Vertiv Liebert MBSM, Liebert EXL S1, Liebert NX User Manual

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Liebert®

MBSM™ Multiple Bus Synchronization Module

User Manual — Liebert EXL S1 and Liebert NX 225-600kVA

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The information contained in this document is subject to change without notice and may not be suitable for all applications. While every precaution has been taken to ensure the accuracy and completeness of this document, Vertiv assumes no responsibility and disclaims all liability for damages resulting from use of this information or for any errors or omissions. Refer to other local practices or building codes as applicable for the correct methods, tools, and materials to be used in performing procedures not specifically described in this document.

The products covered by this instruction manual are manufactured and/or sold by Vertiv This document is the property of Vertiv and contains confidential and proprietary information owned by Vertiv. Any copying, use or disclosure of it without the written permission of Vertiv is strictly prohibited.

Names of companies and products are trademarks or registered trademarks of the respective companies. Any questions regarding usage of trademark names should be directed to the original manufacturer.

Technical Support Site

If you encounter any installation or operational issues with your product, check the pertinent section of this manual to see if the issue can be resolved by following outlined procedures. Visit https://www.VertivCo.com/en-us/support/ for additional assistance.

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TABLE OF CONTENTS

CONTACTING VERTIV FOR SUPPORT . . . . . . . . . . . . . . . . . . . . . . . INSIDE FRONT COVER

1.0 INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1 Concepts, Basic Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.0 INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 Transporting Without Packaging Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.3 Equipment Delivery and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.4 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.5 Configuration for 60Hz 480V AC Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.5.1 Power and Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.5.2 Selecting an Installation Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.6 Mount the Liebert MBSM on a Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.6.1 Transformer Box Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.7 Dual Bus UPS Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.7.1 Normal Operating Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

2.8 Phase Error Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.8.1 Liebert MBSM Activation on Bus A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.8.2 Liebert MBSM activation on Bus B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.9 Generator Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.9.1 Bus A Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.9.2 Bus B Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.9.3 Both Power Bus Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.9.4 Remote Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.10 Application Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.10.1 Special Solution, if Required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.11 Selecting the Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2.12 Remote Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.12.1 Excluding Bus A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.12.2 Excluding Bus B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.12.3 Excluding Bus A and B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.0 INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.1 Liebert MBSM Internal Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.0 UPS SETUP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.1 Liebert MBSM Function Activation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

4.2 Liebert MBSM Interconnections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

4.3 Power Interconnections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.4 Signal Interconnections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

4.5 Remote Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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FIGURES

Figure 1 Block diagram of a UPS system with Liebert MBSM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 2 Moving the Liebert MBSM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3 Dimensions, drilling diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 4 Connection example—Liebert MBSM, Liebert EXL S1 and transformer box . . . . . . . . . 8

Figure 5 Connection example—Liebert MBSM, Liebert NX and transformer box . . . . . . . . . . . . . 9

Figure 6 Dual-bus UPS systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 7 Synchronization Components for Dual Bus System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 8 Synchronizing to Bus A for Dual Bus System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 9 Synchronizing to Bus B for Dual Bus System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 10 Remote override to synchronize to Bus B for dual-bus system. . . . . . . . . . . . . . . . . . . . . . 14

Figure 11 Liebert MBSM connected to six UPS modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 12 Special application—Liebert MBSM connected to 11 UPS modules . . . . . . . . . . . . . . . . . 16

Figure 13 Liebert MBSM internal layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 14 Schematic diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 15 Liebert MBSM Interconnections to Liebert EXL S1 Dual Bus system. . . . . . . . . . . . . . . .20

Figure 16 Liebert MBSM Interconnections to Liebert NX Dual Bus system. . . . . . . . . . . . . . . . . . . . 21

Figure 17 Liebert MBSM Control Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Figure 18 MBSM with phase control, up to 11 units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

TAB LES

Table 1 Liebert MBSM application limits—Six UPS modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 2 Liebert MBSM application limits—11 UPS modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 3 Lamp indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

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IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS

This manual contains important instructions that should be followed during transport, installation, operation and maintenance of your Liebert MBSM or (Multiple Bus Synchronization Module). Read this manual thoroughly, paying special attention to the sections that apply to your installation, before working with the UPS system. Retain this manual for use by installing personnel.

The Liebert MBSM with phase control (10B14545G1) has been designed for operation with N+N UPS systems consisting of modules of either the Liebert EXL™ S1 or the Liebert NX™ 225-600kVA UPS. This document is not valid for any application with different UPS models.

Read and follow all warnings, cautions and notices in this document and comply with all national and local codes and practices.

WARNING

Risk of electrical shock. Can cause personal injury and death. Special safety precautions are required for procedures involving handling, installation and

maintenance of the Liebert MBSM. Only properly trained and qualified personnel wearing appropriate personal protective equipment should be involved in installing, operating or maintaining the Liebert MBSM or preparing the system for installation.

Be constantly aware that the Liebert MBSM contains high voltages. Check for voltage with AC and DC voltmeters before making contact.

Observe all safety precautions before working on or near the Liebert MBSM or the UPS system.

WARNING

Risk of electric shock. Can cause personal injury and death. In case of fire involving electrical equipment, use only carbon dioxide fire extinguishers or those approved for use in fighting electrical fires.

WARNING

Risk of heavy unit falling over. Can cause equipment damage, injury and death. Exercise extreme care when handling the Liebert MBSM to avoid equipment damage or

injury to personnel. The Liebert MBSM weighs 150 lb. (66kg).

Locate center of gravity symbols and consider the unit weight before handling the Liebert MBSM. Test lift and balance the unit before transporting it. Maintain minimum tilt from vertical at all times.

WARNING

Risk of electric shock. Can cause property damage, injury and death. Hazardous voltages exist in the Liebert MBSM. The front panel must not be removed while

the UPS system is energized. If, for any reason, it is necessary to remove this panel, the entire system must be switched Off and de-energized. Check for voltage with AC and DC voltmeters to verify that the system is de-energized before working within.

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WARNING

Risk of electric shock. Can cause property damage, injury and death. When the Liebert MBSM is closed, parts that carry voltage must not be touched. After

removing the protective panels or terminal field covering, the connection terminals and rails, as well as exposed metal parts and other components carrying dangerous voltages are no longer protected against accidental contact. Safety measures must be observed when working on an open UPS or accessory.

WARNING

Risk of electric shock. Can cause equipment damage, injury and death. The area around the Liebert MBSM must be kept free of puddles of water, excess moisture and debris. This equipment contains circuits that are energized with high voltage. Only test equipment designed for troubleshooting should be used. This is particularly true for oscilloscopes. Always check with an AC and DC voltmeter to ensure safety before making contact or using tools. Even when the power is turned Off, dangerously high potential electric charges may exist in the Liebert MBSM. All power and control wiring must be installed by a properly trained and qualified electrician. All power and control wiring must comply with the NEC and applicable local codes. When performing maintenance with any part of the equipment under power, service personnel and test equipment must be standing on rubber mats. The service personnel must wear insulating shoes for isolation from direct contact with the floor (earth ground). One person should never work alone, even if all power is disconnected from the equipment. A second person should be nearby to assist and to summon help in case of an accident.

NOTE

Materials sold hereunder cannot be used in the patient vicinity (e.g., use where UL, cUL or IEC 60601-1 is required). Medical applications such as invasive procedures and electrical life support equipment are subject to additional terms and conditions.

NOTICE

Overvoltage Protection: The Liebert MBSM must be protected against overvoltages deriving from input

utility supply. The device was developed in accordance with the product normative IEC EN 62040-2, which relates to the IEC 1000-4-5. Overvoltages must be planned for in the power supply system, including those caused by lightning strikes and those produced internally as the result of switching inductive or capacitive loads, such as power transformers or capacitor banks, or as the result of shortcircuit shutdowns.

In addition to the warnings, cautions and notices in this document, pay particular attention to the following:

• When selecting a location for the device and before operation, observe the notices concerning environmental conditions.

• When disconnecting input power, the connected loads continue to be supplied with voltage by the battery, and return voltage is present at the input terminals of the UPS.

• Data transfer cables must not be connected or disconnected during thunderstorms.

• Ensure that no objects (e.g., metal shavings, screws, etc.) are left inside of the device.

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EC Declaration of Conformity

The Liebert MBSM is in conformity with the protection and safety objectives of the following European directives:

• 2006/95/EC

Directive of the council for adaptation of the legal regulations of the member states regarding electrical equipment for use within specific voltage limits (superseding the 73/23/EC and successive amendments).

• 89/336/EC

Directive of the council for adaptation of the legal regulations of the member states regarding electromagnetic compatibility, modified by directive 91/263/EC, 92/31/EC and 93/68/EC.

Conformity is established through compliance with the following standards:

• IEC EN 62040-1-2

• IEC EN 62040-2

• IEC EN 62040-3

UL Listing

cUL US listed Industrial Control Panel Enclosure E160992

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1.0 INTRODUCTION

Transformer

Box

Liebert MSBM

UPS B

UPS A

UPS C

Fr Signal

Incoming

Source = 3P+N

This device is used to maintain voltages from two separate sources in phase. This function increases the energy availability at the output of the static transfer system, while the synchronized sources upstream of the device are always available for transfer. It complies with all relevant safety regulations governing information technology equipment.

The Liebert MBSM is designed to provide a frequency reference signal for up to 11 UPS modules, depending on the model. This signal is a square wave generated by an incoming source reference or by an internal quartz oscillator. Each UPS connected to the Liebert MBSM is able to receive the frequency reference signal and, under particular conditions, to automatically phase lock the inverter to this reference.

1.1 Concepts, Basic Architecture

Figure 1 shows the typical block diagram of a UPS system with Liebert MBSM.

Figure 1 Block diagram of a UPS system with Liebert MBSM

Each UPS in the system is supplied by a common electrical bus; the UPS synchronization source (reference) is the power source connected on its reserve input and, as a consequence, being the power source common to all the UPS, the inverters outputs will be in synchronization.

When the main power (reserve inputs) fail, each UPS will synchronize the inverter to the signal coming from the Liebert MBSM (Fref.) and, as a result, the inverters will remain synchronized. Should the Fref. not be available (or the Liebert MBSM not be installed), each UPS will synchronize to its own internal quartz oscillator. That would make the inverters outputs asynchronous.

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The Liebert MBSM has a simple, passive role in relation to the UPS. The UPS will decide on the source of synchronization on the following priority scale:

• Highest Priority = Local Reserve Input

• Medium Priority = Liebert MBSM Reference

• Lowest Priority = Local Quartz Oscillator

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2.0 INSTALLATION

2.1 Unpacking NOTICE

The Liebert MBSM should be unpacked where it will be installed. Leaving the packaging intact protects the Liebert MBSM during transportation.

To unpack the Liebert MBSM:

1. Check the Liebert MBSM for damage and, if any is found, inform the shipper and. if necessary, your Vertiv agent.

2. Check the nameplate on the Liebert MBSM against the delivery papers and the bill of lading to determine whether all ordered parts were delivered.

3. Loosen the fastening screws on the pallet.

4. Lift the Liebert MBSM from the pallet.

5. Keep the pallet for repackaging or transportation; dispose of the remaining packaging material in accordance with local regulations

2.2 Transporting Without Packaging Materials

The cabinets can easily be moved to their final destinations with lifting devices.

WARNING

Irregularities in the floor can block the fork lift or cause the Liebert MBSM to bounce off the forks. Moving the cabinets too quickly can damage them, causing them to fall over and injure personnel.

WARNING

Whenever the devices are moved they must be secured against sideways tipping.

2.3 Equipment Delivery and Storage

WARNING

Pay attention to the markings indicating the center of gravity of the device. Use suitable means of transportation and secure the UPS against tipping over when transporting. Improper transportation can result in damage to the UPS and battery cabinet as well as injury to personnel.

The Liebert MBSM is shipped on a pallet measuring 31.5" x 47.25" x 7.87" (800mm x 1200mm x 200mm), and secured by four bolts inserted through its mounting brackets. It is wrapped in protective plastic sheeting and supported by protective brackets. The crated Liebert MBSM measures 31.5" x 47.25" x 19.68" (800mm x 1200mm x 500mm and weighs

145.5 lb. (66kg).

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2.4 Storage

If the Liebert MBSM will not be installed immediately, the unit may be kept in its original packaging in the conditions noted in 2.5.2 - Selecting an Installation Site

Figure 2 Moving the Liebert MBSM

2.5 Configuration for 60Hz 480V AC Applications

2.5.1 Power and Sensing

For 480V 60Hz delta 3-wire plus ground operation, as in the Liebert NX™ 225-600, the Liebert MBSM auxiliary power and reference sensing voltages must be transformed to 230V singlephase and 415V wye 4-wire plus ground, respectively. This is done via a separate transformer box provided by Vertiv, Part #552792G1.

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2.5.2 Selecting an Installation Site

The installation site must meet the following conditions:

• Ambient temperature—The ambient temperature should be between 32°F to 104°F (0°C to 40°C).

• Environmental conditions

•No vibration

• Negligible dust

• Non-corrosive atmosphere

•low humidity

• Space requirements

• no required access on either side of the device

2.6 Mount the Liebert MBSM on a Wall

WARNING

If the area where the Liebert MBSM will be installed contains more than 6.6 gal. (25 liters) of inflammable liquids, refer to HD 384.4.42 S1 A2, Chapter 42 (corresponds to DIN VDE 0100, Part 420), the area must be contained so that burning liquids or their combustion products could not spread through the building.

The Liebert MBSM can be wall-mounted, using factory-hangers shown in Figure 3. Attach the Liebert MBSM to wall studs or other features that can bear its weight. The unit weighs almost 125 lb. (56kg).

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Figure 3 Dimensions, drilling diagram

31.5"

(800mm)

32.7"

(830mm)

Detail A

23.6" (600mm)

21.5" (545mm)

FRONT

Nr. 4 Slot

0.33" x 0.57 ")

(8.5 x 14 .5 mm

Bus A Active

Bus B Active

Forced

Bus A

Forced

Bus B

System OK

System

Fault

Priority A Autom. Priority B

9.9"

(250mm)

SIDE

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2.6.1 Transformer Box Connections

UPS Module 1

AP30-XP31

UPS Module 2

UPS Module X

Transformer Box

Control Power

Reference Inputs

415V 3 -Phase

4-Wire + Gnd

230V 1 -Phase

Critical Output

Bus B

Critical

Output Bus A

480V 3-Phase

3-Wire + Gnd

Bypass

Input Line A

Bypass

Input Line B

RJ11 RJ11 RJ11

...

XT1

MSBM Box

XP1

...

XPxXP2

AP30-XP31 AP30-XP31

Figures 4 and 5 show the connections between the Liebert MBSM, UPS(s), and transformer box (the UPS module Bus A versus B assignments are examples only):

Figure 4 Connection example—Liebert MBSM, Liebert EXL S1 and transformer box

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Figure 5 Connection example—Liebert MBSM, Liebert NX and transformer box

UPS

Module 1

X20

UPS

Module 2

X20

UPS

Module X

X20

XPxXP2XP1

XT1

MSBM Box

Transformer Box

Control Power

Reference Inputs

415V 3-Phase

4-Wi re + Gnd

230V 1-Phase

Critical Output

Bus B

Critical

Output Bus A

480V 3-Phase

3-Wire + Gnd

Bypass

Input Line A

Bypass

Input Line B

...

RJ11 RJ11 RJ11

...

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2.7 Dual Bus UPS Systems

Load 2

Load 1

STS 1

STS 2

Liebert MSBM

Dual Bus

Gen

TRA TRB

UPS

System A

UPS

System B

Secure

Bus A

Secure

Bus B

Many modern solutions for critical loads power supply are designed following the dual-bus architecture (see Figure 6).

This structure is composed basically by two UPS systems (N+N) supplied by two independent power sources. The two systems outputs are connected to a number of static transfer switches that provide the automatic selection of one of the two UPS sources to the critical loads.

The static transfer switch transient will not affect the critical load if the UPS sources are synchronized.

Figure 6 Dual-bus UPS systems

Figure 7 illustrates the main synchronization function components from the system shown in Figure 6.

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Figure 7 Synchronization Components for Dual Bus System

UPS

System A

UPS

System B

MSBM

Auto

Power Bus A

Power Bus B

Secure

Bus B

Secure

Bus A

System A CNTRL

System B CNTRL

Bus B Remote CNTRL

Bus A Remote CNTRL

Frequency Reference

2.7.1 Normal Operating Condition

During normal operation it is assumed that commercial power is present both on Bus A and Bus B and UPS systems A an B running. Each UPS system performs, in real time, the analysis of the commercial power present on the relative bus (amplitude and frequency) and gives a feedback signal to the Liebert MBSM confirming the availability of the bus within the specific electrical limits.

If one UPS system is shut down, the power bus control is not available: Under this condition, the power bus related to the UPS system that is shut down is always considered inside limits (feedback signal to the Liebert MBSM locked to OK condition).

The Liebert MBSM will select one of the two buses to generate the frequency reference. The reference bus selection is random if both of them are inside preset limits. A manual selector on the Liebert MBSM permits a priority on one specific bus. This manual selector has three positions:

• Automatic (no priority)

• Priority on Bus A.

• Priority on Bus B.

Should the selected bus fail, the Liebert MBSM will automatically select the other bus independently from the preferred source selection.

If neither bus is available (not present at all or declared out of limits by the UPS systems), the Liebert MBSM will source the frequency reference by an internal quartz oscillator tuned on the system nominal frequency.

2.8 Phase Error Control

During normal operation, each UPS system will synchronize its inverter output to the input power bus; the Liebert MBSM will constantly monitor the phase error between the two buses making an indirect measure of the phase difference between the two secure buses.

Should the phase error overtake a preset limit (customizable from 5° to 15°), the Liebert MBSM will switch to the active mode of operation.

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Page 18

2.8.1 Liebert MBSM Activation on Bus A

UPS

System A

UPS

System B

MSBM

Power Bus A

Power Bus B

Secure

Bus B

Secure

Bus A

System A CNTRL

System B CNTRL

Bus B Remote CNTRL

Bus A Remote CNTRL

Frequency Reference

Both the power buses are inside limits and the Liebert MBSM is set on the Bus A; this means that the frequency reference generated by the Liebert MBSM is actually phase referred to the Bus A. If the phase difference between the two buses is detected over the set limit, the Liebert MBSM will send a signal to the UPS system B forcing it to synchronize to the generated frequency reference (see Figure 8).

The UPS A is naturally synchronized with its incoming Bus A, while UPS B is forced by the Liebert MBSM to sync the frequency reference generated on the Bus A phase reference. The UPS B is actually out of sync with its own input power bus. UPS B can transfer the critical Bus B on static bypass input (input power Bus B) but this will cause a critical bus interruption of 20ms.

Figure 8 Synchronizing to Bus A for Dual Bus System

Should the phase error between the two power buses return to the required condition, the Liebert MBSM will release the CNTRL command, letting System B return to natural operation (Liebert MBSM returns to passive operation).

2.8.2 Liebert MBSM activation on Bus B

Both the power buses are inside limits and the Liebert MBSM is set on the Bus B; this means that the frequency reference generated by the Liebert MBSM is actually phase referred to the Bus B. If the phase difference between the two buses is detected over the set limit, the Liebert MBSM will send a signal to the UPS system A forcing it to synchronize the generated frequency reference (Figure 9). The UPS B is naturally synchronized with its incoming Bus B, while UPS A is forced by the Liebert MBSM to sync the frequency reference generated on the Bus B phase reference. The UPS A is actually out of sync with its own input power bus. Should the UPS A be in need to transfer the critical Bus A on static bypass input (input power Bus A), this will be possible with limited critical bus interruption (20ms).

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Page 19

Figure 9 Synchronizing to Bus B for Dual Bus System

UPS

System A

UPS

System B

MSBM

Power Bus A

Power Bus B

Secure

Bus B

Secure

Bus A

System A CNTRL

System B CNTRL

Bus B Remote CNTRL

Bus A Remote CNTRL

Frequency Reference

Should the phase error between the two power buses naturally come back to set limits, the Liebert MBSM will release the CNTRL command letting the system A return to natural operation (Liebert MBSM back to passive operation).

2.9 Generator Operation

If the two power buses are provided by generator backup (see Figure 6), the system behavior is as follows:

2.9.1 Bus A Failure

If power Bus A fails during normal operation: the Liebert MBSM will automatically select the power Bus B letting the UPS system A to synchronize the available power Bus B through the frequency reference. If after a while, the faulty power Bus A is powered back by the generator, the Liebert MBSM will sense that this new source is not synchronous (normally that is) with the power Bus B and will keep the system A forced on frequency reference sync. This automatic behavior is possible only if the local priority switch is in automatic position. Under these conditions, the Liebert MBSM is naturally capable of preferring the commercial power Bus B as a synchronization source instead of the generator without external commands needed.

This scenario is represented by Figure 9 and corresponds to the Liebert MBSM Bus B activation.

2.9.2 Bus B Failure

If the power Bus B totally fails during normal operation: the Liebert MBSM will automatically select the power Bus A letting the UPS system B to synchronize the available power Bus A through the frequency reference. If after a while, the faulty power Bus B is powered back by the generator, the Liebert MBSM will sense that this new source is not synchronous (normally that is) with the power Bus A and will keep the system B forced on frequency reference sync. This automatic behavior is possible only if the local priority switch is in automatic position. Under these conditions, the Liebert MBSM is naturally capable of preferring the commercial power Bus B as a synchronization source instead of the generator without external commands needed.

This scenario is represented by Figure 8 and corresponds to the Liebert MBSM Bus A activation.

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Page 20

2.9.3 Both Power Bus Failure

Should both power buses be replaced by generator after a fault sequence of both the power buses, the Liebert MBSM will do the following:

• If local priority switch is on auto, the Liebert MBSM will select one of the two generators as a source for system synchronization.

• If local priority switch is on a preferred source, that source will be selected, unless the voltage and frequency values are outside preset limits; under this last condition the second available source will be selected anyway, independently from the switch position.

• If both sources are detected outside set limits, the Liebert MBSM will generate the frequency reference by the local quartz oscillator.

• If the two power buses are supplied from a common generator and inside set limits, the Liebert MBSM will operate as per normal conditions and checks

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2.9.4 Remote Commands

UPS

System A

UPS

System B

MSBM

Power Bus A

Power Bus B

Secure

Bus B

Secure

Bus A

System A CNTRL

System B CNTRL

Bus B Remote CNTRL

Bus A Remote CNTRL

Frequency Reference

During particular operating conditions (such as the generator supply), there are two remote commands available: each command is capable to exclude one power bus reference overriding the Liebert MBSM controls and forcing the related UPS system to phase lock the Liebert MBSM frequency reference. If both the power buses are excluded by the remote commands, the UPS systems will phase lock the frequency reference self-generated by the Liebert MBSM internal quartz oscillator. Figure 10 shows an example of Bus A remote control activation.

Figure 10 Remote override to synchronize to Bus B for dual-bus system

2.10 Application Limits

The Liebert MBSM with phase control (10B14545G1) is applicable to systems with up to six UPS modules.

Table 1 Liebert MBSM application limits—Six UPS modules

Combinati

A5 1

B4 2

C3 3

D2 4

E1 5

Vertiv™| Liebert® MBSM™ User Manual | 17

Bus A

Maximum

UPS Number

Maximum

UPS Number

Bus B

Page 22

Figure 11 Liebert MBSM connected to six UPS modules

Liebert MBSM

10B14545G1

UPS #1

UPS #2

UPS #3

UPS #4

UPS #5

UPS #6

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Page 23

2.10.1 Special Solution, if Required

Liebert MBSM

10B14545G2

UPS #1

UPS #2

UPS #3

UPS #4

UPS #5

UPS #6

UPS #7

UPS #8

UPS #9

UPS #10

UPS #11

Note that the maximum number of UPS’s in modular parallel is

A special version of the Liebert MBSM (10B14545G2) with phase control is available for applications with up to 11 UPS modules.

Table 2 Liebert MBSM application limits—11 UPS modules

Combinati

A8 3

B7 4

C6 5

D5 6

E4 7

F3 8

Bus A

Maximum

UPS Number

Figure 12 Special application—Liebert MBSM connected to 11 UPS modules

Bus B

Maximum

UPS Number

2.11 Selecting the Priority

Use the selector switch on the front panel to set the operating mode:

• AUTOMATIC (AUTOM.)—Liebert MBSM detects the reference bus automatically, without assigning a priority; the first bus to be detected is selected as the reference.

• PRIORITY BUS A (PRIORITY A)—If Bus A is present it is selected as priority source. If Bus A is not present, the Liebert MBSM selects Bus B, if present.

• PRIORITY BUS B (PRIORITY B)—If Bus B is present it is selected as priority source. If Bus B is not present, the Liebert MBSM selects Bus A, if present.

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Page 24

2.12 Remote Commands

There are two normally open inputs provided on XT1 for remote commands. These inputs are biased at 230VAC. Relays used to close them must be rated accordingly.

2.12.1 Excluding Bus A

When the corresponding terminal voltage-free contact is closed, the Liebert MBSM is forced onto Bus B and the UPS A system follows the reference signal generated by the Liebert MBSM.

2.12.2 Excluding Bus B

When the corresponding terminal voltage-free contact is closed, the Liebert MBSM is forced on to Bus A and the UPS B system follows the reference signal generated by the Liebert MBSM.

2.12.3 Excluding Bus A and B

When both contacts are closed, the Liebert MBSM reference signal is generated by an internal quartz oscillator. Both UPS systems will follow the reference signal generated by the Liebert MBSM.

Table 3 Lamp indications

Normal

Lamp Title

Bus A Active Off

Bus B Active Off

L1 System OK On System OK —

L2 System Fault

Forced Bus A Off

Forced Bus B Off

Condition Non-Condition

On indicates synchronization on Bus A and Bus B forced to A due to buses OOS detected

On indicates synchronization on Bus B and Bus A forced to B due to buses OOS detected

Off On when both buses not available or system fault

On indicates synchronization on Bus A and Bus B forced to A by external command

On indicates synchronization on Bus B and Bus A forced to B by external command

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Page 25

3.0 INSTALLATION

Input Fuses

Contactors

Timers

AP1

System

Synchronization

Control

15B10777G2

AP2

SSW CTRL

15B10890G1

AP3

Synchronism

Detector

15B10889G1

Terminals XT1

Auxiliary Supply Relays Logic

3.1 Liebert MBSM Internal Layout

Figure 13 Liebert MBSM internal layout

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Page 26

Figure 14 Schematic diagram

UPS1

AP1

UPS2

AP1

UPS3

AP1

UPS4

AP1

UPS5

AP1

UPS6

AP1

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

R4/1 R4/2

R4/3

R4/1

R4/2

R4/3

Priority Actived

Bus A

Selected

Bus B

Selected

64 6 7

RHA/1 RHA/2 RHA/3

RHB/1 RHB/2 RHB/3

RPA/2

RPB/2

RSA/3

RSB/3

567

050607

F5F6F7

3 x Fuse 6A

123

567

010203

Link

3 x Fuse 6A

13141516171819

A1 B1

010

011

012

171819

F12

F11

F10

101112

33 3 5

From Output Busbar 1

From Output Busbar 2

220-240V/50-60Hz

2 x Fuse 4A

TM1

TM2

XT1

2 x Fuse 4A

R6/4R4/4

124

1234567

AP3

12345

341

414243

System OK

System Faul t

AP2

FL 34W

7PL

AP1

Liebert MBSM with Phase Control

(up to 6 UPS Modules)

RP A

RP B

RHB

RHA

SW1 /1 SW1 /2

R2/2

41A

On the

Door

43A

42A

R1/2

RSA/2

R2/3

R1/3

037

038

* From UPS A Reserve OK

Cl ose For ced o n S ource B

Close Forced on Source A

* From UPS B Reserve OK

R4 R2 R6

Bu s B

Active

Forced

Bus A

131415

12345

135

RJB1RJA1

RJC 1

RJD 1 RJE 1 RJF1

RPB /1

RPA/1

21 25

R1/1

RSA/1

2927

R2/1

K2 K1

K1RSA

K2RS BT2

From Reserve

Input Line A

380=415V/50-60Hz

From Reserve

Input Line B

380=415V/50-60Hz

Bus A

Act ive

RSB/1

XT1

OFF OFF Automatic

Input A / In put B = OK

R1 = R2 = ON

SW1/1 SW1/2 Priority

ON OFF P = A

OFF ON P = B

Forc ed

Bus B

Inhibit UPS A/1

Inhibit UPS A/2

Inhibit UPS A/3

Inhibit UPS B/1

Inhibit UPS B/2

Inhibit UPS B/3

Priority Actived

Bus B

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Page 27

4.0 UPS SETUP

Input Line A

Force Source B

Force Source A

XT15 XT16

XT19 XT20

XP1

XP2

XP6

MBSM

With

Phase Control

Input Line A

Power System B Single UPS

UPS B

BUS B

Digital Input

INHBIT UPS A1

INHBIT UPS A2

INHBIT UPS A3

INHBIT UPS B1

INHBIT UPS B2

INHBIT UPS B3

BUS A

UPS A1

AP30-XP31

Digital Input

UPS A2

Digital Input

Power System A Two UPS’s in Parallel Configuration

Digital Input : EXL S1 = AP30 or AP 202-XP11

Sync

AP30-XP31

Each UPS comprising System A and System B must be set up via PPVis according to the following.

4.1 Liebert MBSM Function Activation

If the Liebert MBSM installation is going to be done on a UPS system already in service and the synchronization functionality was not present before, a detailed procedure by qualified Vertiv personnel is required.

4.2 Liebert MBSM Interconnections

Figure 15 Liebert MBSM Interconnections to Liebert EXL S1 Dual Bus system

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Page 28

Figure 16 Liebert MBSM Interconnections to Liebert NX Dual Bus system

Input Line A

Force Source B

Force Source A

XT15 XT16

XT19 XT20

XP1

XP2

XP6

MBSM

With

Phase Control

Input Line A

Power System B Single UPS

UPS B Sync

BUS B

Digital Input

INHBIT UPS A1

INHBIT UPS A2

INHBIT UPS A3

INHBIT UPS B1

INHBIT UPS B2

INHBIT UPS B3

BUS A

UPS A1

Sync

Digital Input

UPS A2

Sync

Digital Input

Power System A Two UPS’s in Parallel Configuration

Digital Input : NX225 -600 = TB1

Figures 15 and 16 are examples of a dual-bus system composed of a modular parallel on Bus A and a single unit on Bus B.

4.3 Power Interconnections

The Liebert MBSM is powered by the two main buses and from the two critical buses (UPS outputs).

Main Bus A is a three phase +N line from the Transformer Box Reference Output (as shown in

2.6.1 - Transformer Box Connections) to be interconnected to the Liebert MBSM XT1 terminals 1[a], 2[b], 3[c] and 4[N]. The phase sequence MUST be the same of the UPS A reserve input. Suggested wire size is 14AWG, protected with 10A Class CC fuse.

Main Bus B is a three phase +N line from the Transformer Box Reference Output (as shown in

2.6.1 - Transformer Box Connections) to be interconnected to the Liebert MBSM XT1 terminals 5[a], 6[b], 7[c] and 8[N]. The phase sequence MUST be the same of the UPS B reserve input. Suggested wire size is 14AWG, protected with 10A Class CC fuse.

AUX supply A is a single phase line coming from the UPS A output via the Transformer Box Control Power (as shown in 2.6.1 - Transformer Box Connections), to be interconnected to the Liebert MBSM XT1 terminals 9[L] 10[N]. Suggested wire size is 14AWG, protected with 10A Class CC fuse.

AUX supply B is a single phase line coming from the UPS B output via the Transformer Box Control Power (as shown in 2.6.1 - Transformer Box Connections), to be interconnected to the Liebert MBSM XT1 terminals 11[L] 12[N]. Suggested wire size is 14AWG, protected with 10A Class CC fuse.

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Page 29

4.4 Signal Interconnections

UPS inhibition signals are contacts present in the Liebert MBSM to be wired to each digital input of each UPS installed.

Bus A UPS digital input must be wired to the Liebert MBSM outputs XT1 from 21 to 26. Bus B UPS digital input must be wired to the Liebert MBSM outputs XT1 from 27 to 32. See also Figures 15 and 16 red signal interconnections. Suggested wire size is 16AWG.

Frequency reference signals are signals available on the Liebert MBSM RJ-45 plugs XP1~ XP6. Each UPS is equipped with an RJ-45 on the control PCB. Each UPS RJ-45 must be interconnected to an RJ-45 XPx plug on the Liebert MBSM using a cable with the following characteristics:

• cable type: category 5 shielded flexible stranded

• wires: 4 x 2 x AWG24 copper cable

• shielding: aluminum/polyester

• impedance: 100Ohm

• connectors: 2 x shielded RJ-45 plugs

• connections: pin-to-pin

As the length of these cables depends upon the UPS system layout, these cables are not normally supplied by Vertiv. For this interconnection use only shielded RJ-45 cables and, possibly, do not run these cables in the same conduit where the power cables are running. The max theoretical length of each frequency reference cable should not exceed 100m.

4.5 Remote Contacts

Two remote contacts are available for the customer to use:

• Bus A forced = XT1 19-20

• Bus B forced = XT1 15-16

If these remote contacts/commands are not used, leave the mentioned terminals not wired. Once these inputs are open, the Liebert MBSM will logically behave normally.

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Page 30

7PL

AP2

Board

CHL0413170

System OK

System Fault

341

44 -

43 +

42 -

41 +

XP1 XP2 XP3 XP 4 XP3 XP 4

RJ-45RJ-45RJ-45RJ-45RJ-45RJ-45

RJ-45

XP7

135

AP1

UPS5

AP1

UPS4

AP1

UPS3

AP1

UPS2

AP1

UP S1

Liebert MBSM with Phase Control

(Up to 11 UPS Modules)

Intern al Cable Size: 1.5mm

3.H 2

K2RSBT2 K2RSB

567

13141516171819

RPA

RP B

RHA1RHB

RHB1 RH A

R1/3

R2/3

12345

RSB/1

Bus B

Active

01020304050607

Bus A

Active

01020304050607

F1F2F3

F5F7F6

Link

3 x Fuse 5A

3 x F us e 5A

R1/2

R2/2

RSA/2

Forced

Bus A

R6/1

SW1/1

SW1/2

On the

Door

43A

41A

42A

R2 R6 R7

33 3 3 33

Forced

Bus B

R1 R4 R5

30 32 32

R4/1

2 x Fuse 4A

091110

F11

F10

F12

091110

171918

2 x Fuse 4A

TM1

TM2

AA1A

BB1B

R1/1

RSA/1

R2/1

RPB/1

RPA/1

1234567

AP3

Synchronism Detector

(P.N. 15B10889G1)

Dwg. 15H70853

AP1

Sy st em S ync hro nizat io n

Control B oard

(P.N. 15B10777G2)

Dwg. 15H70783

124

[4.F9][4.F9]

131415

XT1

From Output Busbar 1

From Output Busbar 2

220-240/50-60Hz

(L)

(M)

From UPS A Reserve OK

Fr om UPS B Re ser ve OK

Close Forced on Source B

Close Forced on Source A

From Reserve

Inp ut Li ne A

380-415/50-60Hz

From Reserve

Inp ut Li ne B

380-415/50-60Hz

(W)

(U)

(V)

(N)

(W)

(U)

(V)

(N)

123

Refe rence B us

Inpu ts

Contro l Power

(1 Inp ut fr om Eac h

Critical Bus Output)

OFF OFF Automatic

Input A / Input B = OK

R1 = R2 = ON

SW1 SW2 Priority

ON OFF P = A

OFF ON P = B

10H72985

Pg. 3, Rev. 1

Figure 17 Liebert MBSM Control Module

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Page 31

Figure 18 MBSM with phase control, up to 11 units

21 22 23 24 25 26 210 220 230 240 250 260 27 28 29 30 31 32 270 280 290 300 310 320 33 34 35 36 37 38 39 40 41 42 43 44

48 50 460 480 500 52 54 56 540520 560 59

58 61

RJ-45

XP7

[3.L3]

RJ45

UPS7

AP1

UPS6

AP1

UPS8

AP1

UPS9

AP1

UPS10

AP1

UPS11

AP1

5 4 2 1

10H72985 Pg. 4, Rev. 1

Bus B

Selected

Bus A

Selected

Priority Actived

Bus A

Priority Actived

Bus B

Inhbit UPS B/6

Inhbit UPS B/5

Inhbit UPS B/4

Inhbit UPS B/3

Inhbit UPS B/2

Inhbit UPS B/1

Inhbit UPS A/6

Inhbit UPS A/5

Inhbit UPS A/4

Inhbit UPS A/2

Inhbit UPS A/1

Inhbit UPS A/3

RH/1 RH/2 RH/3 RH/1 RH/2 RH/3 RH/1 RH/2 RH/3 RH/1 RH/2 RH/3 RH/2 RH/2 RH/3 RH/2

XT1

R4/2 R4/3 R4/4 R5/2 R5/3R5/1 R6/2 R6/3 R6/4 R7/2 R7/3R7/1

49 470450 53490 51 55 510 57 60 63 66530

550

AP10

SYSTEM SYNCHRONIZATION

CONTROL BOARD (P.N. 15B10777G2)

DWG. 15H70783

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Page 32

Notes

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Page 33

Page 34

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