 Start-Up
A PDI-authorized representative shall validate correct installation and operation of the
PDU at initial PDU start-up.
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