Gtec MUST400 User manual

MUST400_User manual_EN_REV02 User Manual - 1 -
Modular UPS MUST400
USER Manual

Safety Precautions
- 2 - MUST400_User manual_EN_REV02 User Manual
Safety Precautions
This manual contains information concerning the installation and operation of Modular UPS. Please carefully read this
manual prior to installation.
The Modular UPS cannot be put into operation until it is commissioned by engineers approved by the manufacturer (or its
agent). Not doing so could result in personnel safety risk, equipment malfunction and invalidation of warranty.
The UPS has been designed for commercial or industrial use only, and is not intended for use in any life support application.
This is a CLASS C Uninterruptible Power Supply (UPS) product. In a domestic environment, this product may cause radio
interference, in which case, the user may be required to take additional measures.
Conformity and standards
This product complies with 2006/95/EC ,CE73/23 & 93/68 (low voltage safety) and 2004/108/EC, 89/336 (EMC), and the
following UPS product standards:
*IEC62040-1 General and safety requirements for use in operator access area
*IEC/EN62040-2 EMC requirements CLASS C
*IEC62040-3 Performance requirements and test methods
Continued compliance requires installation in accordance with these instructions and the use of manufacturer approved accessories
only.
WARNING: high earth leakage current
Earth connection is critical before connecting the input supply (include both utility supply and battery).
"Earth leakage current introduced by the UPS, in any configuration from 10kW to 200kW, exceeds 3.5 mA and is less than 1000
mAand complies with the requirements of IEC/EN 62040-1 / IEC/EN 60950-1" Transient and steady-state earth leakage currents,
which may occur when starting the equipment, should be taken into account when selecting instantaneous RCCB or RCD devices.
Residual Current Circuit Breakers ( RCCBs) must be selected sensitive to DC (class B) and insensitive to transient current pulses
Type S.
Note also that the earth leakage currents of the load will be carried by this RCCB or RCD.
This equipment must be earthed in accordance with local electrical authority codes of practice.
WARNING: backfeeding protection
This system has a control signal available for use with an automatic device, externally located, to protect against backfeeding
voltage through the mains Static Bypass circuit. If this protection is not used with the switchgear that is used to isolate the bypass
circuit, a label must be added to the switchgear to advise service personnel that the circuit is connected to a UPS system.
The text has the following meaning or is equivalent to: Isolate the UPS before working on the circuit of this UPS.
Components that can be maintained by user
All the equipment maintenance and servicing procedures involving internal access need special tools and should be carried out
only by trained personnel. The components that can only be accessed by opening the protective cover with tools cannot be
maintained by user.
This UPS full complies with “IEC62040-1-1-General and safety requirements for use in operator access area UPS”. Dangerous
voltages are present within the battery box. However, the risk of contact with these high voltages is minimized for non-service
personnel. Since the component with dangerous voltage can only be touched by opening the protective cover with a tool, the
possibility of touching high voltage component is minimized. No risk exists to any personnel when operating the equipment in the
normal manner, following the recommended operating procedures in this manual.
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MUST400_User manual_EN_REV02 User Manual - 3 -
Battery voltage higher than 400Vdc
All the battery maintenance and servicing procedures involving internal access need special tools or keys and should be carried out
only by trained personnel.
SPECIAL CARE SHOULD BE TAKEN WHEN WORKING WITH THE BATTERIES ASSOCIATED WITH THIS
EQUIPMENT.
WHEN CONNECTED TOGETHER, THE BATTERY TERMINAL VOLTAGE WILL EXCEED 400Vdc AND IS
POTENTIALLY LEATHAL.
Battery manufacturers supply details of the necessary precautions to be observed when working on, or in the vicinity of, a large
bank of battery cells. These precautions should be followed implicitly at all times. Particular attention should be paid to the
recommendations concerning local environmental conditions and the provision of protective clothing, first aid and fire-fighting
facilities.
THE NON-COMPLIANCE WITH THE REQUIREMENTS PRESENT IN THIS MANUAL WILL VOID THE
WARRANTY.
THE WARRANTY IS VOID IF THE INTERVENTIONS AND/OR MODIFICATIONS ARE EXECUTED BY
UNAUTHORIZED PERSONNEL.
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Contents
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Contents
Safety Precautions...............................................................................................................................- 2 -
Chapter 1 Installation.............................................................................................................................. 7
1.1 Introduction............................................................................................................................. 7
1.2 Initial Checking....................................................................................................................... 7
1.3 Location................................................................................................................................... 8
1.3.1 UPS Location.............................................................................................................. 8
1.3.2 External Battery Room............................................................................................... 8
1.3.3 Storage......................................................................................................................... 9
1.4 Positioning .............................................................................................................................. 9
1.4.1 System Cabinet ........................................................................................................ 10
1.4.2 Moving the Cabinets................................................................................................ 10
1.4.3 Distances Required for Operating.......................................................................... 10
1.4.4 Front Access & Rear access................................................................................... 10
1.4.5 Final Positioning ....................................................................................................... 10
1.4.6 Installation ofAdjustable Feet................................................................................. 10
1.4.7 UPS Composition..................................................................................................... 10
1.4.8 Installing Power Modules and Battery Modules................................................... 12
1.4.9 Cable Entry................................................................................................................ 13
1.5 External Protective Devices............................................................................................... 13
1.5.1 Rectifier and Bypass Input Supply of the UPS..................................................... 13
1.5.2 External Battery........................................................................................................ 14
1.5.3 UPS Output............................................................................................................... 14
1.6 Power Cables....................................................................................................................... 15
1.6.1 Cable Connections................................................................................................... 16
1.7 Control Cabling and Communication................................................................................ 17
1.7.1 UPS Dry Contact GJ and Monitoring Board FK Features.................................. 17
1.7.2 Dry Contact Interface of Battery and Environmental Temperature Detection. 18
1.7.3 Remote EPO Input Port........................................................................................... 18
1.7.4 Generator Input Dry Contact................................................................................... 19
1.7.5 BCB Input Port.......................................................................................................... 20
1.7.6 Battery Warning Output Dry Contact Interface .................................................... 21
1.7.7 Integrated Warning Output Dry Contact Interface............................................... 21
1.7.8 Mains Failure Warning Output Dry Contact Interface......................................... 22
Chapter 2 Battery Installation and Maintenance.................................................................................. 23
2.1 General Recommendations............................................................................................... 23
2.2 Battery cabinet typologies.................................................................................................. 24
2.2.1 Modular Battery Cabinet.......................................................................................... 24
2.2.2 Traditional Battery Installation ................................................................................ 25
2.2.3 Modular Battery Pack Installation .......................................................................... 26
2.2.4 Battery setting........................................................................................................... 27
2.2.5 Advanced battery Functions (Software Settings Performed by the
Commissioning Engineer)................................................................................................. 28
2.3 Battery Maintenance........................................................................................................... 29
Chapter 3 Installation of UPS System and Parallel System.................................................................... 30
3.1 Overview............................................................................................................................... 30
3.2 UPS system in Parallel function ........................................................................................ 30
3.2.1 Features of Parallel System.................................................................................... 31

Contents
MUST400_User manual_EN_REV02 User Manual - 5 -
3.2.2 Parallel Requirements of UPS Modules................................................................ 31
3.2.3 Installation of Cabinet.............................................................................................. 31
3.2.4 External Protective Devices.................................................................................... 31
3.2.5 Power Cables............................................................................................................ 31
3.2.6 Parallel Signal Board ............................................................................................... 32
3.2.7 Control Cables.......................................................................................................... 32
3.2.8 Parallel functioning setting...................................................................................... 33
Chapter 4 Installation Drawing.............................................................................................................. 34
4.1 Internal Battery Module....................................................................................................... 40
4.1.1 Appearance of Internal Battery Module................................................................. 40
Chapter 5 Operations............................................................................................................................ 42
5.1 Introduction........................................................................................................................... 42
5.1.1 Split-Bypass Input..................................................................................................... 43
5.1.2 Static Transfer Switch.............................................................................................. 43
5.2 Operating Mode................................................................................................................... 43
5.2.1 Normal Mode............................................................................................................. 44
5.2.2 Battery Mode............................................................................................................. 44
5.2.3 Auto-Restart Mode ................................................................................................... 44
5.2.4 Bypass Mode ............................................................................................................ 44
5.2.5 Cold Start Mode........................................................................................................ 44
5.2.6 Maintenance Mode (Manual Bypass).................................................................... 44
5.2.7 Parallel Redundancy Mode (System Expansion)................................................ 44
5.2.8 Eco Mode................................................................................................................... 45
5.2.9 Soft start..................................................................................................................... 45
Chapter 6 Operating Instructions.......................................................................................................... 46
6.1 Introduction........................................................................................................................... 46
6.1.1 Power Switches........................................................................................................ 46
6.2 UPS Startup.......................................................................................................................... 46
6.2.1 Start-Up Procedure.................................................................................................. 47
6.2.2 Procedures for Switching Between Operation Modes........................................ 48
6.3 Procedure for Switching the UPS between Maintenance Bypass and Normal Mode
...................................................................................................................................................... 48
6.3.1 Procedure for Switching from Normal Mode to Maintenance Bypass Mode... 48
6.3.2 Procedure for Switching from Maintenance Mode to Normal Mode................. 49
6.4 Procedure for Completely Powering Down a UPS......................................................... 50
6.5 EPO Procedure.................................................................................................................... 50
6.6 Auto Start .............................................................................................................................. 50
6.7 UPS Reset Procedure......................................................................................................... 50
6.8 Operation Instruction for Power Module Maintenance................................................... 51
6.9 Language Selection............................................................................................................. 52
6.10 Changing the Current Date and Time............................................................................. 52
6.11 Control Password 1........................................................................................................... 52
Chapter 7 Operator Control and Display Panel ..................................................................................... 53
7.1 Introduction........................................................................................................................... 53
7.1.1 Mimic Current Path................................................................................................... 54
7.1.2 Audible Alarm (buzzer)............................................................................................. 54
7.1.3 Functional Keys........................................................................................................ 55
7.1.4 Battery Pack Indicator.............................................................................................. 55
7.2 LCD Display Type................................................................................................................ 55
7.3 Detailed Description of Menu Items.................................................................................. 57

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7.4 UPS Event Log..................................................................................................................... 59
Chapter 8 Optional Parts....................................................................................................................... 63
8.1 Replacing Dust Filters......................................................................................................... 63
Chapter 9 Product Specification............................................................................................................ 65
9.1 Applicable Standards .......................................................................................................... 65
9.2 Environmental Characteristics........................................................................................... 65
9.3 Mechanical Characteristics................................................................................................ 66
9.4 Electrical Characteristics (Input Rectifier)........................................................................ 66
9.5 Electrical Characteristics (Intermediate DC Link)........................................................... 67
9.6 Electrical Characteristics (Inverter Output)...................................................................... 68
9.7 Electrical Characteristics (Bypass Input).......................................................................... 69
9.8 Efficiency............................................................................................................................... 70
Appendix A. Split-Bypass Input Connection.......................................................................................... 71
Appendix B. UPSilon free SW ................................................................................................................ 73
Appendix C. MTR setting software........................................................................................................ 74

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MUST400_User manual_EN_REV02 User Manual 7
Chapter 1 Installation
1.1 Introduction
This chapter introduces the relevant requirements for positioning and cabling of the Modular UPS and related
equipment. Because each site has its requirements, it is not the aim of this chapter to provide step-by-step
installation instructions, but to act as a guide for the general procedures and practices that should be observed
by the installing engineer.
Warning: installation can only be done by authorized engineers
Do not apply electrical power to the UPS equipment before the commissioning engineer arrives at installation site.
The UPS should be installed by a qualified engineer in accordance with the information contained in this chapter.All the
equipment not referred to in this manual is shipped with details of its own mechanical and electrical installation
information.
Note: 3-Phase 4-Wire Input Power is required
The standard UPS system can be connected to TN, TTAC distribution system (IEC60364-3) of 3-phase 4-
wire, and a 3-wire to 4-wire conversion transformer is provided as an optional part.
WARNING: battery hazards
SPECIAL CARE SHOULD BE TAKEN WHEN WORKING WITH THE BATTERIES ASSOCIATED WITH
THIS EQUIPMENT.
After battery connection, the battery terminals voltage will exceed 400Vdc and is potentially lethal.
Follow the suggested actions here below:
Eye protection must be worn to prevent injury from accidental electrical arcs.
Remove rings, watches and all metal objects.
Only use tools with insulated handles.
Wear rubber gloves.
If a battery leaks electrolyte, or is otherwise physically damaged, it must be replaced, stored in a
container resistant to sulfuric acid and disposed of in accordance with local regulations.
If electrolyte comes into contact with the skin, the affected area should be washed immediately with
water.
1.2 Initial Checking
Before installing UPS, please check these items as below:
1. Visually examine if there is any damage inside and outside the UPS rack and battery equipment due to the
transportation. Report any such damage to the shipper immediately.
2. Verify the product label and confirm the correctness of the equipment. The equipment label is attached on
the back of front door. The UPS model, capacity and main parameters are marked on the label.
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1.3 Location
1.3.1 UPS Location
The UPS is intended for indoor installation and should be located in a cool, dry and clean environment with
adequate ventilation to keep the environmental parameters within the specified operating range (see Table.9-
2).
Improper use of UPS and in condition out of the operating range invalid the warranty.
Avoid to install the UPS in room which are exposed directly under sunlight or near sources of hot air.
The Modular series UPS uses forced convection cooling by internal fans. Cooling air enters the module
through ventilation grills located at the front part of the cabinet and exhausted through grills located in the rear
part of the cabinet. Please do not block the ventilation holes.
If necessary, an extractor fans system should be installed to aid cooling-air flow.
An air filter should be used when the UPS is to operate in a dirty environment and should be regularly cleaned
to maintain proper airflow.
The cooling capacity of air conditioner should be selected according to the power loss data of UPS specified
in Table.9-8: Normal mode (VFI SS 111 double-conversion UPS)
Note 1 : The UPS should be installed on a concrete surface or other surface that is not combustible.
Note 2 : Ensure that the capacity of the floor is greater than the weight of the UPS and battery cabinet (if
present), and verify that the floor is flat.
1.3.2 External Battery Room
The battery will generate some amount of hydrogen and oxygen at the end of charging, so the fresh air volume
of the battery installation environment must meet EN50272-2001 requirements.
The environmental temperature of the battery must be stable. Ambient temperature is a major factor in
determining the battery capacity and lifetime.
The rated operating temperature of battery is 20°C. Operating above this temperature will reduce the battery
life, and operation belowthis temperature will reduce thebattery capacity. If the average operating temperature
of battery is increased from 20ºC to 30ºC, then the service life of the battery will be reduced by 50%. If the
operating temperature of the battery is above 40ºC, then the battery service life will decrease in exponential
rate.
In a normal installation, the battery temperature is maintained between 15°C and 25°C. Keep batteries away
from heat sources or air outlets.
If external batteries are used, the battery circuit breakers (or fuses) must be mounted as close as possible to
the batteries, and the connecting cables should be as short as possible.
(*): The standard EN 50272-2 for air change envisages that the minimum opening must satisfy the following equation:
A = 28 x Q = 28 x 0.05 x n x Igas x C10 (1/10³) [cm²]
where: A = free opening for air intake and outlet
Q = flow of air to be removed [m³/h]
n = number of battery elements;
C10 = battery capacity over 10 hours [Ah]
Igas = current that produces gas [mA//Ah]
in accordance with the standard: Igas = 1 VRLA type battery
When the equation is applied for 240 element (40 battery) hermetically-sealed lead batteries:
A = 336 x C10 / 10³ [cm²]
When using 120Ah batteries, the minimum aperture should be approximately:
A = 41 [cm²]

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MUST400_User manual_EN_REV02 User Manual 9
1.3.3 Storage
If the equipment is not installed immediately, it must be stored in a room protected against excessive humidity
and heat sources (see Table.9-2).
The battery needs to be stored in dry and cool place with good ventilation.
The most suitable storage temperature is from 20 ºC to 25ºC.
Preventing battery slow discharge
Should the UPS remains unpowered for a prolonged period of time while the battery are connected, the
batteries may slowly discharge and being so permanently damaged .In such cases it is therefore
recommended to leave the battery circuit breaker(s) open. During storage in any case, periodically charge
the battery according to the battery user manuals.
1.4 Positioning
When the equipment has been positioned, ensure the UPS will remain stationary and stable.
To guarantee optimize working lifetime, the place chosen must guarantee:
Space for easy operation on the UPS
Enough air to dispel heat produced by UPS
Protection against atmospheric agents
Protection against excessive humidity and heat sources
Protection against dust
With the current fire prevention requirements
The operating environment temperature is within +20°C to +25°C. The batteries are at maximum
efficiency in this temperature range (for information about the battery storage and transportation as well
as the environment, refer to Table.9-2 )
This equipment is of steel frame structure wrapped by removable panels. The cover and the lateral
panels are fixed by screws.
After opening the UPS rack door, the auxiliary connections for communitation ports and dry-contact and
the maintenance bypass can be accessed.
The UPS provides air inlet port in the front and the air exhaust port in the rear part. It is forbidden to
install the UPS directly to the rear wall. Leave at least 50cm of free space in the rear. See picture
below.
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1.4.1 System Cabinet
A UPS system can comprise an UPS rack system, external battery cabinet, depending on the specific system
requirement.
All the UPS system cabinets used in the same installation site are of the same height and should be positioned
side-by-side to achieve an aesthetically appealing effect. Refer to Chapter 7 Installation Drawing for the
positioning of UPS cabinet.
1.4.2 Moving the Cabinets
Warning
Ensure that any lifting equipment used in moving the UPS cabinet have sufficient lifting capacity. The UPS
is fitted with castors –take care to prevent movement when unbolting the equipment from its shipping pallet.
Ensure adequate personnel and lifting aids are available when removing the shipping pallet.
Ensure that the UPS weight is within the weight loading capacity range of any hoisting equipment. See Table.9-
3 for UPS weight.
UPS and optional cabinets can be handled by means of a fork lift or similar equipment. The UPS cabinet can
also be moved by its wheels (where are present) only for short distance.
Note: Care must be taken when handling units fitted with batteries. Keep such moves to a minimum.
1.4.3 Distances Required for Operating
It’s no necessary to leave free space in lateral part of the UPS.
To permit first commissioning, the tightening of power terminals inside the UPS and all service activity, it is
recommended to leave enough free space to enable the passage of personnel with the doors fully opened. It
is important to leave a distance of 500mm in the rear side of the rack to permit adequate circulation of air
coming out the unit.
1.4.4 Front Access & Rear access
The UPS system is designed for front and rearaccess. For common service activity and replacement of power
modules is required only front access, for installation is required rear access.
1.4.5 Final Positioning
When the equipment has been finally positioned, ensure the adjustable feet are set so that the UPS will remain
stationary and stable.
1.4.6 Installation of Adjustable Feet
Installation diagrams in Chapter 4 of this manual identify the location of the holes in the base plate through which the
equipment can be bolted to the floor. If the UPS is to be located on a raised floor, it should be mounted on a pedestal suitably
designed to accept the UPS point loading (more than 800 kg).
1.4.7 UPS Composition
The UPS structure is shown in Fig. 1-1. The UPS configuration is available in Table. 1-1
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System Unit
Bypass
Moudle
Power
Module
Power
Connection
(a) 10 module cabinet
System Unit
Bypass
Moudle
Power
Module
Power
Connection
(b) 6 module cabinet

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12 MUST400_User manual_EN_REV02 User Manual
(c) 3 module cabinet including battery packs inside
Fig.1- 1: UPS Structure
Table.1- 1: UPS Configuration List
Item
Component
Quantity
Remarks
1
System Display
1
Requisite, factory installed
2
Bypass module
1
Requisite, factory installed
3
Input/output/maintenance
bypass breakers
1
Requisite, factory installed
4
Power module
1 ≤n ≤10
Requisite
5
Battery module
0~16
Optional. Only available for battery inside model
6
Battery breaker
1
Requisite. Only available for battery inside model
1.4.8 Installing Power Modules and Battery Modules
The number and positions of the Power Modules and Battery Modules may change according to the chosen
factory configuration.
It’s not possible to install a power module instead of a battery module and vice versa.
It is suggestable to install the power modules and Battery modules from bottom to top, in order to avoid cabinet
toppling due to higher gravity center.
The default power modules number is from the bottom to the top. So on bottom there is power module NO.1
up to the top where there is power module NO.10 (10 modules cabinet), or NO.6 (6 modules cabinet).
Insert the module in the right free shelf, and push it into the cabinet.
Secure the module to the cabinet through the fixing holes on both sides of the front panel of the module.
See fig.1-2

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MUST400_User manual_EN_REV02 User Manual 13
Fig.1- 2: Power Module Installation Diagram
1.4.9 Cable Entry
Cables can enter into the UPS system both from bottom and top. Cable entry is made possible through a
blanking plates fitted at the bottom or top of the equipment. The recommended installation practice is to install
glands to prevent foreign material entering into the cabinet.
1.5 External Protective Devices
For safety concerns, it is necessary to install external circuit breakers or other protective devices for the input
AC supply of the UPS system. This section provides generic practical information for qualified installation
engineers. The installation engineers should have the knowledge of the wiring standards, and the equipment
to be installed.
1.5.1 Rectifier and Bypass Input Supply of the UPS
Over currents
Install suitable protective devices in the distribution unit of the incoming mains supply, considering the power
cable current-carrying capacity and overload capacity of the system (see Tab. 9-7). Generally, the magnetic
circuit breaker with IEC60947-2 tripping curve C (normal) at the 125% of the current listed in Tab. 9-7 is
recommended.
Dual input: In case of split bypass used, separate protective devices should be installed for the rectifier input
and bypass input in the incoming mains distribution panel.
Note: The rectifier input and bypass input must use the same neutral line.
So don’t remove the neutral common copper bridge present between input and bypass terminals

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14 MUST400_User manual_EN_REV02 User Manual
Protection against earth faults (RCD devices):
The RCD device installed upstream of the input supply should be comply with:
Sensitive to DC unidirectional pulses (classA) in the network
Insensitive to transient current pulses
Have an average sensitivity that is adjustable between 0.3A and 1A.
Fig.1- 3: The Symbols of RCCB
When using the RCD in the split bypass system or parallel system, the RCD should be installed upstream of
the input distribution to avoid wrong alarm.
The residual current introduced by RFI filter in the UPS is between 3.5mAand 1000mA. It is recommended to
confirm the sensitivity of each RCD of upstream input distribution and downstream distribution (to load).
1.5.2 External Battery
The DC compatible circuit breaker provides over current protection for UPS system and battery, which is
provided by the external battery cabinet.
1.5.3 UPS Output
In case of an external distribution cabinet is used for load distribution, the selection of protective
devices must provide discrimination with those that are used at the input to the UPS
(see Tab. 9-7).

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MUST400_User manual_EN_REV02 User Manual 15
1.6 Power Cables
Design the cables according to the descriptions in this section and local regulatory wiring standards, and the
environmental conditions (temperature and physical support media) should be taken into consideration.
Refer to IEC60950-1 Table 3B Cabling.
WARNING
FAILURE TO FOLLOW ADEQUATE EARTHING PROCEDURES CAN RESULT IN EMI, ELECTRIC SHOCK HAZARD,
OR RISK OF FIRE, IFAN EARTH FAULT OCCURS.
Table.1- 2: Maximum Steady AC and DC Current
UPS
power(KVA)
Rated current (A)
Main input current at full load
battery charging (1，2)
Output current at full load
(2)
Battery discharging current at
E.O.D=1.67V/cell, no overload
380V
400V
415V
380V
400V
415V
36
Batt./string
38
Batt./string
40
Batt./string
200
306
291
280
303
288
277
468
443
421
120
184
175
168
182
173
166
281
266
253
100
153
146
140
152
144
139
234
222
211
60
92
88
84
91
87
83
142
133
127
40
62
59
56
61
68
56
94
89
85
30
46
44
42
46
44
42
71
67
64
20
31
29
28
31
34
28
47
45
43
Note:
1. Input current of common input configurations of rectifier and bypass
2. Take special care when determining the size of the output and bypass neutral cable, as the current
circulating on the neutral cable may be greater than nominal current in the case of non-linear loads, which is
usually 1.732 times of rated currents.
3. The earth cable connecting the UPS to the main ground system must follow the most direct route possible.
The earth conductor should be sized according to the fault rating, cable lengths, type of protection, etc.
According to AS/IEC60950-1, the cross section area of the conductor is 90mm2 (200kVA), the cross section
area of the conductor is 50mm2 (120KVA).
4. When sizing battery cables, a maximum volt drop of 4Vdc. is permissible at the current ratings given in
Table.1-2. The load equipment is connected to a distribution network of individually protected busbars fed by
the UPS output rather than connected directly to the UPS. Incase off cabinet parallel, the output cable of each
ups rack unit should be kept at equal length between the output of the ups rack output terminals and the
parallel distribution busbars to avoid affecting the shared current. When laying the power cables, do not form
coils, so as to avoid the formation of electromagnetic interference.
5. See Chapter 4 Installation Drawing for the positions of wiring terminals.
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1.6.1 Cable Connections
Note
The operations described in this section must be performed by authorized electricians or qualified
technical personnel. If you have any difficulties, do not hesitate tocontact our Customer Service & Support
department.
After the equipment has been finally positioned andsecured, refer to Chapter 4 Installation Drawing to connect
the power cables as described in the following procedures:
1. Verify that all the external input distribution switches of the UPS are completely opened and the UPS internal
maintenance bypass switch is opened. Attach necessary warning signs to these switches to prevent
unauthorized operation.
2. Open rear panel of the UPS, and then the power connection terminals are accessible.
3. Connect the protective earth and any necessary grounding cables to the PE terminal. The cabinet for the
UPS must be connected to the user’s ground connection.
Note: The grounding cable and neutral cable must be connected in accordance with local and national codes
practice.
Identify and make power connections for incoming cables according to one of the two procedures below,
depending on the type of installation:
Common Input Connections
4. For common bypass and rectifier inputs, connect the AC input supply cables to the UPS input terminals
(input A-B-C-N) Refer to Fig. 4-11 and tighten the connections to 5 Nm (M6 Bolt), 13Nm (M8 Bolt) or 25Nm
(M10 Bolt).
ENSURE CORRECT PHASE ROTATION AND TIGHTEN CONNECTION TERMINALS
Split Bypass Connections (option)
5. If a 'split-bypass' configuration is used, ensure that the common copper bridges between Bypass and
Rectifier inputs are removed.
Note: DO NOT REMOVE THE NEUTRAL COPPER BRIDGE
Connect the AC input supply cables to the rectifier input terminals (input A-B-C-N) Refer to Fig.4-11 and the
AC bypass supply cables to the bypass input terminals (bypass A-B-C-N) and tighten the connections to 5 Nm
(M6 Bolt) or 13Nm (M8 Bolt) or 25Nm (M10 Bolt).
Note: ENSURE CORRECT PHASE ROTATION AND TIGHTEN CONNECTION TERMINALS
Frequency Converter Mode
If the frequency converter configuration is used, connect the AC input cables to the rectifier input terminals
(input A-B-C-N) Refer to Fig.4-11 and tighten the connections to 5Nm (M6 bolt), or to 13Nm (M8 bolt), or to
25Nm (M10 bolt).
Note: ENSURE CORRECT PHASE ROTATION AND TIGHTEN CONNECTION TERMINALS.
No need to connect the bypass input cables to bypass input terminals in case of dual input version and ensure
to remove copper bridge in phases terminals. Leave the neutral copper bridge installed.
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MUST400_User manual_EN_REV02 User Manual 17
Output System Connections
6. Connect the system output cables between the UPS output terminals (output A-B-C-N) Refer to Fig.4-11
and the critical load and tighten the terminals screws to 5Nm (M6 Bolt) or to 13Nm (M8 Bolt) or to 25Nm (M10
Bolt).
Note: ENSURE CORRECT PHASE ROTATION.
WARNING
If the load equipment will not be ready to accept power on the arrival of the commissioning engineer, then
ensure that the system output cables are safely isolated at their ends.
7. Re-install all the protective covers.
1.7 Control Cabling and Communication
1.7.1 UPS Dry Contact and Monitoring Board Features
According to the specific needs of the application, the UPS may need auxiliary connection to realize the
management of the battery system (including external battery switch and battery temperature sensor),
communication with PC, provide alarm signal to external device, or realize remote EPO.
These functions are realized through the UPS dry contact board (GJ) and monitoring board (JK) on the front
of bypass module.
The UPS system provides the following interfaces:
EPO (Emergency power off)
Environment and battery temperature input interface
Generator input dry contact interface
Battery warning output dry contact interface
Battery circuit breaker interface
Main failure warning output dry contact interface
Slot (TM) for intelligent card interface
User RS232 and RS485 communication interface
Fig.1- 4: Bypass Module (Include Interface of Dry Contact Board GJ and Monitoring Board FK)
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1.7.2 Dry Contact Interface of Battery and Environmental Temperature Detection
The input dry contact J2 and J3 detect the temperature of batteries and environment respectively, which can
be used in environment monitoring and battery temperature compensation.
J2 and J3 interfaces diagram are shown in fig.1-5, the description of interface is in table.1-3.
J2 J3
TEMP_BAT
TEMP_ENV
Fig.1- 5: Diagram of J2 and J3 Dry Contact of Temperature Detection
Table.1- 3: Description of Input Dry Contact
Position
Name
Purpose
J2.1
TEMP_BAT
Battery temperature detection
J2.2
/
Battery temperature detection
J3.1
TEMP_ENV
Environment temperature detection
J3.2
/
Environment temperature detection
Note: Specified temperature sensor is required for temperature detection (R25=5Ohm, B25/50=3275),
please confirm with the manufacturer, or contact local maintenance engineers when placing an order.
1.7.3 Remote EPO Input Port
The UPS has the Emergency Power OFF (EPO) function. This function can be activated by pressing a button
on the control panel of the UPS or through a remote contact provided by the user. The EPO push button is
protected by a hinged plastic cover.
J4 is the input port for remote EPO. It requires shorting NC and +24v during normal operation, and the EPO
is triggered when opening NC and +24v, or shorting NO and +24v.
The port diagram is shown in fig.1-6, and port description is shown in table.1-4.
J4
EPO_NC
+24V
EPO_NO
+24V
Fig.1- 6: Diagram of Input Dry Contact for Remote EPO
Table.1- 4: Description of Input Dry Contact for Remote EPO

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MUST400_User manual_EN_REV02 User Manual 19
Position
Name
Purpose
J4.1
EPO_NC
EPO is activated when disconnecting fromJ4.2
J4.2
＋24V
+24V, connect the common terminal of NC and NO
J4.3
EPO_NO
EPO is activated when shorting with J4.2
The EPO is triggered when shorting pin 2 and 3 or opening pin 2 and 1 of J4.
If an external emergency stop facility is required, it is connected via the reserved terminals of J4. The external
emergency stop facility needs to use shielded cables to connect to the normally open/closed remote stop
switch between these two pins. If this facility is not used, then pin 3 and pin 4 of J4 must be open, or pin 1 and
pin 2 of J4 must be shorted.
1.7.4 Generator Input Dry Contact
J5 is the status interface for generator connection. Connect J5-2 with J5-1, it indicates that the generator has
been connected with the system. The interface diagram is shown in fig.1-7, and interface description is shown
in table.1-5.
J5
+24V
AUX_N.O.
AUX_N.O.
Gernerator
Fig.1- 7: Connection of Generator
Note
1. The emergency stop action within the UPS will shut down the rectifier, inverter and static bypass. However, it
does not internally disconnect the mains input power supply. To disconnect ALL power to the UPS, open the
upstream input circuit breaker(s) when the EPO is activated.
2. Pin 1 and 2 of J4 have been shorted before the UPS is delivered.
3. All auxiliary cables must be double insulated twisted cables with cross sectional area of 0.5mm2 ~
1.5mm2 for maximum connection length between 25m and 50m.
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Table.1- 5: Description of Status Interface and Connection of Generator
Position
Name
Purpose
J5.1
+24V
Internal +24V power supply
J5.2
GEN
Connection status of generator
J5.3
GND
Power ground
Note
All auxiliarycables must be double insulated twisted cables with crosssectional area of 0.5mm2
~ 1.5mm2 for maximum connection length between 25m and 50m.
1.7.5 BCB Input Port
J6 and J7 are the ports of BCB. The diagram is shown in fig.1-8, and description is shown in table.1-6.
BCB_DRV
BCB_CONT
J6 J7
BCB_ONL
+24V
+24V
+24V
Fig.1- 8: BCB Interface
Table.1- 6: Description of BCB Interface
Note: In case of BACKFEED protection option required, the system change the meaning of the contacts here above for
piloting backfeed protection device.
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Position
Name
Description
J6.1
BCB_DRV
BCB actuating signal, provide the actuating signal of +24V, 20mA
J6.2
BCB_CONT
BCB contact status, connect with the normally open signal of BCB
J7.1
GND
Common connection
J7.2
BCB_ONL
BCB on-line–input (normally open) , BCB is on-line when the signal
is connecting with common connection
Note
All auxiliarycables must be double insulated twisted cables with crosssectional area of 0.5mm2
~ 1.5mm2 for maximum connection length between 25m and 50m.
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