Liebert micro smart switch User Manual

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PRODUCT

DUAL INPUT POWER DISTRIBUTION

MICRO SMAR TSWITCH

USER MANUAL

200 VAC to 240 VAC

50/60 Hz

24 Amps

General Description

The Liebert Micro SmartSwitch (MSS) is a single Phase Dual Input rack mount­able Power Distribution Unit (PDU) with a built in Automatic Transfer Switch.
When Input A falls below 168 VAC and Input B is valid, the output is automati­cally transferred to Input B. The output is transferred back to Input A when Input
A is valid and rises above 178 VAC. This high speed transfer rate ensures that
the transfer is transparent to the sensitive equipment.

The two sources are not required to be in phase. This is an effective solution that

uilds in redundancy and increases the AC power availability of connected

b
equipment. If the dual input power is fed through two independent AC sources,
then the system availability is increased and the dual input advantages are fully
used.

The Micro SmartSwitch provides 12 receptacles
power and may be rack mounted. There are four groups of three IEC-320 (10A)
receptacles, where each group is backed up by a 10A magnetic circuit breaker.
The MSS has two attached line cords that are terminated with NEMA L6-30
plugs with a 20A fuse for each. The total load for the MSS cannot exceed 24A of
AC load at 200-240 VAC. Also the load for each of the four groups cannot
exceed 10A or the internal breaker may trip or the fuse will blow. The load must
be balanced among the four segments such that the total current draw per section
does not exceed 10A and a total of 24A for all the four segments of the MSS.
This product provides line-to-line surge protection of 500 Joules.

that distribute redundant AC

Glossary of Symbols

Risk of Electrical Shock

Indicates Caution - followed by important instructions

!

Bonded to Ground

AC Voltage

On

I

Off

O

No user servicable parts inside

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About This Device

This guide serves as an outline to assist Qualified personnel with the installation
of the Liebert Micro SmartSwitch. The input voltage for this Micro SmartSwitch
unit is 200VAC to 240VAC.

This Micro SmartSwitch includes the following features:

• Mounts in 1U of rack space

• Provides 12 receptacles on 4 circuit breakers

• Protects against electrical line surges and spikes

This Micro SmartSwitch is UL and c-UL listed as Information Technology

uipment.

Eq

WARNING: There is a risk of personal injury from electrical shock

and hazardous energy levels. The installation of options and routine

!

maintenance and service of the product must be performed by individuals
who are knowledgeable about the procedures, precautions, and hazards
associated with AC power products (trained service technician).

To reduce the risk of electrical shock and
or servicing the Micro SmartSwitch:

• The Micro SmartSwitch must be disconnected from the product and

unplugged from the AC electrical outlet before servicing or repairing prod­uct.

• Do not overload the output of the Micro SmartSwitch. The total connected

should not exceed rated input power.

load

• Do not exceed the leakage current limit for the Micro SmartSwitch in your
system. See the “Earth Leakage Current” section later in this document for
limits.

Earth Leakage Current

To reduce the risk of electrical shock du
grounded (earth) connection is essential before connecting Micro SmartSwitch to
AC power. Observe the following limits when connecting the product to AC
power distribution devices.
For products that have attached AC power co
ing power, the total combined leakage current should not exceed 5 percent of the
rated input current for the device.
For products that have detachable AC power
current should not exceed 3.5mA.

Voltage Selection

On connected equipment that have voltage select switches, make sure that the
switch is set for the type of voltage you use (208/240 VAC).

/or equipment damage when installing

e to high leakage current, a reliable

rds directly connected to the build-

cords, the total combined leakage

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IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS.

This manual contains important instructions that should be closely followed dur­ing installation and maintenance of this product.

This product is designed for Commercial/Industrial use only. It is not intended
for use with life support and other U. S. F
imum load must not exceed that shown on the rating label. See Limited Warranty.

DA designated “critical” devices. Max-

WARNING: Lethal voltages may be present within this unit even when it is

apparently not operating. Observe all cautions and warnings in this manual.
Failure to do so MAY result in serious injury.

This equipment or Micro SmartSwitch is designed for use on a properly
grounded (earthed), 208/240 VAC, 50Hz or 60Hz supply.

ELECTROMAGNETIC COMPATIBILITY- The Micro SmartSwitch complies

the limits for a CLASS B digital device, pursuant to part 15 of FCC rules.

with
These limits provide reasonable protection against harmful interference. If this
device is not installed and used in accordance with the instruction manual, it may
cause harmful interference to radio communications. Not operating this device in
accordance with these instructions may cause harmful interference, which the
user must correct at their own expense.

Operate the Micro SmartSwitch in an i
temperature range of 0°C to 50°C (32°F to +122°F). Install it in a clean environ­ment, free from conductive contaminates, moisture, flammable liquids, gasses, or
corrosive substances.

Turn the Micro SmartSwitch off and isolate it from other equipment before

g. Use a soft cloth, never liquid or aerosol cleaners.

cleanin

Keep the vents free from dust accumulat

Never block or insert any object into the ventilation holes or other openings.

ndoor environment only in an ambient

ion that could restrict airflow.

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Installation

Place rear rail [R] over the studs in the front rail [F]. Tighten nuts finger tight.
The mounting tab [T] will be facing out, so the holes align with the rack sides.
Adjust length of rail assembly to fit inside rack. Tighten either the wing nuts or
hex nuts.

Insert cage nut (one on each side) in rack. Set hooks at rear of rail over holes in

ack. Use screw [2] (one on each side) to attach rails to rear of rack through cage

r
nut. Use screw [2] (two on each side) to attach rails to front of rack.

R

F

T

OUT SI DE

2

FRONT

Use screws [1] (two on each side) to attach brackets to side of unit. Slide unit
into rails and secure by using screws [2] (one on each side) to attach the unit.

1

2

1

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Ground Bonding Screw

A ground bond­ing screw is pro­vided on the rear
of the unit. This
feature is pro­vided as an
attachment point
for conductors
the rack may
contain for the
purpose of func­tional grounding
or bonding of
ungrounded
metal parts.
Ground cables
are not included.
Note: T
proper grounding.

Connecting Devices

Make sure that
the devices
nected do not
exceed the unit
capabilities.
This Dual Input
Micro
Switch features
3 output recepta­cles per circuit
breaker, for a
total of 12
receptacles.
This model is
rated at 10A per
breaker.
Each block of 3

eceptacles has a maximum output rating of 10A. If the total connected load

r
exceeds 10A, the circuit breaker will trip and interrupt power to all loads attached
to that block of receptacles.
The maximum output of this Micro SmartSwitch is 24A. If the total load con­nected to all load segments exceed 24A, the circuit breaker at the wall could trip
and interrupt power to all loads.

he Ground Bonding wire must be a minimum of 10 AWG to maintain

con-

Smart-

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About the Circuit Breakers

Input power can be verified by the illumination of the two LEDs on the front of
the unit, marked ~A and ~B.
Output power can be verified by the illumination of the circuit breaker, when in
the On position
If connected device is not powered, verify the respective circuit breaker is On
and illuminated.
If power is still not restored, see “Contacts” section later in this document.

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Configurations

The Micro SmartSwitch can be configured to fit several power distribution
requirements.

Configuration 1

This application shows use of the Micro SmartSwitch in conjunction with single-

rd devices .

line co
Note: Each segment can accommodate a maximum current draw of 10A, so the
individual load connected to it must not exceed 10A or the circuit breaker will
trip.

C Input A

~A: A

L6-30P

~B: AC Input B

1,2,3,4: Load segments on the

Micro SmartSwitch

~ A

Dual Input

~ B

1

P

2

D

3

U

4

L6-30P

Load: Any s

other equipment connected to
the Micro SmartSwitch

Configuration 2

This configuration shows the use of the Micro SmartSwitch with 3-line cord

evices. The figure below shows how three Micro SmartSwitchs can be used to

d
connect with up to four 3-line cord devices.

Note:

individual load connected to it must not exceed 10A or the circuit breaker will
trip.

erver, storage, or

200-240 VAC

Each segment can accommodate a maximum current draw of 10A, so the

Load

Load

Load

Load

C Input A

~A: A

~B: AC Input B

Load: Any server, storage, or

other equipment connected to
the Micro SmartSwitch

L6-30P

~ A

Dual Input

~ B

L6-30P

1

P

2

D

3

U

4

200-240 VAC

Load

Load

Load

Load

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Configuration 3

This configuration shows the use of a Micro SmartSwitch with 2-line cord
devices. In this configuration, a server is connected to each of the four segments
of the Micro SmartSwitch.

Each segment can

Note:

accommodate a maximum cur­rent draw of 10A, so the individ­ual load connected to it must not
exceed 10A or the circuit
breaker will trip.

C Input A

~A: A

L6-30P

~ A

Dual Input

~ B

L6-30P

1

P

2

D

3

U

4

Load

Load

Load

Load

200-240 VAC

~B: AC Input B

,3,4: Load segments on the

1,2

Micro SmartSwitch

Load: An
other equipment connected to
the Micro SmartSwitch

y server, storage, or

L6-30P

~ A

Dual Input

~ B

L6-30P

1

P

2

D

3

U

4

Load

Load

200-240 VAC

Configuration 4

If your facility does not have a centralized Uninterruptible Power System, then

e following configuration will provide maximum redundancy in a rack environ-

th
ment. The diagram below shows how to use three Micro SmartSwitchs, each con­nected to a UPS and a server.

Each segment can accommodate a maximum current draw of 10A, so the

Note:

individual load connected to it must not exceed 10A or the circuit breaker will
trip.

DUAL INPUT

C Input A

~A: A

~B: AC Input B

Load: Any server, storage, or

other equipment connected to
the Micro SmartSwitch

~ A
~ B

~ A
~ B

~ A
~ B

L6-30P

P
D

UPS

Load

U

P
D

UPS

Load
U

P
D

UPS

Load
U

200-240 VAC

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Liebert Micro SmartSwitch Specifications

Liebert Model Name Micro SmartSwitch

Part Number MSS30A-240

Unit Dimensions (H x W x D) in 1.72 x 17.00 x 15.25 in

(mm) (43.7mm x 432mm x 387mm)

Unit Weight: lbs.(kg) 20.0 lbs.(9.7kg)

Shipping Weight: lbs.(kg) 32.0 lbs.(14.55kg)

LED Indictors Input A (Primary) / Input B (Secondary)

Nominal Input Voltage Range 200 – 240VAC

On-Line Voltage Range 180 – 262VAC

Input Plug (2) Attached x L6-30 Plugs

Input Frequency 50/60Hz

Input Surge Rating 500J

Output Connectors (12) x IEC-320-C13

Output Circuit Breaker Protection Rating (4) x 10A

Output Power (VA) Rating 4320

Maximum Output Current 24A

Transfer Time <18ms

Environmental

Operating Temperature 0°C to 50°C (32°F to 122°F)

Storage Temperature -30°C to 60°C (-22°F to 140°F)

Relative Humidity 10 % to 80 %, non-condensing

Operating Altitude 0 to 10,000 feet above sea level

Safety and Agency

Safety Markings UL, c-UL

Safety Certifications UL1950

EMC Markings FCC

Emissions FCC Class A,

Immunity ANSI C62.41 Cat B (formerly IEEE 587)

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Micro Smart Switch

DUAL INPUT POWER DISTRIBUTION

USER MANUAL

The Company Behind the Products

With over a mil lion installations around t he globe,
Liebert is the wor ld leader in computer protect ion
systems. Since its founding in 1965, Liebert has
developed a co mplete range of support and
protection systems for sensitive electronics:

• Environmental system s—close-control air

conditioning from 1 to 60 tons

• Power conditioning and UPS with power

ranges from 30 0 VA to more than 1000 kVA

• Integrated s ystems that provide both

environmen tal and power protection in a
single, flexible package

• Monitoring and control—from systems of any

size or location, on-site or remote

• Service and support through more than 100

service cente rs around the world and a 24/7
Customer Res ponse Center

While every pr ecaution has been taken to en sure
the accuracy an d completeness of this lit erature,
Liebert Corpora tion assumes no responsibility and
disclaims all liability for damages resulting from
use of this information or for any errors or
omissions.

© 2001 Liebert Co rporation
All rights reserved throughout the world.
Specification s subject to change without no tice.

® Liebert and the Liebert logo are registered
trademarks of Liebert Corporation. All names
referred to are trademarks or registered
trademarks of their respective owners.

SL-20350 (10/01)

Technical Support

United States

1050 Dearborn Drive

P.O. Box 29186

Columbus, OH 43229

1-800-222-5877

Outside the United States

24 hours a day, 7 days a week

35028 Piove Di Sacco (PD)

[phone]

1-800-222-5877

3-Phase UPS

1-800-543-2778

Environmental Control

1-800-543-2778

Via Leonardo Da Vin ci 8

Zona Industrial e Tognana

[phone]

FAX: [phone]

23F, Allie d Kajima Bldg.

138 Glouces ter Road

[phone]

FAX: [phone]

www.liebert.com

Italy

Asia

Wanchai

Hong Kong

Web Si te

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