INVT DBU100H Series User manual

DBU100H
Dynamic Braking Unit

Operational manual for dynamic braking unit
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Content
1 Safety Precautions .............................................................................................................. 1
1.1 Safety definition........................................................................................................1
1.2 Warning symbols......................................................................................................1
1.3 Safety guidelines......................................................................................................1
2 Inspection............................................................................................................................ 4
2.1 Unpacking inspection ...............................................................................................4
2.2 Environment.............................................................................................................4
2.3 Installation confirmation............................................................................................5
3 Installation Guidelines.......................................................................................................... 6
3.1 Installation environment............................................................................................6
3.2 Installation direction..................................................................................................7
3.3 Installation mode ......................................................................................................8
3.4 External dimensions.................................................................................................8
4 Product name, model definition and usage........................................................................ 10
5 Installation of the dynamic braking unit and parameters setting ..........................................11
5.1 Wiring diagram.......................................................................................................11
5.2 Terminals of the main circuit ...................................................................................11
5.3 Main control terminal of the braking unit .................................................................12
5.4 Adjustment .............................................................................................................12
5.5 Voltage selection setting.........................................................................................12
6 Parallel running.................................................................................................................. 14
7 Fault analysis and the solution........................................................................................... 15
8 Selection ........................................................................................................................... 16
8.1 Guidelines of braking voltage selection...................................................................16
8.2 Calculation of the braking resistor and the braking current......................................16
8.3 Calculation and selection of the braking resistor.....................................................16
8.4 Usage standard and selection reference of the input voltage degree for adaptation
DBU (220V)..................................................................................................................17
8.5 Usage standard and selection reference of the input voltage degree for adaptation
DBU (380V)..................................................................................................................17
8.6 Usage standard and selection reference of the input voltage degree for adaptation
DBU (660V)..................................................................................................................18
8.7 Selection of the braking resistors:...........................................................................19
9 Maintenance and hardware diagnostics............................................................................. 21
9.1 Maintenance intervals.............................................................................................21
9.2 Cooling fan.............................................................................................................24
9.3 Power cable ...........................................................................................................24

Operational manual for dynamic braking unit
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1 Safety Precautions
1.1 Safety definition
Danger:
Serious physical injury or even death may occur if not follow
relevant requirements
Warning:
Physical injury or damage to the devices may occur if not
follow relevant requirements
Note:
Physical hurt may occur if not follow relevant requirements
Qualified
electricians:
People working on the device should take part in professional
electrical and safety training, receive the certification and be
familiar with all steps and requirements of installing,
commissioning, operating and maintaining the device to avoid
any emergency.
1.2 Warning symbols
Warnings caution you about conditions which can result in serious injury or death and/or
damage to the equipment, and advice on how to avoid the danger. Following warning symbols
are used in this manual:
Symbols
Name
Instruction
Abbreviation
Danger
Danger
Serious physical injury or even
death may occur if not follow the
relative requirements
Warning
Warning
Physical injury or damage to the
devices may occur if not follow the
relative requirements
Note
Note
Physical hurt may occur if not
follow the relative requirements
Note
1.3 Safety guidelines
Only qualified electricians are allowed to operate.
Do not carry out any wiring and inspection or changing components
when the power supply is applied.
Do not refit unauthorizedly; otherwise fire, electric shock or other injury
may occur.
1.3.1 Delivery and installation
Please install the braking units and braking resistors on fire-retardant
material and keep them away from combustible materials.

Operational manual for dynamic braking unit
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Do not use any braking unit and braking resistor with loss and damaged
components.
High voltage DC current is present after connecting braking unit. Do not
touch the braking unit, internal component and PCB with hands;
otherwise the electric shock may occur.
Note:
Select appropriate moving and installing tools to ensure a safe and normal running of the
dynamic braking unit and avoid physical injury or death. For physical safety, the erector
should take some mechanical protective measurements, such as wearing exposure
shoes and working uniforms.
Ensure to avoid physical shock or vibration during delivery and installation.
Do not hold its front cover only. The cover may fall off.
Install away from children and other public places.
The dynamic braking unit cannot meet the requirements of low voltage protection in
IEC61800-5-1 if the sea level of installation site is above 2000m.
Please use the DBU on appropriate condition (See chapter Installation Environment).
Don't allow screws, cables and other conductive items to fall inside the DBU.
Fasten the screws while wiring, otherwise the loose wiring may cause fire or current
leakage.
1.3.2 Commission and running
Disconnect all power supplies applied before the terminal wiring and
wait.
Only qualified electricians are allowed to operate on the dynamic
braking unit.
Check the wiring before the running.
Do not touch the terminal of the control board during powering on.
Check the master details and voltage degree before running.
Do adjust and check the dynamic braking unit only after the POWER
LED is totally off and the voltage between (+) and (-) is 0.
Do not touch any internal components when the dynamic braking
unit is working.
The braking unit is the accessory device of the inverter. Please use it
with caution because the damage to the inverter and the dynamic
braking unit may occur.
Our company reserves the right to take the responsibility for the

Operational manual for dynamic braking unit
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DBU (no matter it is relative to the braking unit or not). Please install
the safety fuses special for the semiconductors.
Note:
Do not switch on or off the input power supply of the dynamic braking unit frequently.
Ensure correct setting of the braking units and resistors.
Do not carry out any voltage test on DBU; otherwise damage to the main circuit of the
semiconductor components may occur.
If multiple DBU are installed in a cabiner for paralle application, please install a fan or
other cooling devices.
DBU needs temperature and other protections. It is necessary to isolate the device if fault
occurs to the device and cause heating. If not isolate, our company reserves the right to
the accident.
1.3.3 Maintenance and replacement of components
Only qualified electricians are allowed to perform the maintenance,
inspection, and components replacement of the DBU.
Disconnect all power supplies to the DBU before the terminal wiring.
Wait for at least the time designated on the DBU after disconnection.
Take measures to avoid screws, cables and other conductive
matters to fall into the DBU during maintenance and component
replacement.
Note:
Please select proper torque to tighten screws.
Keep the dynamic braking unit, parts and components away from combustible materials
during maintenance and component replacement.
Do not carry out any isolation and voltage test on the dynamic braking unit and do not
measure the control circuit of the dynamic braking unit by megameter.
Carry out a sound anti-electrostatic protection to the dynamic braking unit and its internal
components during maintenance and component replacement.
1.3.4 Scrap treatment
There are heavy metals in the dynamic braking unit. Deal with it as
industrial effluent.
When the life cycle ends, the product should enter the recycling system.
Dispose of it separately at an appropriate collection point instead of
placing it in the normal waste stream.

Operational manual for dynamic braking unit
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2 Inspection
2.1 Unpacking inspection
Check as followings after receiving products:
1. Check that there are no damage and humidification to the package. If not, please
contact with local agents or INVT offices.
2. Check the information on the type designation label on the outside of the package
to verify that the drive is of the correct type. If not, please contact with local dealers or
INVT offices.
3. Check that there are no signs of water in the package and no signs of damage or
breach to the DBU. If not, please contact with local dealers or INVT offices.
4. Check the information on the type designation label on the outside of the package
to verify that the name plate is of the correct type. If not, please contact with local
dealers or INVT offices.
2.2 Environment
Check as followings before the actual installation and usage:
1. Check that the ambient temperature of the DBU is below 40℃. If exceeds, derate
3% for every additional 1℃. Additionally, the DBU can not be used if the ambient
temperature is above 50℃.
Note: for the cabinet DBU, the ambient temperature means the air temperature inside
the cabinet.
2. Check that the ambient temperature of the DBU in actual usage is above -10℃. If
not, add heating facilities.
Note: for the cabinet DBU, the ambient temperature means the air temperature inside
the cabinet.
3. Check that the altitude of the actual usage site is below 1000m. If exceeds,
derate1% for every additional 100m.
4. Check that the humidity of the actual usage site is below 90% and condensation is
not allowed. If not, add additional protection the DBU.
5. Check that the actual usage site is away from direct sunlight and foreign objects
can not enter the DBU. If not, add additional protective measures.
6. Check that there is no conductive dust or flammable gas in the actual usage site. If
not, add additional protection to the DBU.

Operational manual for dynamic braking unit
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2.3 Installation confirmation
Check as followings after the installation:
1. Check that the load range of the input and output cables meet the need of actual
load.
2. Check that the accessories of the DBU are correctly and properly installed. The
installation cables should meet the needs of every component (including reactors,
input filters, output reactors, output filters, DC reactors, braking units and braking
resistors).
3. Check that the DBU is installed on non-flammable materials and the calorific
accessories (reactors and brake resistors) are away from flammable materials.
4. Check that all control cables and power cables are run separately and the routation
complies with EMC requirement.
5. Check that all grounding systems are properly grounded according to the
requirements of the DBU.
6. Check that the free space during installation is sufficient according to the
instructions in user’s manual.
7. Check that the external connection terminals are tightly fastened and the torque is
appropriate.
8. Check that there are no screws, cables and other conductive items left in the DBU.
If not, get them out.

Operational manual for dynamic braking unit
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3 Installation Guidelines
Only qualified electricians are allowed to carry out what described in this
chapter. Please operate as the instructions in Safety Precautions.
Ignoring these may cause physical injury or death or damage to the
devices.
Ensure the power supply of the dynamic braking unit is disconnected
during the operation. Wait for at least the time designated until the
POWER indicator is off after the disconnection if the power supply is
applied. It is recommended to use the multimeter to monitor that the DC
bus voltage of the drive is under 36V.
The installation and design of the dynamic braking unit should be
complied with the requirement of the local laws and regulations in the
installation site. If the installation infringes the requirement, our company
will exempt from any responsibility. Additionally, if users do not comply
with the suggestion, some damage beyond the assured maintenance
range may occur.
3.1 Installation environment
The installation environment is the safeguard for a full performance and long-term stable
functions of the DBU. Check the installation environment as followings:
Environment
Conditions
Installation site
Indoor
Environment
temperature
-10~+50℃
If the ambient temperature of the dynamic braking unit is above
40℃, derate 3% for every additional 1℃.
It is not recommended to use the dynamic braking unit if the
ambient temperature is above 50℃.
In order to improve the reliability of the device, do not use the
dynamic braking unit if the ambient temperature changes
frequently.
Please provide cooling fan or air conditioner to control the
internal ambient temperature below the required one if the
dynamic braking unit is used in a close space such as in the
control cabinet.

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Environment
Conditions
When the temperature is too low, if the dynamic braking unit
needs to restart to run after a long stop, it is necessary to
provide an external heating device to increase the internal
temperature, otherwise damage to the devices may occur.
Humidity
RH≤90%
No condensation is allowed.
The maximum relative humility should be equal to or less than
60% in corrosive air.
Storage
temperature
-30~+60℃
Running
environment
condition
The installation site of the DBU should:
keep away from the electromagnetic radiation source;
keep away from contaminative air, such as corrosive gas, oil
mist and flammable gas;
ensure foreign objects, such as metal power, dust, oil, water
can not enter into the DBU(do not install the DBU on the
flammable materials such as wood);
keep away from direct sunlight, oil mist, steam and vibration
environment.
Altitude
Below 1000m
If the sea level is above 1000m, please derate 1% for every
additional 100m.
Vibration
≤5.8m/s2(0.6g)
Installation
direction
The DBU should be installed on an upright position to ensure
sufficient cooling effect.
Note:
DBU100H series should be installed in a clean and ventilated environment according to
enclosure classification.
Cooling air must be clean, free from corrosive materials and electrically conductive
dust.
3.2 Installation direction
DBU100H must be installed in an upright position.

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3.3 Installation mode
DBU100H can be installed in wall (for all frame sizes)
3.4 External dimensions
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7
H
L1 L W
Figure 1 Dimensions of 60ADBU
Figure 2 Dimensions of 110A-220A DBU
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