extronics iUPS101 User manual

Installation & Operating Manual
iUPS101

Operating Manual
2
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Document Number 331435 (See Last Page for Revision Details)
©2013 Extronics Limited. This document is Copyright Extronics limited.
Extronics reserve the right to change this manual and its contents without notice, the latest
version applies.

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Contents
1 Introduction.......................................................................................................... 6
2 Safety Information and Notes.............................................................................. 7
2.1 Storage of this Manual................................................................................... 7
2.2 Special Conditions for Safe Use.................................................................... 7
2.3 List of Notes .................................................................................................. 7
3 Installation and Set-to-work................................................................................. 9
3.1 Installation..................................................................................................... 9
3.2 Fitting the Cables......................................................................................... 10
3.2.1 Grid-connected emergency systems..................................................... 10
3.2.2 Distributed Minigrid............................................................................... 10
3.2.3 Earthing system.................................................................................... 10
3.2.4 Mobile installation or installation connected to the grid via plug connector
11
3.2.5 Fixed Installation................................................................................... 11
3.2.6 Installation with automatic PE-neutral switching ................................... 12
3.2.7 Connecting the cables .......................................................................... 12
3.2.8 24V Cable Termination:........................................................................ 13
3.2.9 48V Cable Termination:........................................................................ 13
3.2.10 Parallel AC Output Termination:........................................................ 14
3.2.11 Auxiliary Output & CANBUS:............................................................. 14
3.2.12 Emergency Shutdown Signal............................................................. 15
3.2.13 CAN bus connections........................................................................ 15
3.2.14 Connecting the AC supply sources.................................................... 15
3.2.15 Connecting the AC output.................................................................. 16
3.2.16 Connecting the battery....................................................................... 16
3.2.17 Wiring auxiliary contacts.................................................................... 17
3.3 Setting to work............................................................................................. 17
3.4 Fusing.......................................................................................................... 18
3.4.1 Fuse Values.......................................................................................... 18
4 Description and Functioning.............................................................................. 19
4.1 Circuit Diagram............................................................................................ 19
4.2 Description of the main functions................................................................. 19
4.2.1 Overview............................................................................................... 19
4.2.2 Inverter.................................................................................................. 19
4.2.3 Battery protection circuit ....................................................................... 19
4.2.4 Automatic load detection....................................................................... 20
4.2.5 Transfer relay........................................................................................ 20
4.2.6 Fast voltage loss detection mode (fast transfer): .................................. 20
4.2.7 Battery charger ..................................................................................... 21
4.2.8 The inverter as source backup (“smart boost” function)........................ 21
4.2.9 Battery protection.................................................................................. 21
4.2.10 iUPS101 protection............................................................................ 22
4.2.11 Auxiliary contacts............................................................................... 22
4.2.12 Remote Emergency Disconnect........................................................ 23
5 Operation........................................................................................................... 25
5.1.1 Powering up the installation.................................................................. 25

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5.1.2 Activating and deactivating the iUPS101.............................................. 25
5.1.3 Status Information................................................................................. 26
5.1.4 Basic displays....................................................................................... 27
6 Advanced Programming.................................................................................... 29
6.1 Adaptation to the source.............................................................................. 29
6.2 Adaptation to the battery ............................................................................. 29
6.3 Activation of the function Smart-Boost......................................................... 29
6.4 Adjusting the AC Output Frequency {1112}................................................. 29
6.5 Setting of the RCC remote control............................................................... 30
6.6 Setting of the language {5000}.................................................................... 30
6.7 Setting of time {5001} and date {5002}........................................................ 30
6.8 User level {5012}......................................................................................... 31
6.9 Drive the remote control to the user level basic {5019} ............................... 31
6.10 Information on the operating mode of the installation............................... 32
6.11 Display of the parallel and three-phase systems...................................... 34
7 Messages and account of events...................................................................... 35
7.1 (000) Alarm: Low battery voltage................................................................. 35
7.2 (003) Message: AC IN synchronization in progress..................................... 36
7.3 (004) Message: Wrong AC-In input frequency ............................................ 36
7.4 (006) Message: Too high AC-In input voltage............................................. 36
7.5 (007) Message: Too low AC-In input voltage............................................... 36
7.6 (008) Stop: Overload inverter SC ................................................................ 36
7.7 (014) Stop: Overtemperature EL ................................................................. 37
7.8 (015) Stop: Overload inverter BL................................................................. 37
7.9 (016) Alarm: Ventilation fault detected......................................................... 37
7.10 (018) Alarm: Excessive battery ondulation............................................... 37
7.11 (019) Stop: Too low battery voltage ......................................................... 37
7.12 (020) Stop: high battery voltage ............................................................... 37
7.13 (021) Message: Maximum Current of the source (Input limit) exceeded;
transfer prohibited................................................................................................. 38
7.14 (022) Error: Voltage at AC Out................................................................. 38
7.15 (023) Error: Phase not defined................................................................. 38
7.16 (024) Message: Control the battery of the clock...................................... 38
7.17 (041) Alarm: Overtemperature TR............................................................ 38
7.18 (042) Stop: Source at the output.............................................................. 38
7.19 (058) Error: Lost of synchro master.......................................................... 39
7.20 (059) Stop: Overload inverter HW............................................................ 39
7.21 (060) (061) Alarm: Maximum duration security for auxiliary contact......... 39
7.22 (062) Alarm: Genset problem, no AC-In after a start by means of the
auxiliary contact.................................................................................................... 39
7.23 Stored events........................................................................................... 39
7.24 Utilisation and access levels .................................................................... 40
7.25 Pre-defined functions of the auxiliary relays............................................. 40
7.26 Access to the parameters......................................................................... 40
7.26.1 Access to a parameter by its number................................................ 41
7.26.2 Access to a parameter via the menu ................................................. 41
8 Configuration for auxiliary contacts 1 and 2 {1201} {1310}................................ 42
8.1.1 Simple functions.................................................................................... 43
8.1.2 AUXILIARY CONTACTS 1 AND 2 EXTENDED FUNCT. {1489}.......... 49
9 Configuration of AC Transfer............................................................................. 51

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9.1 Activate immediate detection of grid outage (UPS) {1435}.......................... 51
9.2 Tolerance on the immediate detection of a grid loss {1510}........................ 51
9.3 Transfer AC-In for delayed transfer opening {1199}.................................... 51
9.4 Delay before passing to inverter {1198}....................................................... 51
9.5 Immediate transfer AC-In voltage {1200}..................................................... 51
9.6 Frequency delta accepted above End {1505}.............................................. 51
9.7 Frequency delta accepted below End {1506}.............................................. 52
9.8 Duration of erroneous frequency before disconnecting the transfer relay
{1507}.................................................................................................................... 52
9.9 AC-In current active filtering {1575}............................................................. 52
10 Intended Purpose Usage................................................................................ 53
10.1 Transportation and Storage...................................................................... 53
10.2 Authorized Persons.................................................................................. 53
10.3 Cleaning and Maintenance....................................................................... 53
10.4 Safety Precautions................................................................................... 54
10.5 Cleaning and Maintenance Intervals........................................................ 54
10.6 Aggressive substances and environments............................................... 54
10.7 Exposure to external stresses.................................................................. 54
11 Technical Data................................................................................................ 56
11.1 Specification............................................................................................. 56
Table 7.0............................................................................................................... 56
11.2 Product De-rating..................................................................................... 57
11.3 Replacement Parts................................................................................... 57
11.4 System Run Times................................................................................... 58
11.5 System Assembly Details......................................................................... 59
12 Warranty Information...................................................................................... 60
13 Type Codes .................................................................................................... 61
14 Certification..................................................................................................... 62
14.1 Atex Label................................................................................................ 62
14.2 Atex Certificate......................................................................................... 63
14.3 iUPS101 EC Declaration of Conformity.................................................... 68
14.4 UPS System EC Declaration of Conformity.............................................. 69
15 Manual Revision............................................................................................. 70

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1 Introduction
The iUPS101 Uninterruptible Power Supply system is certified for use in Zone 1
hazardous areas and provides back up of 120VAC or 230VAC up to 3KVA load
as a stand alone system, or up to 9kVA load as part of a modular parallel
system. Critical equipment, such as SIL rated control systems, navigation or
landing lighting, or blow out prevention systems, are protected in the event of a
blackout or brownout.
System run times are outlined in this manual, and are achievable when using the
iUPS101 in conjunction with the iBATT100 Zone 1 ATEX / IECEx certified 24V
Battery Enclosure. System run times can also be increased by specifying a 48V
system which uses two iBATT100 enclosures to more than double the backup
time of a standard 24V system.
Designed to be wall mounted the iUPS101 UPS system comprises an aluminium
alloy Ex’d’ charger/inverter enclosure close coupled to a stainless steel Ex’e’
terminal enclosure. This allows easy access to incoming/ outgoing cables thus
alleviating the need to open the Ex’d’ enclosure
The Ex’d’ enclosure has a glass window housing the UPS display which shows
live system information and allows configurable parameters to be set by the
user. Various alarm and status information can be configured using the Ex’d’
buttons on the front panel on the UPS. Also included are two user programmable
volt free contacts, which allow the user to utilize various UPS alarms and status
information.
The system includes advanced battery charge controls including built in
temperature compensation to ensure the correct charging of the lead acid
battery.

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2 Safety Information and Notes
2.1 Storage of this Manual
Keep this user manual safe and in the vicinity of the device. All persons who have to work on
or with the device should be advised on where the manual is stored.
2.2 Special Conditions for Safe Use
None
2.3 List of Notes
The notes supplied in this chapter provide information on the following.
•Danger / Warning.
oPossible hazard to life or health.
•Caution
oPossible damage to property.
•Important
oPossible damage to enclosure, device or associated equipment.
•Information
oNotes on the optimum use of the device
Warning Installation to be by skilled electricians and instructed personnel in
accordance with national legislation, including the relevant standards
and, where applicable, in accordance with IEC 79.17 on electrical
apparatus for explosive atmospheres.
Warning! The iUPS101 may only be operated in Zone 1 and Zone 2 hazardous
areas. Refer to the ATEX certificate for further information.
Warning! All parts of the enclosure must never be opened while energised, or
when an explosive gas atmosphere is present.
Warning! The iUPS101 has two different supplies. Both the AC mains input and DC
battery input must be isolated before accessing the enclosure
Important The technical data indicated on the iUPS101 ATEX rating plate, in this
manual and the ATEX certificate must be observed at all times.
Important The ATEX rating plate must be fitted at all times, if damaged it must be
replaced immediately or the iUPS101 must be removed from service and
the hazardous area.

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Important Changes in the design and modifications to the equipment are not
permitted.
Important The iUPS101 shall be operated as intended and only in an undamaged
condition.
Important Only suitably rated loads may be connected to the iUPS101.
Important For systems with periods of inactivity, such as a long shutdown or
moving/storing a mobile system where the UPS is not in use and there is
no AC mains supply. Users should remove DC supplies to the system
when not in use.
Caution The iUPS101 may weigh up to 90Kg, therefore ensure that the assembly
is mounted using suitable fixtures.
Caution Never operate the iUPS101 unit outside of its rated voltage, current &
power as indicated in the specification or the safety of the unit may be
impaired.
Caution Never exceed the maximum output loading of the iUPS101 as stated in
the specifications. Adequate protection such as a fuse / breaker must be
fitted to connecting equipment to prevent exceeding maximum load.
Important For the installation, maintenance and cleaning of the units, it is
absolutely necessary to observe the applicable regulations and
provisions concerned with explosion protection (EN60079-0:2009, EN
60079-14:2008) as well as the Accident Prevention Regulations.
Important The iUPS101 must not be stored or operated outside of its rated
temperature range as stated on the ATEX certificate.
Important Any unused cable entries must be fitted with a suitably certified blanking
plug to maintain the IP of the equipment
Important Under no circumstances must the close coupled Ex ‘e’ Terminal
enclosure be used to lift the iUPS101. This will cause stress on the cable
glands and invalidate the ATEX certification. The iUPS101 must only be
handled by way of the Ex ‘d’ enclosure

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3 Installation and Set-to-work
3.1 Installation
The iUPS101 is supplied ‘close-coupled’ to an Ex ‘e’ terminal box using potted cable
transits. All equipment is suitably certified, and assembled under the relevant codes
of practice (see section 7). This allows simple connection to suitably rated Ex ‘e’
cable terminals by the user.
For reference, the drilled cable entries on the bottom face of the Ex ‘d’ enclosure can
be up to 1-1/2”NPT type or up to M40. The information on the exact type of entry can
be found on the enclosure rating plate. The Ex ‘d’ box should never be opened apart
from scheduled maintenance / inspection by a qualified person. Please see Safety /
Information notes in section 2.
The iUPS101 is only permitted to be mounted in a vertical orientation.
The system weighs approximately 90Kg, so suitable lifting equipment and safety
provisions must be taken to ensure safe installation.
Correct Vertical Installation:
Fig 3.
Important! The information shown on the ATEX rating plate is in relation to the
safety of the equipment. The functional operating parameters of the
system may vary slightly. Please see section 7 for details

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3.2 Fitting the Cables
Warning! Installation to be by skilled electricians and instructed personnel in
accordance with national legislation, including the relevant standards
and, where applicable, in accordance with IEC 79.17 on electrical
apparatus for explosive atmospheres.
3.2.1 Grid-connected emergency systems
The UPS can be used as an emergency system, also known as an uninterruptible
power supply (UPS) – enabling a reliable supply to a site connected to an unreliable
network. In the event of an interruption to the energy supply from the public grid, the
UPS, connected to a battery, substitutes the faulty source and enables a support
supply to the users connected downstream.
These will be supplied as long as the energy stored in the battery allows. The battery
will quickly be recharged at the next reconnection to the public grid.
The AC input to the iUPS101 unit must be powered via an external site circuit
breaker/switch to allow disconnection of the power. This should be located close to
the unit and be suitably marked to identify it as the isolating device for the iUPS101
unit.
The use of the UPS must be carried out by qualified personnel who have been
checked by the responsible local authorities. The applicable local standards and
regulations must be adhered to.
3.2.2 Distributed Minigrid
The implementation of the UPS on top of a distributed minigrid requires special care
in choosing the distribution system. A TT distribution is recommended for the DC grid
as well as for the AC grid.
Warning! The IT system (Power distribution system which is isolated from earth) is
not recommended for the distribution. This distribution is generally
forbidden by local laws
3.2.3 Earthing system
The UPS is a protection class I unit, which is intended for cabling in a grid type TT,
TN-S or TNCS. The earthing of the neutral conductor *(E) is carried out at a sole
installation point, upstream of the RCD circuit breaker *(D).
*(E) Earth-neutral connection bridge:
The neutral is earthed at a single point of the installation, downstream of the source
and upstream of the protection device(s) at the default current (DDR). When several
sources are available, each source must have an earthed neutral. If the source has to
be retained with an isolated earthling system (IT) the applicable local provisions and
regulations must be applied.
*(D) Differential circuit breaker:
A protection device must be installed downstream of the source according to the local
requirements and in compliance with the applicable regulations and standards.

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The UPS can be operated with any earthing system. In all cases it is imperative that
the protective earth be connected in compliance with the applicable standards and
regulations. The installer is responsible for the conformity of the installation with the
applicable local standards.
3.2.4 Mobile installation or installation connected to the grid via plug connector
When the input of the device is connected directly to the grid via a plug, the length of
the cable must not exceed 2 m and the plug must remain accessible.
In the absence of voltage at the input, the neutral and live are interrupted, thereby
guaranteeing complete isolation and protection of the cabling upstream of the UPS.
The earthing system downstream of the UPS is determined by the upstream earthing
system when the grid is present. In the absence of the grid, the earthing system
downstream of the inverter is in isolated mode. The safety of the installation is
guaranteed by the equipotential bonding.
Warning! The connection (link) between the neutrals *(C) upstream and
downstream of the UPS is not permitted in this configuration.
*(C) Connection of the neutrals:
In a fixed installation where the neutral is connected to the earth at a single
installation point upstream of the UPS, it is permissible to carry out a connection of
the neutrals in order to preserve an unchanged earthing system downstream,
independent of the operating mode of the UPS. This choice shows the advantage of
keeping the differential protection devices downstream of the UPS.
This connection (C) is not permitted if a socket is installed upstream of the UPS.
This connection type guarantees the optimal continuity for supplying the UPS loads.
The first isolation fault will not lead to an interruption in the supply. If the installation
requires the use of a permanent isolation controller this would have to be deactivated
when the TT network is present at the UPS input .
Warning! All sockets and protection class I devices connected downstream of the
UPS must be properly connected to the earth (earthed socket). The
cabling rules above remain valid, including fixed installations, in all
cases where the UPS input is connected to the grid via a plug connector.
3.2.5 Fixed Installation
The installation may be equivalent to a mobile installation (with interrupted neutral). In
a fixed installation where the neutral is connected to the earth at a single installation
point upstream of the UPS, it is permissible to carry out a connection of the neutrals
in order to preserve an unchanged earthing system downstream, independent of the
operating mode of the UPS. This choice has the advantage of keeping the protection
devices downstream of the UPS. This connection can be carried out by modifying the
configuration using the control panel.
In this case the appearance of the first fault will lead to the installation stopping or the
disconnection of the protection devices upstream and/or downstream of the UPS.
Safety is guaranteed by the equipotential bonding and by any RCD circuit-breakers
placed downstream.
This connection (C) is not permitted if a socket is installed upstream of the UPS.

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3.2.6 Installation with automatic PE-neutral switching
In certain applications, it is desirable to keep the neutral upstream and downstream
of the UPS separated (C) while re-establishing the earthing system (TN-S, TT or
TNC-S) in the absence of voltage at the input. This can be programmed by the
configuration via the control panel. This modification must be carried out possessing
technical knowledge, at the responsibility of the installer and in conformity with the
applicable regulations and standards.
3.2.7 Connecting the cables
IMPORTANT! All cables should be connected to the iUPS101 via the correct
cable gland and fitted by a competent person.
IMPORTANT! Changes in the design and modifications to the equipment are not
permitted. If any changes are performed on the enclosure the
ATEX certification will become void.
Important The installer MUST ensure that all cables have adequate
mechanical protection to avoid damage to the wires.
IMPORTANT! Users must read the Installation and maintenance instructions
supplied for the iSTB Enclosure assembly before terminating any
cables. (Included in Chapter 10 for reference)
Remove the cover from the Ex ‘e’ Terminal box and fit the cables in the correct
positions shown below for your product:

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3.2.8 24V Cable Termination:
EN1
AC
OUT
X X XX X
- +
BATT
24V
XL2 EN2
X = Not connected
X X
L1
AC
IN
Auxiliar
Outputs +
Can Bus
See fig 3.5
Fig 3.2
3.2.9 48V Cable Termination:
EN1
AC
OUT
X X XX X
-+
BATT
24V
XL2 EN2
X = Not connected
L1
AC
IN
+
-
BATT
24V
Auxiliar
Outputs +
Can Bus
See fig 3.5
Fig 3.3

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3.2.10 Parallel AC Output Termination:
It is possible to parallel the AC outputs of up to 3 x iUPS101 systems together. A
maximum of 2 systems can be connected in the Ex ‘e’ terminal box to provide twice
the power – Contact Extronics before connecting systems in this manor. See
Fig 3.4
L1 EN1
MAINS
AC IN AC IN
Loop-
through
- +
BATT
24V
X- +
BATT
24V
L2 EN2
X = Not connected
AC
OUT
L3 EN3
Auxiliar
Outputs +
Can Bus
See fig 3.5
Fig 3.4
3.2.11 Auxiliary Output & CANBUS:
Fig 3.5

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3.2.12 Emergency Shutdown Signal
This signal is disabled by default. You must enter the Ex’d’ enclosure to enable this
functionality. More detail on the configuration and behaviour of this signal can be
found in section 4 of this manual.
Emergency shutdown signal is a ‘hot’ 24-48Vdc signal provided by the user. Please
see fig 3.5 for details. The signal is not polarity dependant, and therefore can be the
wires can be inserted in either of the terminals shown in fig 3.5.
3.2.13 CAN bus connections
These are not required on standalone iUPS101 units. These connections are used
when multiple iUPS101 units are connected in a parallel configuration (as per 3.2.10)
with a common battery bank. This is a communication connection between the UPS’s
and is used to allow synchronisation of the AC outputs for parallel UPS’s. Failure to
provide this connection could lead to the system failing to power on or stoppage of
the UPS.
If you are connecting units in parallel, please ensure you have consulted Extronics to
advise that systems are to be connected in this manor, as correct termination of
CANBUS cabling is required internally to the Ex’d’ enclosures. Providing you are
happy your UPS has been configured for parallel operation, you can connect the
CAN wires between the UPS’s as shown in section 3.2.11
Please note connecting cable should be a 3x twisted pair connected in a 1:1 manor
between each UPS.
3.2.14 Connecting the AC supply sources
The UPS is intended to be supplied by alternative voltage sources such as the public
grid or a generator. Check that the rated voltage of the source corresponds to the
rated voltage of the UPS specified on the rating plate.
The source must be connected to the correct ‘Mains AC IN’ shown in the product
diagrams above with sufficient wire section at least equal to the max AC input current
shown in the table 3.0 below.
The AC input current ratings are higher than the output ratings as the system may be
supplying the load and recharging the batteries at the same time following a
discharge.
Important! There is no circuit protection on the AC input to the UPS. Users should
provide adequate protection against overload by way of a suitable circuit
protection device such as a RCB / MCB or fuse that is correctly rated for
the system– see the table below.

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iUPS101 Max
Rated Power (VA) 230V System Max AC input current (A) 120V System Max AC input current (A)
Up to 3000 27 50
Up to 2500 24 44
Up to 2000 21 39
Up to 1000 16 28
Table 3.0
3.2.15 Connecting the AC output
High voltages may be present on the connection terminals. Make sure that
the inverter is deactivated and that there is no AC or DC voltage present on the AC
IN terminals and battery terminals, before proceeding with the connection.
The AC output connections must be wired with sufficient wire section at least equal to
the max AC output current of the Product shown in table 3.1 below:
iUPS101 Max
Rated Power (VA) 230V System Max AC output current (A) 120V System Max AC output current (A)
Up to 3000 15 30
Up to 2500 12 25
Up to 2000 10 20
Up to 1000 5 10
Table 3.1
3.2.16 Connecting the battery
IMPORTANT! Before connecting the battery, carefully check the voltage and
polarity of the battery using a voltmeter. Incorrect polarity or
surge voltage may seriously damage the device.
IMPORTANT! For systems with periods of inactivity, such as a long shutdown
or moving/storing a mobile system where the UPS is not in use
and there is no AC mains supply. Users should remove DC
supplies to the system when not in use.
The iUPS101 is designed to be used in association with the iBATT100 Zone 1 battery
enclosure. Terminate the battery cables to the appropriate connections shown in the
diagrams above.

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3.2.17 Wiring auxiliary contacts
These contacts are reversing contacts that are potential-free. The admissible
currents and voltages for these contacts are 12A: 250 VAC/24VDC or 3A: 50 VDC
max. The cabling of these auxiliary contacts depends solely on the application and
cannot be described in this manual. These auxiliary outputs are not intrinsically safe,
and if used, the cabling / connected equipment must be taken to a safe area.
For more information on configuring the auxiliary contacts, please see chapter 8 of
this manual.
3.3 Setting to work
Once all cables are connected correctly and inspected, refit the enclosure lid using
the four screws previously removed. Connect the battery cables within the battery
enclosure – consult iBATT100 operating manual.
Note! Ensure the lid is secure, correct cable glands are fitted and the
unit device correctly wired and earthed for the particular
application before applying power
Note! Ensure that the lid gasket is clean and undamaged before fitting
the lid.

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3.4 Fusing
All fuses for the system are supplied fitted and contained within the Ex ‘d’ enclosure
and protect against system faults or overload. Should the fuses blow or need to be
inspected, only a qualified person must open the Ex ‘d’ enclosure – see section 2.
Fig 3.5
3.4.1 Fuse Values
DC Battery protection fuse, F1 = 160A
AC output fuse, F3 See table 3.2
Output Power (kVA)
230V System Max AC
output current (A) 120V System Max AC output current (A)
Up to 3000 15 30
Up to 2500 12 25
Up to 2000 10 20
Up to 1000 5 10
Table 3.2
Caution! Only the fuse values listed in the table above may be fitted to the
iUPS101. Failure to fit the correct fuse will invalidate the ATEX
certificate. Fuses must not be replaced without further
investigation as to the cause of the failure. If in doubt, please
contact Extronics

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4 Description and Functioning
4.1 Circuit Diagram
4.2 Description of the main functions
4.2.1 Overview
The iUPS101 contains two major components which work completely independently
to each other to give a high performance industrial inverter charger with the additional
protection required for charging of batteries in hazardous areas. The first component
is the main UPS inverter charger as depicted in the circuit diagram above, and the
second component the Extronics bespoke design battery charge protection circuitry.
4.2.2 Inverter
The IUPS101 is equipped with a high-performance inverter which supplies a perfect
and very precise sine wave. Any unit designed for the 230 V/50 Hz electrical grid may
connect to it without any problem, up to the rated power out of your IUPS101. The
inverter is protected against overloads and short-circuits.
4.2.3 Battery protection circuit
This bespoke circuitry works completely independently to the UPS, providing a fault
tolerant battery charge protection required as per EN60079-7:2007 for charging of
batteries in a hazardous areas. Its function is to monitor the charging voltage and
current from the inverter / charger to ensure they do not exceed dangerous limits
advised by the battery manufacturer. In the event of battery charge failure the battery
protection circuit will ‘trip’ causing the connection between the UPS and the batteries
to be isolated and prevent any dangerous fault conditions transferring to the
batteries.

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4.2.4 Automatic load detection
In order to save battery energy, the IUPS101 inverter stops and automatically goes
into load search when the detected load is lower than the sensitivity set by the
configuration. It automatically goes back into operation when a power consumer
greater than this value demands it.
4.2.5 Transfer relay
The IUPS101 can be connected to an alternative power source such as a generator
or public network. When the voltage at the entry satisfies the voltage and frequency
parameters, the transfer relay will be activated after a delay. This delay may be
adjusted (extended) to allow a fully stable status of the generator before transfer.
When the transfer relay is activated, the voltage present at the input of the iUPS101
is available at the output for the consumers connected. At the same time the battery
charger goes into operation.
Important When the transfer relay of the iUPS101 is active, the voltage at the output
of the IUPS101 is equivalent to that which is present at the input and
cannot be influenced or improved by the iUPS101. The consumers are
supplied by the source present at the “AC IN” input via the transfer relay.
The maximum current of the transfer relay is 50 A. The sharing of energy between
consumers and the battery charger is adjusted automatically. The transfer relay will
be deactivated when the input voltage no longer satisfies the voltage and frequency
requirements at the input or when the current limit is exceeded. If the exceeding of
this limit is prohibited, the UPS passes immediately into inverter mode. In this case
the loads are supplied exclusively by the battery via the inverter. This switching
always takes place automatically. The presence of increased dynamic loads (such as
pneumatic angle grinders, etc.) may lead to an undesirable opening of the transfer
relay due to the weakness of the source. To this case, a delay in the opening of the
transfer relay can be adjusted. The transfer normally takes place without any
interruption when the generator stops. It would typically be 40 ms in the event of the
immediate loss of input voltage at “AC IN”.
4.2.6 Fast voltage loss detection mode (fast transfer):
When the iUPS101 is connected to the public grid or to a generator supplying stable
and clean AC voltage, a fast voltage loss detection mode can be used. In this mode,
perturbation or lack of voltage of less than 1 millisecond can be detected, switching
the unit in inverter mode immediately.
The sensitivity of this detection is adjustable. This mode guarantees a zero or
maximum of 15 ms transfer time, and should not be used in presence of highly
disturbed utility grid or with a low power generator or a generator supplying a poor
quality voltage.