COMEX COVER MZ Series User manual

COMEX S.A.
Uninterruptible Power Supply
COVER MZ
20-30-60-80 kVA
User manual

COMEX S.A.
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and can not be reproduced without prior permission.
We reserve the right to modify the design and specifications without
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Copyright 2018
COMEX S.A.
All rights reserved.

COMEX S.A.
Table of contents
1. Precautions ......................................................................................................................................1
2. Installation procedure......................................................................................................................3
2.1. Introduction...............................................................................................................................3
2.2. Preliminary checks ....................................................................................................................3
2.3. Location .....................................................................................................................................4
2.3.1. UPS room ...........................................................................................................................4
2.3.2. Battery room......................................................................................................................4
2.3.3. Storage ...............................................................................................................................4
2.4. Unpacking, checking and setting...............................................................................................4
2.4.1. Unpacking ..........................................................................................................................4
2.4.2. Design and dimensions of the UPS ....................................................................................6
2.4.3. Service space......................................................................................................................7
2.5. Safety elements.........................................................................................................................8
2.5.1. UPS input power supply.....................................................................................................8
2.5.2. Battery circuit protection...................................................................................................9
2.6. Power cords.............................................................................................................................10
2.6.1. Maximum currents of the power supply .........................................................................11
2.6.2. Connecting wires..............................................................................................................12
2.7. Communication .......................................................................................................................14
2.7.1. Extended communication card Dry Contact....................................................................14
2.7.2. Control module ................................................................................................................15
2.7.3. SNMP card........................................................................................................................15
2.7.4. Monitoring card ...............................................................................................................15
3. UPS operation modes ....................................................................................................................17
3.1. Introduction.............................................................................................................................17
3.2. Principle of operation..............................................................................................................17
3.2.1. Bypass module .................................................................................................................18
3.3. Power supply operation modes ..............................................................................................18
3.3.1. Online mode.....................................................................................................................18
3.3.2. Battery mode ...................................................................................................................18
3.3.3. The restart mode of the power supply after power back ...............................................19
3.3.4. Bypass mode ....................................................................................................................19
3.3.5. Service bypass..................................................................................................................19
3.3.6. ECO mode ........................................................................................................................19
3.3.7. Frequency converter mode .............................................................................................19
3.3.8. Parallel mode ...................................................................................................................20
4. User manual...................................................................................................................................21
4.1. Power connectors ...................................................................................................................21
4.2. Procedures for starting the power supply - single operation .................................................22
4.2.1. Starting the UPS from complete shutdown.....................................................................22

COMEX S.A.
4.2.2. Starting UPS with the battery pack..................................................................................23
4.3. Procedures for switching the power supply between operating modes................................23
4.3.1. Switching from normal operation to battery operation..................................................23
4.3.2. Switching from normal operation to Bypass operation ..................................................23
4.3.3. Switching from Bypass mode to normal operation.........................................................24
4.3.4. Switching from normal operation to service Bypass mode.............................................24
4.3.5. Switching from service Bypass mode to normal operation.............................................25
4.4. The procedure of complete switching off the power supply (power supply by mechanical
bypass). ..............................................................................................................................................25
4.5. Emergency shutdown using EPO.............................................................................................25
5. LCD panel operation ......................................................................................................................26
5.1. Introduction.............................................................................................................................26
5.2. Indication of UPS operation status on the display..................................................................27
5.3. Reading work parameters .......................................................................................................31
5.3.1. Power supply to bypass track ..........................................................................................31
5.3.2. Power supply to the rectifier's track................................................................................31
5.3.3. Battery..............................................................................................................................32
5.3.4. UPS output .......................................................................................................................32
5.4. Reading information about UPS (Event log) ...........................................................................32
5.4.1. Event Log..........................................................................................................................33
5.4.2. User Log ...........................................................................................................................33
5.4.3. Information about the device..........................................................................................33
5.5. System configuration settings.................................................................................................34
5.5.1. Power parameters ...........................................................................................................34
5.5.2. Battery settings................................................................................................................35
5.5.3. Battery tests.....................................................................................................................36
5.6. Special functions .....................................................................................................................37
5.7. Display settings........................................................................................................................37
5.8. Password settings....................................................................................................................37
5.9. System speaker .......................................................................................................................38
5.10. Turn On/Off .........................................................................................................................38

COVER MZ series - User manual
COVER-ENERGY SA
1
1. Precautions
This user's guide contains the necessary information on the installation and use of MZ COVER
power supplies.
Before installing and using, please read the manual carefully.
The UPS must be installed and configured by an authorized service center of the manufacturer
or distributor.
In the case of installations by persons without the required experience, there is a risk of users
being exposed to health or life. Persons not entitled to the installation may damage the power
supply, which in this case is not subject to the terms of the warranty.
FULFILLED STANDARDS
The device complies with the directives CE 73/23 and 93/68 (low voltage safety) as well as
89/336 (EMC) and the following standards:
*IEC62040-1-1
*IEC/EN62040-2 EMC CLASS C3
*IEC62040-3
NOTE - Large leakage current
The connection of the protective conductor (PE) is essential and must be made before
connecting the remaining working conductors (power supply, consumer, battery).
Grounding should be carried out in accordance with prevailing standards and practical
knowledge applicable at the place of installation.
The leakage current exceeds 3.5 mA and is less than 1000 mA.
When choosing immediate-action RCCB or RCD devices, the transient and fixed leakage
currents that may occur during commissioning must be taken into account.
Select residual current circuit breakers (RCCB) that are sensitive to unidirectional DC current
pulses (Class A) and insensitive to transient current pulses. It should also be remembered
that a given RCCB or RCD device conducts the leakage currents of the receiver.
Operation
There is dangerous voltage in the uninterruptible power supply housing. The risk of contact
with such a voltage is kept to a minimum, as live components are behind a closed housing.
Additional internal protective covers make the device protected in accordance with IP20
protection class.
Normal operation of the device, taking into account the recommended operating
procedures, poses no threat to personnel.
All maintenance and service procedures require access to the interior of the device and
should only be carried out by trained employees.
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High battery voltage> 400 Vdc
All work related to the operation and installation of batteries can be performed by a properly
trained service.
After connecting the battery, the voltage at their terminals exceeds 400 Vdc and is
potentially lethal.
Battery manufacturers give detailed precautions that must be followed when working on or
around battery-powered large batteries. Such measures should always be strictly observed.
Particular attention should be paid to recommendations regarding local environmental
conditions and the provision of protective clothing, first aid and fire-fighting equipment.
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2. Installation procedure
This chapter is devoted to the method of installation, method of laying and wiring of the UPS.
2.1. Introduction
The chapter presents the basic requirements for the location and wiring of the power supply.
The description presents a step by step installation instruction, which is a series of guidelines
for the service to be followed during assembly.
Warning - Installation may only be carried out by an authorized service center
1. Do not connect electrical equipment to the power supply before finding a service
technician that the power supply is properly connected and configured.
2. The UPS should be installed by qualified technical personnel in accordance with the
guidelines contained in this chapter.
Do not perform any electrical work interfering with the electrical installation before and after
the UPS, during operation of the UPS system. Damages resulting from this title (eg change of
phase sequence) are not covered by the guarantee.
Warning: dangerous batteries
Special precautions must be observed when working with batteries connected to the power
supply. After connecting the battery, the voltage on the terminals exceeds 400 Vdc and is
potentially fatal.
To protect your eyes against accidental arcing, it is recommended to use safety goggles.
Additionally, it is recommended to:
Remove rings, watches and all metal objects.
Only use tools with insulated handles.
If electrolyte leaks from the battery or the battery is otherwise damaged, it must be
replaced. Damaged batteries should be stored in a container resistant to sulfuric acid
and disposed of in accordance with local regulations.
If the electrolyte comes into contact with the skin, immediately contaminate the
contaminated area with water.
2.2. Preliminary checks
Perform the following checks before installing:
Check visually that the supplied devices, i.e. the UPS and batteries, have not been
damaged as a result of their transport. Damages should be reported immediately to the
supplier.
Verify compliance of the delivered equipment with the installation requirements. The
power of the PSU is described on the label each time.
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2.3. Location
2.3.1. UPS room
The UPS is intended for indoor installation. The device should be in a clean environment with
adequate ventilation to maintain the ambient temperature within the required specification
range. The UPS provides forced convection cooling via internal fans. Cold air enters the device
through ventilation openings located in the front part of the housing and is blown out by grills
in the back of the housing. Do not block the ventilation openings.
Depending on the room conditions, the ventilation openings of the power supply should be
regularly cleaned, eg with a vacuum cleaner. The ventilation will ensure efficient cooling and
will extend the life of the device.
Note: The UPS should be installed on a stable and non-flammable substrate.
2.3.2. Battery room
Battery temperature should be stable, as it is the main parameter affecting the battery life and
capacity. The optimal battery temperature is 15-25 ° C. It is recommended to maintain a nominal
temperature of 20 ° C.
Working at a higher temperature will shorten the battery life, and at a lower temperature will
reduce their capacity. Any increase in battery operating temperature by a further 8 ° C, reduces
the service life by 50%.
Keep batteries away from heat sources and hot air outlets.
When installing the battery outside the UPS, use the battery circuit protector located as close
as possible to the battery. The cables connecting the batteries and the UPS should be as short
as possible.
2.3.3. Storage
If the device is not installed and requires storage, protect it from excessive moisture and high
temperatures. Store batteries in a dry and cool room. The most suitable storage temperature
for batteries is 20-25 ° C. If the device has not been installed immediately after delivery, store it
in a room to protect it from excessive moisture and heat sources.
2.4. Unpacking, checking and setting
Before unpacking, carefully inspect the delivered packaging of the device for damage during
transport. After removing from the packaging, check that the equipment does not show signs
of damage. If any damage occurs, please report it to the supplier immediately.
2.4.1. Unpacking
The power supply is delivered in a cardboard package on a wooden pallet. For unpacking,
remove the carton and protective foams inside the package. The device shown below is shown
after disassembling the packaging.

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Figure 2-1 View of the sample power supply after disassembling the packaging
Note: Remove the screws that connect the UPS enclosure to the wooden pallet, then place the
power supply at the point of installation using the exit provided in the UPS enclosure.
Disassembly should be carried out carefully so as not to damage the housing.
The 60kVA power supply is equipped with brake wheels, and the 80kVA power supply has
additional feet to stabilize the UPS after it has been positioned at its destination, as shown
below.
Check the correctness of the delivered equipment on the label located on the back of the UPS
door. The label contains basic information about the model, power, etc.
Note: Dispose of the safety materials (wood, plastic, etc.) after disassembly in accordance with
the applicable local environmental regulations.
In order to extend the service life of the device, it is necessary to provide a suitable place for its
installation, which should guarantee:

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Protection against gases and vapors that may cause corrosion
Easy connection to the electrical system
Sufficient service space
Protection against excessive moisture and heat source
Suitable fire protection
The working temperature should be in the range of 20-25ºC. At this temperature, the
batteries exhibit optimum performance.
2.4.2. Design and dimensions of the UPS
The appearance and dimensions [mm] of the UPS are shown in the figures below:
Figure 2-2 The front / side view of the MZ 20K,30K UPS
Figure 2-3 The front / side view of the MZ 60K UPS

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Figure 2-4 The front / side view of the MZ 80K UPS
2.4.3. Service space
There are no ventilation openings on the side walls of the power supply, therefore no free space
is required from the side for ventilation purposes. However, for access to the device from each
side, it is recommended to keep min. 50 cm of service space.
It is required to provide adequate space from the front of the power supply for easy operation
and the possibility of drawing cold air from the environment. Recommended space from the
front 80 cm. Due to the required access to the back of the power supply and the free air blow
and circulation, the recommended space from the back of the power supply is 50 cm.

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2.5. Safety elements
For safety reasons, it is necessary to install appropriate protections in the form of circuit
breakers or other protective devices in the UPS power supply switchboard. This chapter
provides general practical information for the installation needs of qualified electricians. In
addition, personnel with appropriate knowledge and qualifications should have knowledge
about standards on the local market regarding the type and cross-sections of cables, their
arrangement and loadability. It is recommended to use flexible LgY or OpD type hoses.
2.5.1. UPS input power supply
The UPS should be supplied from an electrical switchgear equipped with a suitable security
device selected for the maximum system power, and flexible hoses with appropriate current
carrying capacity matched to the protection used.
≥500

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If it is required to install RCDs on the UPS, please note that these devices should:
be sensitive to unidirectional DC current pulses (class A)
not be sensitive to transient current pulses
have adjustable sensitivity in the range of 0.3 - 1A.
The RCD must be sensitive to unidirectional DC current pulses, and insensitive to transient
current pulses, as shown in the figure below:
Figure 2-5 Marking the RCD
2.5.2. Battery circuit protection
The battery required for the correct operation of the power supply consists of 30 - 40 12 V
batteries connected in series. A 3 wire installation is required with a neutral center point, taken
from the central connection between the 20 and 21 batteries, in the case of a 40-battery chain.
The battery circuit must be protected by a suitable fuse, selected according to the UPS power.
A detailed drawing of the battery installation is shown below:
Figure 2-6 Diagram of connection in series 40pcs of battery with a central center point

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2.6. Power cords
The main factors that influence the selection of wires are the supply voltage, the current, and
the room temperature and cable installation conditions.
The system power cords must be selected in accordance with applicable regulations at the place
of installation and be consistent with the following description:
The input power supply cables must be matched to the maximum input current and the
maximum battery charging current indicated in the table below, taking into account the power
rating of the power supply and the AC input voltage.
The output and bypass cables must be matched to the rated output current given in the table,
taking into account the power rating of the power supply and the AC output voltage.
Battery cables must be matched to the discharge current of the battery at the voltage at the
end of discharge, given in the table, taking into account the power rating of the PSU.
The terminal strip for connecting the power / supply wires is located on the front of the power
supply. On the strip, screw-eye connections are used.
The cable connection is located on the bottom of the power supply shown in Figure 2-7.
Figure 2-7 View of the front wall of the power supply and the place where the wires are connected

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Figure 2-8 View of the bottom of the power supply and the MZ 20K,30K (left), MZ 60K (center) and MZ 80K (right)
Warning
BEFORE PERFORMING THE WIRING OF THE POWER SUPPLY, MAKE SURE THAT THE POSITION
AND FUNCTION OF EXTERNAL DISTRIBUTES WILL COMBINE THE INPUT / OUTPUT POWER
SUPPLY WITH A POWER DISTRIBUTION PANEL.
CHECK THAT THE FOREGOING POWER SOURCES ARE ELECTRICALLY DISCONNECTED AND
THEN INSERT YOUR NECESSARY KEY WARNINGS TO PREVENT THEIR INCIDENT INCLUSION SO
THAT THE VOLTAGE DOES NOT APPEAR ON THE CABLES WHEN THE UPS IS POWERED.
2.6.1. Maximum currents of the power supply
The currents for the maximum system power given in the table below, depending on the
power of the system. The given currents are used to select the appropriate protections in the
power, battery and receiver lines as well as the appropriate cable cross-sections. Currents
given at 230 / 400Vac installation.
Table 2-1 Power supply table
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System
MZ 20,30K
MZ 60K
MZ 80K
Power
20,30kVA
60kVA
80kVA
Dimensions [mm]
(W x D x H)
321 x 840 x 1428
450 x 840 x 967
450 x 840 x 1400
Input
Nominal
current [A]
52
103
132
Output
Nominal
current [A]
43
87
116

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Warning
The power supply requires the connection of a PE protective conductor. Incorrect connection
of the protective conductor may cause the EMI filters to malfunction and result in electric
shock or fire.
2.6.2. Connecting wires
Warning
The operations described in this chapter should be performed by a properly trained team of
service technicians. The contracting authority is responsible for preparing the power supply
and receiving installation for the power supply.
Figure 2-9 View of terminal block for connecting MZ 20K,30K cables
Figure 2-10 View of terminal block for connecting MZ 60K cables
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Figure 2-11 View of terminal block for connecting MZ 80K cables
After properly setting and securing the power supply before moving it, connect the wires with
the following rules:
1. Check that the power supply is completely disconnected from the external power source
and that the service Bypass switch on the power supply is open. Ensure that these power
sources are electrically isolated and arrange the necessary warning signs to prevent them
from being accidentally switched on.
2. Open the front door of the power supply and remove the bezel to gain access to the place
where the power cords are inserted. A terminal strip for connecting wires is located in the
front of the power supply. Connecting the battery in the MZ 60K and MZ 80K UPS from the
rear of the power supply.
3. Connect the protective ground wire. The connection must comply with local regulations and
applicable standards.
4. Connect the UPS power supply (rectifier and bypass).
5. Connect the power cords between the UPS and the battery disconnector. Check the correct
polarity.
Warning - Hazardous voltage at the battery terminals
Make sure that the polarity of the battery is correctly connected. Positive terminal of battery
to positive terminal (BAT +) on UPS, negative terminal of battery to negative terminal (BAT-
) on UPS, neutral terminal of battery to neutral terminal (N) on UPS.
6. Install the protective cover and the power supply cover.
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2.7. Communication
Communication interface of the COVER MZ 60K power supply is located behind the front door
of the power supply, and consists of master control module (1), slave control module (2 -
option), SNMP card (3 - option), extended relay card DryContact (4 - option) , monitoring cards
(5) and the UPS start button from the "Cold Start" battery (6).
Figure 2-12 Communication interface of the MZ 60K power supply
The communication interface of the COVER MZ 80K power supply is located behind the front
door of the power supply, and consists of an extended DryContact relay card (1 - option), slave
control module (2 - option), master control module (3), SNMP card (4 - option) and monitoring
cards (5).
Figure 2-3 Communication interface of the MZ 80K power supply
The cables connected to the DryContact interface must be potential-free and separated from
the AC working conductors. Wires should be double insulated with a cross-section of 0.5 - 1.5
mm2, and their maximum length should not exceed 50m.
2.7.1. Extended communication card Dry Contact
The extended Dry Contact card allows you to connect seven additional signals, including four
input signals and three output signals. The description of signals is presented in the table below:

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Table 2-2 Output signals
No.
Description
Signal
Description
1
ND5
The signals can be set as: triggering
the battery switch in case of EPO
activation, output signal informing
about the position of the output
disconnector in the OFF position,
bypass operation, synchronization
signal, start or stop signal of the unit
operation.
The occurrence of the event results
in the closing of NO-COM pins and
the opening of NC-COM pins.
Permissible values of 1A / 250V
signals.
2
ND6
3
ND7
4
ND8
Table 2-3 Input signals
No.
Description
Signal
Description
1
ND9
Input signals from external devices
informing about the operation of
the unit, power supply failure at the
UPS input or grounding of the
battery.
The occurrence of the event results
in the closing of NO-COM
2
ND10
3
ND11
4
ND12
Reserve
The occurrence of the event results
in the closing of NO-COM
2.7.2. Control module
The UPS is equipped as standard with a control module that manages the operation of the UPS,
which is also used for parallel communication of the power supplies. An optional solution is a
redundant control module card, acting as a redundant module, which is standard equipment in
the case of a parallel system.
2.7.3. SNMP card
The SNMP card allows the user to remotely manage and read device operation parameters via
the network. A detailed description of the possibility of the SNMP card contained in it in the
instruction manual of the card.
2.7.4. Monitoring card
The monitoring card enables communication by means of Modbus and RS-485, additionally
has 6 dry contact contacts (3 input ports and 4 output ports).

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Table 2-4 Output signals
No.
Description
Signal
Function
1
ND1
UPS fail
The occurrence of the event results in the closing of
NO-COM pins and the opening of NC-COM pins.
Permissible values of 1A / 250V signals.
2
ND2
No supply
The occurrence of the event results in the closing of
NO-COM pins and the opening of NC-COM pins.
Permissible values of 1A / 250V signals.
3
ND3
Low battery voltage
The occurrence of the event results in the closing of
NO-COM pins and the opening of NC-COM pins.
Permissible values of 1A / 250V signals.
Table 2-5 Input signals
No.
Description
Signal
Function
1
EPO1
External NO signal from the
emergency switch REPO
The occurrence of the event requires
the closing of the NO-COM pins.
2
EPO2
External NC signal from the
emergency switch REPO
The occurrence of the event requires
the closing of the NC-COM pins.
3
ND4
External bypass service signal
The occurrence of the event requires
the closing of the NO-COM pins.