Vertiv NetSure 531 A91 User manual

NetSure 531 A41, NetSure 531 A91 Subrack Power System
User Manual
Version
V1.4
Revision date
December 31, 2017
BOM
31012809
Vertiv Tech provides customers with technical support. Users may contact the nearest Vertiv local sales
office or service center.
Copyright © 2017 by Vertiv Tech Co., Ltd.
All rights reserved. The contents in this document are subject to change without notice.
Vertiv Tech Co., Ltd.
Address: Block B2, Nanshan I Park, No.1001 Xueyuan Road, Nanshan District, Shenzhen, 518055,
P.R.China
Homepage: www.vertivco.com
E-mail: [e-mail]

Safety Precautions
To reduce the chance of accident, please read the safety precautions very carefully before operation. The
"Caution, Notice, Warning, Danger" in this book do not represent all the safety points to be observed, and are
only supplement to various safety points. Therefore, the installation and operation personnel must be strictly
trained and master the correct operations and all the safety points before actual operation.
When operating Vertiv products, the safety rules in the industry, the general safety points and special safety
instructions specified in this book must be strictly observed.
Electrical Safety
I. Hazardous voltage
Danger
Some components of the power system carry hazardous voltage in operation. Direct contact or indirect contact through
moist objects with these components will result in fatal injury.
Safety rules in the industry must be observed when installing the power system. The installation personnel must
be licensed to operate high voltage and AC power.
In operation, the installation personnel are not allowed to wear conductive objects such as watches, bracelets,
bangles, rings.
When water or moisture is found on the Subrack, turn off the power immediately. In moist environment,
precautions must be taken to keep moisture out of the power system.
"Prohibit" warning label must be attached to the switches and buttons that are not permitted to operate during
installation.
Danger
High voltage operation may cause fire and electric shock. The connection and wiring of AC cables must be in compliance
with the local rules and regulations. Only those who are licensed to operate high voltage and AC power can perform high
voltage operations.
II. Tools
Warning
In high voltage and AC operation, special tools must be used. No common or self-carried tools should be used.
III. Thunderstorm
Danger
Never operate on high voltage,AC, iron tower or mast in the thunderstorm.
In thunderstorms, a strong electromagnetic field will be generated in the air. Therefore the equipment should be
well earthed in time to avoid damage by lightning strikes.

IV. ESD
Notice
The static electricity generated by the human body will damage the static sensitive elements on PCBs, such as large-scale
ICs. Before touching any plug-in board, PCB or IC chip, ESD wrist strap must be worn to prevent body static from
damaging the sensitive components. The other end of the ESD wrist strap must be well earthed.
V. Short circuit
Danger
During operation, never short the positive and negative poles of the DC distribution unit of the system or the non-grounding
pole and the earth. The power system is a constant voltage DC power equipment, short circuit will result in equipment
burning and endanger human safety.
Check carefully the polarity of the cable and connection terminal when performing DC live operations.
As the operation space in the DC distribution unit is very tight, please carefully select the operation space.
Never wear a watch, bracelet, bangle, ring, or other conductive objects during operation.
Insulated tools must be used.
In live operation, keep the arm muscle tense, so that when tool connection is loosened, the free movement of
the human body and tool is reduced to a minimum.
VI. Dangerous energy
Warning
More than 240VAsystem capacity, keep away from hazardous energy and avoid bridge connection.
Battery
Danger
Before any operation on battery, read carefully the safety precautions for battery transportation and the correct battery
connection method.
Non-standard operation on the battery will cause danger. In operation, precautions should be taken to prevent
battery short circuit and overflow of electrolyte. The overflow of electrolyte will erode the metal objects and PCBs,
thus causing equipment damage and short circuit of PCBs.
Before any operation on battery, pay attention to the following points:
Remove the watch, bracelet, bangle, ring, and other metal objects on the wrist.
Use special insulated tools.
Use eye protection device, and take preventive measures.
Wear rubber gloves and apron to guard against electrolyte overflow.
In battery transportation, the electrode of the battery should always be kept facing upward. Never put the battery
upside down or slanted.

BLVD
The system has battery low voltage disconnection (BLVD) function. BLVD means when the mains fail and
batteries supply power, the controller cuts the load off when the battery voltage drops down to below 43.2V to
prevent over-discharge. The BLVD voltage is settable. Refer to ACU+ or NCU User Manual for setting method.
The factory setting is enabling BLVD, which means that if power outage lasts for a long time or the power system
fails, there might be BLVD. Users should classify the loads and connect the priority loads to BLVD routes. For
vital loads, users can disable BLVD of these loads to insure reliability of the power supply.
The method of disabling BLVD is:
Set “BLVD Enable”item of the controller to “N”. Refer to ACU+ or NCU User Manual for setting method.
Notice
The advantage of enabling BLVD is protecting the batteries from over-discharge when the battery voltage is low. The
disadvantage of enabling BLVD is that when the battery voltage drops down to a certain value, all the loads (including
non-priority loads and priority loads) will be cut off due to battery disconnection.
The advantage of software disabling BLVD is prolonging the power supply of priority loads. The disadvantage is that
software disabling cannot prevent unwanted power failure due to misoperation or power system failure.
Others
I. Sharp object
Warning
When moving equipment by hand, protective gloves should be worn to avoid injury by sharp object.
II. Cable connection
Notice
Please verify the compliance of the cable and cable label with the actual installation prior to cable connection.
III. Binding the signal lines
Notice
The signal lines should be bound separately from heavy current and high voltage lines, with binding interval of at least
150mm.

Contents
Chapter 1 Overview ............................................................................................................................................................1
1.1 Composition And Configuration ............................................................................................................................1
1.2 Features................................................................................................................................................................2
Chapter 2 Installation Instruction.........................................................................................................................................3
2.1 Safety Regulations................................................................................................................................................3
2.2 Preparation...........................................................................................................................................................3
2.3 Mechanical Installation..........................................................................................................................................4
2.4 Electrical Installation.............................................................................................................................................6
2.4.1 Power System Cabling Method .................................................................................................................6
2.4.2 Connecting AC Input Cables .....................................................................................................................8
2.4.3 Connecting Load Cables ...........................................................................................................................9
2.4.4 Connecting Battery Cables........................................................................................................................9
2.4.5 Connecting Signal Cables .......................................................................................................................10
Chapter 3 Commissioning.................................................................................................................................................14
3.1 Installation Check And Startup............................................................................................................................14
3.2 Basic Settings.....................................................................................................................................................15
3.3 Alarm Check And System Operation Status Check............................................................................................16
3.4 Final Steps..........................................................................................................................................................16
Chapter 4 Trouble Shooting..............................................................................................................................................17
4.1 Alarms Handling..................................................................................................................................................17
4.2 Rectifier Fault Handling.......................................................................................................................................18
Appendix 1 Technical And Engineering Data....................................................................................................................20
Appendix 2 Installation Instruction Of Battery Rack ..........................................................................................................23
1. Installation Instruction Of Two-Layer And Four-Layer Battery Rack.....................................................................23
2. Installation Instruction Of Three-Layer Battery Rack.............................................................................................25
3. Fixing The Battery Rack........................................................................................................................................26
Appendix 3 Wiring Diagram...............................................................................................................................................27
Appendix 4 Schematic Diagram........................................................................................................................................31
Appendix 5 Glossary.........................................................................................................................................................34

Chapter 1 Overview 1
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
Chapter 1 Overview
This chapter introduces composition, configuration, and features.
The “power system” in this manual refers to the NetSure 531A41 and NetSure 531A91 series 19 inch subrack power
system.
1.1 Composition And Configuration
System composition
The system consists of power distribution parts, rectifiers and controller. The internal structures of the systems are
shown in Figure 1-1 to Figure 1-3.
AC output (N)
AC input terminal
Earthing screw
AC output (L)
Battery MCB
Positive terminal
Load MCB
Controller Rectifier
Figure 1-1 NetSure 531 A41-S1/S2 system structure
AC input terminal
Earthing screw
Battery MCB
Positive terminal
Load MCB
Rectifier
Controller
Figure 1-2 NetSure 531 A41-S3 system structure
Positive terminal
Battery MCB
Controller Rectifier
AC input
terminal
Load MCB
Load MCB
Figure 1-3 NetSure 531 A91-S1 system structure

2 Chapter 1 Overview
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
System configuration
The configurations of the power system are described in Table 1-1.
Table 1-1 Configuration of fixed- configuration system
Item
NetSure 531 A41-S1/S2
NetSure 531 A41-S3
NetSure 531 A91-S1
Contorller
Model：M221S/M222S
Model：M820B/M830B
ModelM221S/M222S
Rectifier
Model: R48-2000e3
Max. configuration: 4 pieces
Model: R48-2000e3
Max. configuration: 4 pieces
Model: R48-2000e3
Max. configuration: 9 pieces
AC power distribution
L＋N＋PE/ 220Vac
L＋N＋PE/220Vac
3P＋N＋PE/380Vac
DC power distribution
BLVD load route: (PL)
1 ×16A/1P; 1 ×16A/1P; MCB
LLVD load route：
1 ×63A/1P; 1 ×63A/1P,
2 ×32A/1P MCB
BLVD load route: (PL)
2 ×10A/1P; 2 ×32A/1P MCB
LLVD load route：
2 ×63A/1P; 2 ×32A/1P MCB
BLVD load route: (PL)
5 ×63A/1P; 5 ×32A/1P;
8 ×10A/1P MCB
LLVD load route： Not configured
AC output MCB
1 ×16A/1P
Optional
Optional
Battery MCB
2 ×63A/1P
2 ×63A/1P
2 ×125A/1P
AC SPD
1 piece
Optional
Optional
DC SPD
1 piece
Optional
Optional
Top cover
Optional
Optional
Optional
BLVD contorller mode
Controller automatic power-off
Controller automatic power-off
Controller automatic power-off
Notes:
1. Optional configuration: Temperature sensor and its cables, battery rack and battery cables
2. Controller automatic power-off: If a battery low voltage disconnection (BLVD) occurs, the controller will fully disconnect from the
battery. At this moment, the controller is power-off, communication is failure, and the dry contact alarm is invalid. This control mode
can effectively protect the battery against overdischarge due to BLVD.
3. Weight: Packaging included, rectifier and controller excluded
1.2 Features
The rectifier uses the active Power Factor Compensation (PFC) technology, raising the power factor to 0.99.
Wide AC input voltage range: 85Vac ~ 300Vac.
The rectifier uses soft switching technology, efficiency up to 96%.
Ultra-low radiation. With advanced EMC design, the rectifier meets international standards such as CE, NEBS
and YD/T983 standards. Both the conducted and radiated interference in an optimal state can reach Class B.
The design of rectifier safety complies with UL, CE and NEBS standards.
High power density.
Rectifiers are hot pluggable. It takes less than 1min to replace a rectifier.
Two over-voltage protection methods are optional: hardware protection and software protection. The latter one
also has two optional modes: lock-out at the first over-voltage and lock-out at the second over-voltage.
Improved battery management: The management functions include the LLVD (optional), BLVD, temperature
compensation, auto voltage regulation, stepless current limiting, battery capacity calculation and on-line battery
test, etc.
M221S and M222S support historical alarm record up to 200 pcs and historical record up to 1000 pcs. And
M820B/M830B supports historical alarm record up to 3000 pcs and historical record up to 60000 pcs.
10 sets of battery test data records.
Network design: Providing multiple communication ports (such as RS232, Modem, Ethernet and dry contacts),
which enables flexible networking and remote monitoring. M820B/M830B support the USB communication
interface.
Improved lightning protection at AC side and DC side.
Complete fault protection and fault alarm functions.
NetSure 531 A41-S1 and NetSure 531 A41-S2 adopt the control mode of “Controller automatic power-off”, This
way effectively prevents the storage battery from deeply discharging after system battery protection drops out
and hence prevents the unattended outdoors and indoors server rooms from the damage due to the deep
discharge.

Chapter 2 Installation Instruction 3
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
Chapter 2 Installation Instruction
2.1 Safety Regulations
Certain components in this power system have hazardous voltage and current. Always follow the instructions below:
1. Only the adequately trained personnel with satisfactory knowledge of the power system can carry out the
installation. The most recent revision of these safety rules and local safety rules in force shall be adhered to during
the installation.
2. All external circuits that are below 48V and connected to the power system must comply with the requirements of
SELV as defined in IEC 60950.
3. Make sure that the power (mains and battery) to the system is cut off before any operations can be carried out
within the system subrack.
4. The power subrack shall be kept locked and placed in a locked room. The key keeper should be the one
responsible for the power system.
5. The wiring of the power distribution cables should be arranged carefully so that the cables are kept away from the
maintenance personnel.
2.2 Preparation
Unpacking inspection
The equipment should be unpacked and inspected after it arrives at the installation site. The inspection shall be done
by representatives of both the user and Vertiv Tech Co., Ltd.To inspect the equipment, you should open the packing
case, take out the packing list and check against the packing list that the equipment is correct and complete. Make
sure that the equipment is delivered intact.
Cables
The cable design should meet relevant industry standards.
It is recommended to use the RVVZ cables as AC cables. The cable should reach at least +70°C temperature
durability. With cable length shorter than 30 meters, the Cross-Sectional Area (CSA) calculation should be based on
the current density of 3.5A/mm2. The suggested CSAvalue is no less than the Table 2-1.
Table 2-1 Load cable CSA selection
AC MCB rated current
Max. battery current
Min. cable CSA
Max. cable length
125A
105A
35mm2
50mm2
100A
80A
25mm2
50mm2
63A
58A
16mm2
25mm2
The CSA of DC cable depends on the current flowing through the cable and the allowable voltage drop. To select the
battery cable CSA, see Table 2-2. Select the DC load cable CSA according to the Table 2-3.
Table 2-2 Battery cable CSA selection
Battery MCB rated current
Max. battery current
Min. cable CSA
Max. cable length (volt drop: 0.5V, with max. CSA)
125A
105A
35mm2
6 m
63A
50A
16 mm2
5 m
Note:
1. The specs are applicable at ambient temperature of 25°C. If the temperature is higher than this, the CSA of the cable should
be increased.
2. The battery cable should reach at least +90°C heat durability. It is recommended to use double-insulated copper-core flame
retardant cable as battery cable

4 Chapter 2 Installation Instruction
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
Table 2-3 DC load cable selection
Load route rated
current
Max. output
current
Min. cable
CSA
Max. cable length (volt drop:
0.5V, with min. CSA)
Max. cable CSA
Max. cable length (volt drop:
0.5V, with max. CSA)
100A
80A
25mm2
14m
50mm2
20m
63A
50A
16mm2
9m
25mm2
14m
32A
25A
10mm2
11m
25mm2
29m
16A
12A
6mm2
14m
25mm2
48m
10A
8A
6mm2
23m
25mm2
98m
Note: The specs are applicable at ambient temperature of 25°C. If the temperature is higher than this, the CSA of the cable should
be increased
To prevent the air switching capacity is too large, the load overload does not work. Recommended the capacity of the
air switching is up to 1.5 ~ 2 times of the load peak.
The CSA of the system grounding cables should be consistent with the largest power distribution cables. The CSA
value is no less than 25mm2.
AC and DC power distribution interface definition see Table 2-4.
Table 2-4 AC and DC power distribution interface definition
Connector name
Connector specifications
Wiring instructions
AC power
distribution
AC input
MCB
H type terminal, max. cable CSA 50mm2(63A < MCB rated current
≤125A)
H type terminal, max. cable CSA 25mm2(MCB rated current ≤63A)
AC power line
Grounding
busbar
One M8 bolt, OT type wiring terminal, max. cable CSA 35mm2
Connected to the
grounding bar of the
building
DC power
distribution
Battery
output MCB
H type terminal, max. cable CSA 25mm2(MCB rated current ≤63A)
H type terminal, max. cable CSA 50mm2(63A < MCB rated current
≤125A)
Connected to the battery
port
Negative
output MCB
H type terminal, max. cable CSA 25mm2(MCB rated current ≤63A)
H type terminal, max. cable CSA 50mm2(63A < MCB rated current
≤125A)
Connected to the users
load port
Positive
busbar
Terminal subrack terminal：cable CSA ≤50mm2
Connected to the users
load port
2.3 Mechanical Installation
Note
1. The cabinet or rack the subrack power system installed in must provide fireproof and electric protection casing, or install in
cement or other difficult to burn, at the same time and other combustible materials to keep enough distance.
2. For the convenience of maintenance, users should maintain a clearance of 800mm at the front of the power system.
3. Subrack cannot be installed against the wall, it must leave enough space for heat dissipation.

Chapter 2 Installation Instruction 5
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
Installed on battery rack
1. Fix the subrack power system to the battery rack through the connectors with M6 bolts, as shown in Figure 2-1.
Connector
M6 screw
Subrack
power system
Connector
M6 screw
Battery bracket
Battery rack
Power system
Figure 2-1 Cabinet and rack installation
Installed in cabient
Insert the subrack power system to the matching cabinet, as shown in Figure 2-2.
电源插框
Power subrack
Figure 2-2 Installed in the cabinet system

6 Chapter 2 Installation Instruction
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
The engineering graphics of the subrack power system as shown in Figure 2-3 to Figure 2-4.
438.5+
-0.01
482.6+
-0.01
179.4+
-0.01
101.6+
-0.01 40.05+
-0.01
37.75+0.01
-
Figure 2-3 Installation size of NetSure 531 A41-S1/S2/S3 (unit: mm)
353.4+
-0.01
438.5+
-0.01
482.6+
-0.01
36.5+0.01
-
102.1+0.01
-
75.7+0.01
-
101.6+0.01
-
37.5+0.01
-
Figure 2-4 Installation size of NetSure 501 A91 (unit: mm)
Note
1. Tighten the captive screw of the MFU and DU Panel by the cross head screwdriver when there is no operation.
2. Also tighten the handle of the 501 modules by the cross head screwdriver.
3. Please plug in the new modules or installing a new panel after removing the rectifier module.
2.4 Electrical Installation
2.4.1 Power System Cabling Method
Cabling from the top of the power system
Epoxy board top cover and rubber ring top cover are optional for this system.

Chapter 2 Installation Instruction 7
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
Note:
If the user requires the system to meet the CE certification, install the epoxy board top cover to be installed at a distance of 1.8
meters high above the ground.
Epoxy board top cover for DU unit cabling:
Cabling from the cable outlet area and then fixed to the cable-bundling plate and the top edge. As shown in the
Figure 2-5.
Cable outlet area
Cable-bundling plate
Cable outlet area
Square unit
Figure 2-5 Cable entry Illustration of the DU unit
Epoxy board top cover for MFU unit cabling is shown in 2-6.
Cable outlet area
Cable-bundling plate
Signal cable
outlet holes
Cable outlet area
Square unit
Figure 2-6 Cable entry Illustration of the MFU unit
Dismantle several square units of the cable outlet area on site according to the actual cable outlet space.
Rubber ring top cover for DU unit cabling:
Use the electrician's knife incise the "+" mark on the rubber unit. As shown in Figure 2-7.
Latex unit
Cable outlet area
Figure 2-7 Cable entry Illustration of the DU unit

8 Chapter 2 Installation Instruction
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
Rubber ring top cover for MFU unit cabling is shown in Figure 2-8.
Cable outlet area
Latex unit
Figure 2-8 Cable entry Illustration of the MFU unit
Dismantle several square units of the cable outlet area on site according to the actual cable outlet space.
Cabling from side of the power system
Use a cross head screwdriver to remove two screws which fix the cabling panel at side of cabling area, then the cable
can be led out from the cabling area, as shown in Figure 2-9.
Screw
Cable-bundling plate
(cabling area)
Figure 2-9 Side cable cabling Illustration
2.4.2 Connecting AC Input Cables
Danger
Danger
1. Switch off all MCBs before the electrical connection.
2. Only the qualified personnel can do the mains cable connection.
Take the NetSure 531 A41 power system as an example, the positions of the terminals are shown in Figure 2-10.
Earthing screw
AC output terminal N AC output terminal L
AC input terminal N
AC input terminal L
Figure 2-10 Illustration of the connection terminal

Chapter 2 Installation Instruction 9
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
Note
1. If the AC input of the subrack is selected as terminal by user, there is no overcurrent and short circuit protection, and you
should configure the overcurrent and short circuit protection in the previous level of the subrack. Please contact Vertiv Tech Ltd
of local technical support for the device options.
2. Recommends that tightening torque of the users grounding screw is 10.78N*M.
3. If AC input of the system configured with SPD is single-phase, unplug the alarm terminal of the SPD before connecting the
ground wire. Then connect the ground wire, and finally reinstall the alarm terminal of the SPD.
2.4.3 Connecting Load Cables
Connect the negative cable of the load to the upper terminal of load MCB. Connect the positive cable of the load to
the DC positive busbar, as shown in Figure 2-11.
Priority load
Positive terminal
Load MCB
Non-priority load
Figure 2-11 Illustration of the load cable connection terminal
2.4.4 Connecting Battery Cables
Note
The batteries may have dangerous current. When connecting the battery cables, observe the following rules:
1. Make sure all the battery MCBs are disconnected.
2. Make sure that the battery cables and the battery string are disconnected. You can also disconnect the battery cell connector to
avoid live state or short circuit to the chassis of the power system after installation.
3. Be careful not to reverse connect the battery. Otherwise, both the battery and the power system will be damaged!
4. Never remove the battery cables at the top of the battery MCB when the battery input port of the power system is in live state.
1. Connect one end of the negative battery cable to the upper terminal of battery MCBs. Connect one end of the
positive battery cable to the DC positive bus bar.
2. Connect copper lugs to the other end of the battery cables. Bind the connecting parts with insulating tape, and put
them beside the battery. Connect the cables to the battery when the DC distribution unit is to be tested.As shown in
Figure 2-12.
Positive terminal
Battery MCB
Figure 2-12 Illustration of the battery connection terminal

10 Chapter 2 Installation Instruction
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
2.4.5 Connecting Signal Cables
There are two user interface board of the power system can optional, respectively the W2453X1 user interface board
and IB2 user interface board. The W2453X1 user interface board is used together with the M221S monitoring unit or
M222S monitoring unit only; and the IB2 user interface board is used together with the M820B/M830B monitoring unit
only.
W2453X1 user interface board cable connection
Take the NetSure 531 A41-S1 power system as an example, the position of the user connector board (W2453X1) is
shown in Figure 2-13.
信号电缆
用户接口板
用户接口板
（柔性配置）
Signal cable
User interface board
User interface board
(Flexible configuration)
Figure 2-13 W2453X1 user interface board Illustration
At most two user connector boards are allowed in the power system. Standard cabinet is only configured with one
user connector board.
With one user connector board configured, the power system provides three external digital signal input interfaces:
DI2, DI3, DI4 (DI1 is used for DC SPD alarm. If no DC SPD is configured in the power system, DI1 is available) and
four dry contact alarm output interfaces: DO1, DO2, DO3, DO4. With two user connector boards configured, the
power system provides additional four dry contact alarm output interfaces: DO5, DO6, DO7, and DO8.
Active dry contact need to be connected to the digital input port of the W2453X1 user interface board. The
specifications of the dry contact interface are as follows:
Digital inputs: opto-isolation, the alarm and power frequency is definable (high power level: 20V ~ 60V, low power
level: less than 1V).
Digital output: relay isolation, Max.:30Vdc/1A, 125Vac/0.5A, 60W; Min.: 10uA@10Vdc, alarm is definable.
The functions of the interfaces are shown in Table 2-5.
Table 2-5 Nterface functions
Type
Default alarm
Description
Dry contact 1
AC power failure
/
Dry contact 2
DC overvoltage or DC undervoltage
Four-level DC voltage alarms
Dry contact 3
Rectifier alarm
Except rectifier lost and multi-rectifier alarm
Dry contact 4
Priority LLVD
/
Dry contact 5
Non-priority LLVD
Exist when the second user interface board is installed
Dry contact 6
/
Exist when the second user interface board is installed
Dry contact 7
/
Exist when the second user interface board is installed
Dry contact 8
/
Exist when the second user interface board is installed
With default settings, when the preceding alarms are generated, the contactors of the corresponding dry contacts
should change their status, that is, the normally-open contactors close, and the normally-closed contactors open.All
the status changes should be verified by a multimeter. After the alarms are removed, the dry contacts should resume.

Chapter 2 Installation Instruction 11
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
The default settings of the dry contact alarms can be changed through the controller. The interfaces of the user
connector board are shown in Figure 2-14.
Figure 2-14 W2453X1 user connector board interface
IB2 user interface board
The external input and output signals are all connected to the IB2 user interface board. For the ports on the IB2 user
interface board, see Figure 2-15.
J9 J8 J7 J6 J5 J4
J12
J11
J2
Digital inputs 1~ 8,
20V ~ 60V
I C port
2
SW1
Address DIP
J3
Alarm output dry contact
.
Figure 2-15 IB2 extension board port definition
Note
1. J11 and J12 are temperature sensor ports. They are not used here.
2. J2 is I2C interface, and provides the power.

12 Chapter 2 Installation Instruction
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
See Table 2-6 for the dry contact terminal definition.
Table 2-6 Dry contact terminal definition
Name of double-layer port
Pin No.
Pin name
Definition
J3
1
DI1-
Digital input 1-
2
DI1+
Digital input 1+
3
DI2-
Digital input 2-
4
DI2+
Digital input 2+
5
DI3-
Digital input 3-
6
DI3+
Digital input 3+
J4
1
DI4-
Digital input 4-
2
DI4+
Digital input 4+
3
DI5-
Digital input 5-
4
DI5+
Digital input 5+
5
DI6-
Digital input 6-
6
DI6+
Digital input 6+
J5
1
DI7-
Digital input 7-
2
DI7+
Digital input 7+
3
DI8-
Digital input 8-
4
DI8+
Digital input 8+
5
NA
/
6
NA
/
J6
1
DO1_NC
NC contact of relay 1
2
DO2_NC
NC contact of relay 2
3
DO1_COM
Common contact of relay 1
4
DO2_COM
Common contact of relay 2
5
DO1_NO
NO contact of relay 1
6
DO2_NO
NO contact of relay 2
J7
1
DO3_NC
NC contact of relay 3
2
DO4_NC
NC contact of relay 4
3
DO3_COM
Common contact of relay 3
4
DO4_COM
Common contact of relay 4
5
DO3_NO
NO contact of relay 3
6
DO4_NO
NO contact of relay 4
J8
1
DO5_NC
NC contact of relay 5
2
DO6_NC
NC contact of relay 6
3
DO5_COM
Common contact of relay 5
4
DO6_COM
Common contact of relay 6
5
DO5_NO
NO contact of relay 5
6
DO6_NO
NO contact of relay 6
J9
1
DO7_NC
NC contact of relay 7
2
DO8_NC
NC contact of relay 8
3
DO7_COM
Common contact of relay 7
4
DO8_COM
Common contact of relay 8
5
DO7_NO
NO contact of relay 7
6
DO8_NO
NO contact of relay 8
The definition of dry contact function can be set through controller.
The specifications of the dry contact ports are as follows:
Digital inputs: 8-route, opto-isolation, the alarm and high/low level are definable (high level: 20V ~ 60V, low level: less
than 1V).
Digital output: 8-route, relay isolation, maximum: 30Vdc 1A, 125Vac 0.5A; 60W; minimum: 10uA @ 10Vdc, alarm is
definable.

Chapter 2 Installation Instruction 13
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
Connecting Communication Signal Cable
The communication port of the M221S controller is shown in Figure 2-16. The M222S only provides the RS232
communication serial port, whereas the Ethernet port is not provided.
RS232 communication
serial port
Ethernet port
Figure 2-16 M221S controller communication port
The communication port of the M820B controller is shown in Figure 2-17.
Ethernet port
USB port
Figure 2-17 M820B controller communication port
The communication port of the M830B controller is shown in Figure 2-18.
USB port
Ethernet port
Figure 2-18 M830B controller communication port

14 Chapter 3 Commissioning
NetSure 531 A41, NetSure 531 A91 Subrack Power system User Manual
Chapter 3 Commissioning
The more details of the controller please refer to the ACU+ User Manual, the NCU User Manual and the LCU+ User
Manual. This chapter introduces procedures of installation testing. The corresponding safety rules shall be adhered to
in the test.
3.1 Installation Check And Startup
Before the test, inform the chief manufacturer representative. Only trained electrical engineer can maintain and
operate this equipment. In operation, the installation personnel are not allowed to wear conductive objects such as
watches, bracelets, bangles and rings.
During operation, parts of this equipment carry hazardous voltage. Misoperation may result in severe or fatal injuries
and property damage. Before the test, check the equipment to ensure the proper earthing. Installation check must be
done before testing. Then the batteries can be charged for the first time.
Make sure that the AC input MCBs, battery MCBs and load MCBs are switched off. Make sure that all the devices are
properly installed.
Installation check
OK
Comments
Check all the MCBs and cables. Are their models correct?

Check the bus bar connections, input and output cable connection, and connection between the power
system and the system grounding.

Check the if the number and connections of the batteris are correct. Check the polarity of the battery string
with a voltmeter.

Make sure all the cable connections are firm and reliable.

Startup preparations
OK
Comments
Make sure that all the MCB are switched off.

Measure the AC input voltage. Make sure the input voltage is within the allowable range.

Umin=___V
Check that the communication and alarm cables are connected to the signal transfer board.

Check that the temperature sensor, if any, has been installed.

Check that the battery string circuit is not closed.

Connect the disconnected batteries to the battery string circuit

Switch off unconnected battery MCBs. Check that the battery signal cables are connected to battery
MCBs reliably, not loosened or suspended

Measure with a voltmeter across the connection points of each battery and make sure that the polarity is
right. For a lead-acid battery with 24 cells, the voltmeter should read 2.0-2.1V/cell or 48-51V/battery. If the
voltage of certain cell is lower than 2.0V, that cell must be replaced.

Umin=___V
Check with an ohmmeter that there is no short circuit between the positive & negative distribution bus
bars, or between the positive & negative battery poles
(Note: Pull out all modules before the check and restore them after the check)

Startup
OK
Comments
Switch on the system AC input MCB. The green LED on the rectifier will be on and the fan will start
running after a certain delay. The controller will show that the power supply voltage is 53.5V.

Check the system voltage and busbar polarity with a voltmeter. The voltage difference between the
measured value and displayed value should be less than ±0.2V.

Start and stop each rectifier of the system by unplugging and inserting each rectifier. Check their output
voltages.
