Qoltec 53044 UPS User Manual

Brand: Qoltec

Model: 53044

Introduction

This user manual provides comprehensive instructions for the Qoltec 53044 Uninterruptible Power Supply (UPS), covering safety guidelines, installation procedures, operational modes, troubleshooting steps, maintenance, and detailed product specifications.

Please comply with all warnings and operating instructions described in this manual and read all the precautions before installing. Before operating this product, be sure to review all safety and operational instructions.

1. Safety Instruction

Please read the manual and safety instructions before installing and using this product.

1-1. Transport and storage

When you need to carry the UPS system, be sure to use the original packaging material to prevent and mitigate accidental shocks. The place where the UPS product is stored must be dry and well ventilated.

1-2. Preparation

When the UPS system is moved to an indoor warm environment directly from a cold environment, condensation may occur. At this point, be sure to wait until the UPS system is completely dry. Therefore, after moving to the installation site, please wait at least 2 hours for the UPS to adapt to the environment before installation. The UPS system must not be installed in the vicinity of water or a moist environment. The UPS system must not be installed in a location exposed to direct sunlight or near a heat source. Prevent any liquid or other foreign object from entering the UPS system. The operation of this UPS system can be carried out by inexperienced persons.

1-3. Installation

Never connect to the UPS's output devices that can cause the UPS to be overloaded, such as high-power motor equipment. Power lines and other lines in the wiring should avoid places where they might be stepped on or tripped over. Never block or cover the ventilation holes on the UPS housing. The location of the UPS installation must be well ventilated; confirm that there is sufficient ventilation around the UPS. The UPS is equipped with a ground terminal; for installation completion, an external UPS battery box connected to constitute the electric potential grounding is required. The UPS can only be installed by a professional qualified personnel. The construction system should provide a short circuit protection device. The building system should be equipped with a lumped emergency switch so that, when needed, all UPS power supply can be shut down in a timely manner. Before connecting the UPS to the building system, it is first necessary to connect the UPS to the ground. Installation and wiring must comply with local electricity laws and regulations.

1-4. Operation

Do not disconnect the grounding cable of the UPS or the grounding cable of the building system, otherwise, the protective grounding of the UPS system and the connected load will fail. The UPS is characterized by its own internal battery, so even if the UPS is not connected with any building wiring system, the output terminal block may still be charged. If you need to completely disconnect the UPS system, first press the "OFF" key, and then disconnect the main power supply.

1-5. Applied Standard

Category	Standard	Details
Safety	IEC/EN 62040-1
EMI	Transmit radiation	IEC/EN 62040-2, Category C3
EMI	Electromagnetic radiation	IEC/EN 62040-2, Category C3
EMS	ESD	IEC/EN 61000-4-2, Level 4
	RS	IEC/EN 61000-4-3, Level 3
	EFT	IEC/EN 61000-4-4, Level 4
	SURGE	IEC/EN 61000-4-5, Level 4
	CS	IEC/EN 61000-4-6, Level 3
	Low frequency magnetic field	IEC/EN 61000-4-8, Level 4
	Low frequency signals	IEC/EN 61000-2-2

2. Install and Setting

Model	53044
Type	Standard Machine

2-1. Unpacking and inspection

Please open the package and check whether the following items are complete. The package contains the following items:

UPS main unit
User manual

Note: Before installing, please review the contents of the package to confirm that there is no suspected damage or abnormal damage. If you have any damage or missing parts, please do not use this product, but should immediately notify the courier and your dealer. Please keep the original packaging materials for future use.

2-2. Backplane view

The backplane of the UPS unit features several components:

① Computer interface
② Smart slot
③ Fan
④ Parallel port cover plate (Combination card is optional)
⑤ Input protection switch
⑥ Maintain switch cover plate (Maintain switch is optional; Professional version has it installed)
⑦ Terminal block cover plate
⑧ Beam line frame
⑨ EPO (Emergency Power Off) (only for Professional version)

Wiring specifications (AWG): Input: 8, Output: 8, Battery: 8 (Long machine), Ground Line: 8.

Note 1: It is recommended to use the above recommended or higher specifications of wire to take into account safety and efficiency. The standard machine does not require a battery cable.

Note 2: The color of the wire must be in accordance with the local electrical code.

Ground wire connection: Remove the terminal cover on the rear panel of the UPS. Then connect the ground wire according to the schematic diagram. When wiring, first connect the ground wire, and keep it connected until the final removal of wiring.

Single-phase terminal block: This block includes terminals for Battery, Input (L, N, empty), and Output (L, N, empty).

Model: 53044

Note 1: Make sure that all wires on the terminals are locked and fixed.

Note 2: Install the output circuit breaker between the output terminal and the load device, and make sure that the circuit breaker has a leakage protection function.

Note 3: Replace the terminal cover back in place.

Warning: Before installation, ensure the UPS is not yet open. Do not open the UPS before installation. Do not attempt to convert the standard UPS into a long-running machine. In particular, the standard built-in battery cannot be connected to external batteries, as their specifications and voltage may differ, potentially causing electric shock or fire hazards.

Warning: In the standard battery cabinet, a DC circuit breaker is provided to disconnect the battery cabinet and UPS. However, for external batteries, ensure a DC circuit breaker or other protective device with the same function is provided between the UPS and the external battery. If not, be careful when installing an external battery. When using a circuit breaker, please disconnect the battery breaker first, then install it.

2-3. Main Unit installation

Installation and wiring are subject to local electrical codes and laws and must be performed by professional electricians:

Make sure that building distribution lines and circuit breakers are sufficient to support the UPS capacity to avoid electric shock or fire accidents. Note: Do not use a wall outlet as a UPS input power (the rated current is less than the maximum input current of the UPS), otherwise, the socket may be burned.
Before installing, turn off the power switch in the room.
All load equipment must have their power turned off first, then connect the UPS system.
Prepare the wire according to the following table.

3. Operation

3-1. Buttons function

BUTTONS	FUNCTION
START (ON/ENTER)	START: Press the button for over 1 second to start UPS. CONFIRMATION: Press to confirm in setup menu.
OFF (ESC)	Shutdown: Press this button for more than 1 second to turn off. Cancel: In the setup menu, press this button to return to the previous menu.
TEST (UP)	TEST: Press the button for over 1 second to test battery in main supply mode. UPWARD: Press to choose the next option in setup menu.
MUTE (DOWN)	MUTE: Press the button for over 1 second to erase alarm (refer to 3-4-9 for details). DOWNWARD: Press to choose the upper option in setup menu.
TEST (UP + MUTE/DOWN)	Press the two buttons at the same time to access or quit the setup menu.

CVCF mode refers to constant voltage and frequency mode.

3-2. LED indicator light and LCD display screen

LED INDICATOR: There are 4 LED indicator lights designed on the front panel, showing the UPS running status.

Status	LED	Bypass Mode	Line	Battery	Fault
Bypass Mode	LED Light On	●
AC Mode	LED Light On		●
Battery Mode	LED Light On			●
CVCF Mode	LED Light On		●
Battery Test	LED Light On			●
Fault	LED Light On				●

Remarks: LED Light On, LED Light Off.

LCD SCREEN: The LCD screen displays various information including Input & Battery Voltage Info, Fault status, Output & Battery Voltage Info, Load Info, Battery Info, Backup Time Info, Fault Info, and Mute Operation status.

Display Descriptions:

Backup Time Info: Displays backup time in Hours (H) and Minutes (M).
Fault: Displays fault code when a fault occurs. Refer to section 3-9 for fault code meanings.
Output & Battery Voltage Info: Shows Output voltage (Vac), frequency (Hz), or Battery voltage (Vdc).
Load Info: Displays segment display for loading capacity (0-25%, 26-50%, 51-75%, 76-100%).
Other Running Info: Indicates status like Main supply connected, Battery on work, Bypass on work, Inverter on work, Output on work. Also shows Overload and Short circuit status.
Battery Info: Segment display for battery capacity (0-25%, 26-50%, 51-75%, 76-100%).
LOW BATT.: Indicates low battery capacity.
Input & Battery Voltage Info: Displays Input voltage (Vac), frequency (Hz), or Battery voltage (Vdc).

3-3. Warning

This table lists various UPS statuses, their corresponding alarms, and mute options.

UPS Status	INDICATING	ALARM	MUTE
Bypass Mode		Rings every 2mins	OK
Battery Mode		Rings every 4 seconds
Fault	Continued Ringing	Rings twice every second	NO
Warning		Rings twice every second
Overload		Rings twice every second
Low Battery Capacity		Rings twice every second
Battery Unconnected		Rings twice every second
Battery Overcharged		Rings twice every second
EPO Start		Rings twice every second
Fan Fault / Overheat		Rings twice every second
Charger Fault		Rings twice every second
Input Fuse Breaks		Rings twice every second
Overload happens 3 times in 30mins		Rings twice every second
Input Off Phase or Phase Loss		Rings twice every second
Bus Voltage Fail To Launch Through Software		Ringing at the time	OK
Bus Voltage Too High		Ringing at the time	OK
Bus Voltage Too Low		Ringing at the time	OK
Bus Voltage Unbalance		Ringing at the time	OK
Inverter Fail To Launch Through Software		Ringing at the time	OK
Inverter Voltage Too High		Ringing at the time	OK
Inverter Voltage Too Low		Ringing at the time	OK
Inverter Output Short Circuit		Ringing at the time	OK
Negative Work Fault		Ringing at the time	OK
Battery SCR Short Circuit		Ringing at the time	OK
Overheat		Ringing at the time	OK
CPU Communication Fail		Ringing at the time	OK
Charger Output Short Circuit		Ringing at the time	OK
Overload		Ringing at the time	OK

3-4. Main unit operation

This section details how to operate the UPS unit.

1. Start Under Main Supply Mode

Confirm the system wiring and long-run machine battery cabinet voltage are correctly connected, then switch the battery cabinet breaker to <ON> (this operation only adapts to long-run machines).
Switch the main supply breaker to <ON>. The inner power of the UPS will auto-start, the fan will rotate, and the UPS will enter the initialize mode. After seconds, the UPS will run in bypass mode and output.

Remarks: When the UPS is running under bypass mode and supplying power to the load through bypass, the load is not completely protected by the UPS. Only when the UPS is started and running under the main supply mode can the load be completely protected. To better protect your facility, please start your UPS.

Press <ON> for over 1 second; upon hearing a ringing, the UPS will start under main supply mode.
If there is any abnormal main supply input after the UPS starts, the UPS will enter battery mode directly to avoid interruption of power supply for the load.

Remark: The UPS will shut down when the battery runs out of power in battery mode. Once the main supply recovers, the UPS will restart and switch to the main supply mode.

2. Start Under Battery Mode

Please ensure the battery cabinet breaker is set to <ON>.
Press and hold the <ON> button for more than 1 second to turn on the UPS; you will hear the buzzer.
Seconds later, the UPS will access battery mode.

3. Connecting Devices

After the UPS has started, please connect your device to the UPS:

First, start the UPS, then start your devices. The LCD panel will show the current load.
Before connecting any inductive load like a printer, please calculate the surge current. Ensure the UPS capacity is sufficient to support all loads, as such inductive loads have high power dissipation.
When the UPS is overloaded, the buzzer will ring twice per second. Please reduce the load and maintain an 80% load rate or below to keep the system running safely.
When the UPS is overloaded, please remove some load and keep the total load under 80% load rate to avoid overload and maintain system safety.
Under main supply mode, if overload occurs for a certain time (refer to specifications), the UPS will switch to bypass mode. Once the overload is cleared, the UPS will switch back to the main supply mode. If overload occurs three times within half an hour, the UPS will be locked under bypass mode; you will need to press the start button to restart the UPS to access the main supply mode. If overload occurs for a certain time under main supply mode (refer to specifications), the UPS will display a fault.

4. Battery charging

When the UPS is connected to the main supply, the battery will be charged automatically in both main supply mode and bypass mode. The battery will maintain a floating charge once filled.
It is suggested to charge the battery for 10 hours before use, or the backup time may be shorter than expected.
The charging current can be adjusted through the LCD screen or software. The setting range for long-run machines is 0.5A-6A, and for standard machines, it is 0.5A-2A. Please set the correct charging current according to your battery specification.

5. Battery Mode Operation

Under battery mode, the buzzer rings differently according to the remaining battery capacity: when the remaining battery capacity is over 25%, the buzzer rings once every 4 seconds; when the capacity drops to the warning level, the buzzer rings once per second, indicating the UPS battery is low and will shut down automatically. In the latter situation, users can remove some inessential loads to extend backup time. If there are no inessential loads to be removed, please save data and shut down major loads quickly, or you may face data loss or load-off risks.
Under battery mode, users can press <Mute> to silence the ringing noise.
Long-run machine backup time depends on the external battery capacity.
Battery backup time varies according to different environments, temperatures, and different loads.
When the backup time is set to 16.5 hours (Default), after the UPS has been supplying power from the battery for 16.5 hours, the UPS will shut down automatically to protect the battery. The battery protection can be set to start or shut down via the LCD panel (Operation refers to <3-7 LCD setting>).

6. Battery Self-checking

Under the main supply/CVCF mode, press the <Test> button for over 1 second to enter the battery self-checking status.
Users can also use the battery monitor software to set battery self-checking execution.

7. Shutdown in mains mode

Press the <OFF> button for over 1 second; the buzzer will ring once, then the inverter will shut down, and the UPS will switch to bypass mode.

Remark 1: If the UPS is set to output through bypass, even if the UPS inverter shuts down, the main supply will output through bypass directly.

Remark 2: If the UPS is supplied by bypass when shut down, once the main supply powers off, the load connected would also risk of power off.

Under bypass mode, the UPS output voltage remains on. Only if the input breaker shuts down, the LED light will turn off a second later, and the UPS is completely shut down.

8. Shut down under battery mode

Press the <OFF> button for over 1 second under battery mode; the buzzer will ring once, and the UPS will shut down all power input and output.

9. Mute buzzer

Press the <Mute> button for over 1 second to access mute mode (refer to 3-3). Press <Mute> again to cancel.
Alarm ringing cannot be muted.

10. Operation under alarm ringing

When the <Fault> LED indicator light flickers and the buzzer rings, it means a fault has occurred while the UPS is running. Users can find the fault code on the LCD panel and solve the problem according to chapter 4 detailed operation instructions.
The alarm cannot be shut down before the fault is cleared in some cases (Please refer to 3-3 for more details).

11. Operation under fault mode

When the <Fault> LED indicator light flickers and the buzzer rings, it indicates a serious fault has occurred. Users can find the fault code and solve the problem according to chapter 4 detailed operation instructions.
When a fault occurs, please check the load, wiring, ventilation, main supply, and battery carefully. Please do not attempt to restart the UPS before the problem is solved. If you cannot find the reason, please contact after-sales service or professional maintenance staff.
In case of any emergency, please break the main supply, external battery, and output to avoid any extended risk.

3-5. LCD Display abbreviation

This table lists abbreviations displayed on the LCD screen and their meanings.

Abb.	Display	Meaning
ENA	ENA	Enable
DIS	d15	Disable
ATO	860	Auto
BAT	68E	Battery
NCF	NCF	Normal Mode (not CVCF mode)
CF	CF	CVCF Mode
SUB	506	Subtract
ADD	Add	Add
ON	00	On
OFF	OFF	Off
FBD	Fbd	Not allowed
OPN	OPN	Allowed
RES	TES	Reserve

3-6. LCD Setting

This section describes the parameters that can be set for the UPS via the LCD screen.

Parameter 1: Set item number, please set according to the diagram.

Parameter 2 & 3: Set value for each item.

Remark: Please press "UP" or "DOWN" to select item or value.

Item #	Description	Bypass	AC	CVCF	Battery Test
01	Input Voltage	Y
02	Output Frequency	Y
03	Bypass Voltage Range	Y
04	Bypass Frequency Range	Y
05	Retain
06	Retain
07	Retain
08	Bypass Mode Setting	Y	Y
09	Battery Backup Time Setting	Y	Y
10	Retain
11	Retain
12	Retain
13	Battery Voltage Calibration	Y	Y	Y	Y
14	Charger voltage calibration (for single-phase models only)	Y	Y	Y	Y
15	Inverter Voltage Calibration	Y	Y	Y	Y
16	Float Charging Voltage Calibration (unavailable for now)	Y	Y	Y	Y
17	Constant Voltage Calibration (unavailable for now)	Y	Y	Y	Y
18	Charging Current Setting	Y	Y	Y	Y
19	Battery Capacity & Battery Unit Number Setting	Y	Y	Y	Y
20	Discharging Time Calibration	Y	Y	Y	Y

Remark: Y means item can be set under related mode.

Detailed LCD Setting Explanations:

01: Output voltage

Panel Display: Shows output voltage (e.g., 220 Vac).

Setup: Parameter 3 allows selection of output voltage: 208V, 220V, 230V, or 240V (default).

02: Output frequency

Panel Display: Shows output frequency (e.g., 60.0 Hz).

Setup: Parameter 2 sets the output frequency (50Hz, 60Hz, or ATO). ATO automatically adjusts frequency based on input. Parameter 3 sets the frequency mode (CVCF or NCF).

03: Bypass voltage range

Panel Display: Shows bypass voltage range (e.g., 176-264 Vac).

Setup: Parameter 2 sets the minimum bypass voltage (110-209V, default 110V). Parameter 3 sets the maximum bypass voltage (231-276V, default 264V).

04: Bypass frequency range

Panel Display: Shows bypass frequency range (e.g., 46.8-53.8 Hz).

Setup: Parameter 2 sets the minimum bypass frequency (46-49Hz for 50Hz system, 56-59Hz for 60Hz system). Parameter 3 sets the maximum bypass frequency (51-54Hz for 50Hz system, 61-64Hz for 60Hz system).

08: Bypass mode setup

Panel Display: Shows bypass mode status (e.g., OPN ENA).

Setup: Parameter 2: OPN (allow bypass mode) or FBD (do not allow bypass mode). Parameter 3 (valid for OPN): ENA (start bypass function) or DIS (stop bypass function, allows automatic bypass but not manual).

09: Battery back-up time setup

Panel Display: Shows backup time (e.g., 990).

Setup: Parameter 3 sets the maximum battery discharge time (000-999 mins, default 990 mins) or DIS (stop battery discharge protection).

13: Battery voltage calibration

Panel Display: Shows battery voltage calibration status (e.g., Add 01.8 Vdc).

Setup: Parameter 2: ADD or SUB. Parameter 3: voltage adjustment range (0V-5.7V, default 0V).

14: Charger voltage calibration

Panel Display: Shows charger voltage calibration status (e.g., Add 02.6).

Setup: Parameter 2: ADD or SUB. Parameter 3: voltage adjustment range (0V-6V, default 0V). Note: only for single-phase series.

15: Inverter voltage calibration

Panel Display: Shows inverter voltage calibration status (e.g., Add 01.6 Vac).

Setup: Parameter 2: ADD or SUB. Parameter 3: voltage adjustment range (0V-6.4V, default 0V).

3-7. Running mode / status description

This section describes the different running modes and status indicators.

Running mode / state	Instruction	LCD display content
Bypass mode instruction	When input voltage is not in the allowable range or power off, UPS will provide output by battery, and sounding in every 4 seconds.	INPUT: 229 Vac OUTPUT: 229 Vac Hz: 50.0 Hz Status: BYPASS
AC mode instruction	When input voltage is in the allowable range, UPS can supply persistent AC power output. UPS is in AC mode, also charging the battery.	INPUT: 228 Vac OUTPUT: 220 Vac Hz: 50.0 Hz Status: AC Mode
CVCF mode instruction	When input frequency is between 46Hz~64Hz, UPS output frequency will be stable at 50Hz or 60Hz depending on the setting. In this mode, UPS is still charging the battery.	INPUT: 220 Vac OUTPUT: 220 Vac Hz: 62.3 50.0 Hz Status: CF
Battery self-inspection instruction	When UPS is in AC mode or CVCF mode, press "TEST" button for more than 1 second. UPS will turn into battery self-inspection, and the buzzer will sound once. The connect cable will blink between the I/P and inverter icons to prompt the user. This operation is to test the state of the battery.	INPUT: 239 V OUTPUT: 220 V Hz: 50.0 Hz Status: Battery Test
Error state instruction	When the UPS fails, the failure information will be displayed on the LCD panel.	INPUT: 224 Vac OUTPUT: 53.400.0 Hz Status: OVER LOAD

3-8. Error Code

This table lists common fault events, their corresponding fault codes, and status indicators.

Fault event	Fault code	Image	Fault event	Fault code	Image
Bus soft start fail	01	NO	Negative work breakdown	1A	NO
Bus voltage too high	02	NO	Battery SCR short circuit	21	NO
Bus voltage too low	03	NO	Inverter relay short circuit	24	NO
Bus voltage unbalance	04	NO	Charger output short circuit	2A	NO
Inverter soft start fail	11	NO	Overheat	41	NO
Inverter voltage too high	12	NO	CPU communication fault	42	NO
Inverter voltage too low	13	NO	Overload	43	OVER LOAD
Inverter output short circuit	14	SHORT

3-9. Warning instructions

This table details warning messages, their associated indicators, alarm sounds, and alarm codes.

Warning content	Mark (flicker)	Alarm sound	Alarm code
Battery unconnected	BATT.FAULT	One sound per second	01
Three phase input missed or lacked		One sound per second	02
Three Phase Input Dislocation		One sound per second	04
Battery overcharge		One sound per second	07
Battery voltage too low	LOW BATT.	One sound per second	08
Overload	OVER LOAD	Two sounds per second	09
EPO start		One sound per second	0b
Fan fault / overheat		One sound per second	0d
Charger fault		One sound per second	0E
Three times overload in 30 minutes		One sound per second	33
Three phase input extreme unbalance		One sound per second	3C
I/P fuse disconnect		One sound per second	3D

4. Troubleshooting

When the UPS system is working abnormally, please try to solve problems according to the following table.

Question situation	Possible reason	Solve ways
Main power is normal, but without any flicker indicator light, no alarm voice. LCD screen displays the mark [Warning] and [EPO Start] with one sound per second.	AC input power is loose or has a bad connection. EPO function has been started.	Check whether the input cable is loose. Please shut off the EPO wire to stop the EPO function.
LCD screen displays the mark [Warning] [BATT.FAULT] with one sound per second.	Extend battery connect way is wrong.	Check whether all of the battery connect ways are correct.
LCD screen displays the mark [Warning] [OVER LOAD] with two sounds per second.	UPS overload.	Remove the parts of ultra-rated load.
LCD screen displays the mark [Warning] [OVER LOAD] and currently using the bypass supply power for equipment by AC directly. Fault code shows 43 and the mark [OVER LOAD] is flickering, buzzer rings all the time.	UPS overload, and UPS be locked to bypass mode, supply power by AC directly.	Remove the parts of ultra-rated load, and restart UPS.
Fault code shows 14 and the mark [SHORT] is flickering, and buzzer rings all the time.	UPS overload time is too long to enter the fault status, and shutdown automatically. Output is in short circuit.	Check the output wiring, confirm whether the equipment is in short circuit.
LCD screen displays other fault codes, and buzzer rings all the time.	UPS inner part's fault.	Please contact your distributor.
Battery backup time is shorter than the specification.	Maybe battery not fully charged. Battery's fault.	Please charge at least 7 hours, then check the battery power. If still low, please contact your distributor.
Fan is stuck or unable to rotate; or UPS overheat.		Check the fan and contact your distributor.

Note: The UPS system uses dangerous voltage; only qualified maintainers are able to repair it. Electrocution can occur. Even after shutting off the main power, the UPS system's inner module is still connected to the battery.

When performing any service or maintenance, shut off the battery first and confirm that there is no dangerous voltage at both ends of the bus capacitor.

Only personnel fully familiar with the battery and equipped with protective measures can perform or supervise battery replacement. Unauthorized persons must stay away from it. Electrocution can occur. Battery wiring and AC input are not isolated. Dangerous voltage may exist between the battery terminal and grounding.

Batteries can cause electric shock and generate large short-circuit currents. Before maintenance, please remove watches, rings, and other metal materials, and use tools with insulated handles and shanks during maintenance.

When replacing the battery, please install the same quantity and specification. Do not throw batteries into fire, as this may cause an explosion. Obsolete batteries should be disposed of according to local regulations. Do not disassemble or damage the battery; if the battery electrolyte leaks, it can cause harm to skin and eyes, and may even be toxic.

Only change the fuse with the same type and amperage to avoid fire. Laypeople cannot disassemble the UPS system.

5. Storage, maintenance and warranty

5-1. Storage

Before storing this product, please charge it for 7 hours. It should be stored upright in a dry place. During storage, please carry out charging maintenance as per the following schedule:

Storage temperature	Charging interval	Charging time
-25°C to 40°C	In every three months	1 hour to 2 hours
40°C to 45°C	In every two months	1 hour to 2 hours

5-2. Maintenance

When the UPS system is abnormal, please follow the instructions below. The UPS system inner module still connects with battery, so please be careful.

When performing maintenance, shut off the battery at first, and confirm that there is no dangerous voltage in the both ends of bus capacitor.

Only personnel fully familiar with the battery and equipped with protective measures can perform or supervise the replacement of the battery. Unauthorized persons must stay away from it.

Electrocution can occur. Battery wiring and AC input are not isolated. Dangerous voltage may exist between the battery terminal and grounding.