TECO MV510 Series User manual

Version No.: V1.0
MV510 series Medium-Voltage Inverter
Maintenance manual
Taian Technology (Wuxi) Co., Ltd.
(TECO Group)

MV510 series high-voltage inverter maintenance manual
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Chapter I Safety Precautions
1.1 Please read this manual carefully prior to use of the product.
1.2 Be sure to follow instructions in this manual during use of the medium-voltage
equipment with medium-voltage AC power inside that may lead to personal
injury.
1.3 Please abide by instructions for various models during transportation or
operation.Otherwise, personal injury may be caused.
1.4 Protect the VFD or its outer package from seawater or rainwater during
transportation or storage.Otherwise, seawater or rainwater may enter the VFD
and lead to damage.

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1.5 Check the marked weight of this VFD and select a proper crane for suspension
and movement of this VFD. Please follow the operating structions to avoid
personal injury.
1.6 Do not incline this VFD forward or backward by over 10 degrees during
installation. Otherwise, the VFD may slide down and lead to injury.
1.7 Keep balance under instruction of the work supervisor during transportation
with roller.Otherwise, the VFD may slide down and lead to injury.
1.8 The user is not allowed to modify or move this VFD without permission.
Except professionals, others modifying or moving the VFD may lead to electric
shock, injury or fault.
Incline≤10°

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1.9 Ensure the VFD is earthed. Otherwise, the decreased insulating capacity may
lead to electric leakage or shock.
1.10 The system parameters must be correctly set by the qualified personnel, as the
system may be overloaded and damaged if the wrong parameters are set.
1.11 Only the qualified and trained personnel with proper safety measures are
allowed to operate this VFD.Electric shock, injury or fault may be caused if it
is operated by any person not qualified or trained.
1.12 It is prohibited to switch off the main power and control power supply during
operation of the drive and normal operation of the motor.Otherwise, the drive
may break down.
Qualification
Motor

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1.13 Do not open the cabinet door when the VFD is charged or has residual
voltage.
1.14 In case of fire, please turn the circuit breaker of medium-voltage power and
control power to the OFF position immediately, and do not attempt to use the
VFD.Otherwise, fire may be caused.
1.15 Do not block the air vents in the front, on the top and by the side of the
equipment.Otherwise, internal temperature of the equipment may increase and
lead to fault.

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1.16 Please read the warning sign on the drive prior to operation.Otherwise,
electric shock or injury may be caused.
1.17 Do not stop air conditioner in the VFD room during operation.Otherwise, the
room temperature may raise and lead to failure of the drive.
1.18 Turn the circuit breaker of medium-voltage power and control power to the
OFF position prior to cleaning or inspection.
1.19 Do not touch the rotating cooling fan, or injury may be caused.

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1.20 Do not take out any module rapidly from the rack, or apply excessive force to
any side of the module after it is pulled out.Otherwise, the module may fall
from the rack, leading to deformation, injury or failure.
1.21 Please contact us timely in case of faults of operation. We will provide remote
assistance or assign maintenance engineers to your site for solving the
problem.
1.22 Please use the replacement parts specified by us.Otherwise, burning, electric
shock, injury or failure may be caused.
Note: Please strictly follow the above safety specifications for operation.
Otherwise, VFD damage and personal injury may be caused.
Specify parts

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Chapter II Rules of System Operation
MV510 series medium voltage VFD generally consists of various cabinets as
listed below (from left to right):
●Start-up cabinet
●Transformer cabinet
●Power cell cabinet
●Control cabinet
Diagram 1-1
Note:
This diagram is only the external dimensions of the company's product selection
MV510-C33/180-S00 (3.3kV 1000kVA). Diagram 1-1 includes the startup cabinet, which is
a direct power-on solution. Due to the different capacity of the inverter, the cabinet size will
change accordingly. Please refer to the random size for detailed dimensions. Equipped with
outline drawing.
2.1 Regular inspection
Electronic equipment cannot be used permanently, even in normal working
conditions, if it exceeds the service life, it will produce characteristic changes or
malfunction. In order to prevent such failures, preventive maintenance such as
daily inspections, periodic inspections, and replacement of parts must be
Start-up cabinet
Transformer cabinet
Power cell cabinet
Control cabinet

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performed.
The medium-voltage inverter is composed of IGBT (Insulated Gate Bipolar
Transistor), semiconductor components such as IC, electronic components such as
capacitors and resistors, and various components such as fans and relays. If all of
these components do not function properly, you will not be able to perform the
functions your product should have.
Please follow the checklists in this section to perform regular inspections. It is
recommended to check every 1 year after the equipment is installed.
(Note) When installing the medium-voltage inverter in the following
environment, shorten the periodic inspection cycle as compared with the normal
case.
·High temperature environment
·Frequent start and stop environment
·Frequent power on and off environment
·Environment with AC power or load fluctuations
·An environment with excessive vibration or shock
·Environment with dust, metal dust, salt, sulfuric acid and chlorine
·Storage in a poor environment
Daily inspection
The daily inspection of our medium-voltage inverter is shown in Table 2.1. In
order to avoid malfunction of the medium-voltage inverter and product damage,
please confirm the following items every day. Please copy the checklist for use.
After each confirmation, put a “confirmation” stamp on the check box.
Table 2.1 Daily Checklist (Overall)
Check item
Inspection matters
Check bar
Surroundings
Is the ambient temperature normal?(0-40℃)
Is the humidity normal?(<90%, No
condensation)
Are there any harmful gases?
Are dust, oil mist, etc. attached?
Overall device
Are there any abnormal sounds and
vibrations?
Voltage
Whether the main circuit voltage and the
control voltage are normal (measured by the
meter or the like on the power supply unit
side.)
Transformer
Is there any smell or abnormal sound?
Cooling system
Does the cooling fan have abnormal
vibration and abnormal sound?
Is the door filter dirty?
Indicator light
Is the bulb broken?

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Meter
Is the indication value normal?
HMI
The touch screen displays whether it is clear
and whether characters are missing？
Whether there is abnormal sound or
abnormal vibration？
Is the bolt loose?
With or without deformation damage?
Whether there is discoloration caused by
overheating?
Whether there is adhesion to dust or dirt?
Periodic inspection
The periodic inspection of our medium-voltage inverter is shown in Table 2.2.
Under normal circumstances, it is recommended to conduct regular inspections
every 1 to 2 years, but please determine the actual inspection frequency in
combination with the actual use and working environment of each inverter.
Regular inspections help prevent medium-voltage inverters from functioning and
product damage. Please copy the checklist for use. After each confirmation, put a
“confirmation” stamp on the check box.
Regular maintenance inspection general steps
(1) Cut off all power supplies of the medium-voltage inverter: cut off the main
power and control power of the medium-voltage inverter,UPS power off;
(2)Wait for more than 15 minutes, confirm the implementation of item (1),
and confirm the discharge of the power cell;
(3)Confirm that the switch has been reliably disconnected and grounded;
(4)Open the medium-voltage inverter cabinet door and check the inspection
item list item by item (refer to the periodic inspection table);
(5)Confirm maintenance inspection work;
(6)Confirm that the maintenance work is completed;
(7)Confirm that the power supply is connected correctly and reliably;
(8)Confirm that the tools are not in the cabinet;
(9)Close and lock the door, re-power on, and confirm the maintenance;
(10)Fill in the maintenance inspection report and file it.
Regular inspection
Danger: To prevent electric shock
Do not perform inspections while the main circuit power supply and control
power are on.
Otherwise there is a danger of electric shock.
Please turn off the power of all devices before checking. Even if the main
circuit power supply is cut off, there is residual voltage in the capacitor inside the
medium voltage inverter. Wait for more than 15 minutes after turning off the
power.

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Table 2.2 Periodic inspection table
Check parts
Check item
Inspection matters
Inspection
methods and
criteria
Check bar
Transformer
part
Power cell
Overall
Check with megger
(between main circuit
terminal and ground
terminal)
Visual/Instrument
inspection: no
damage, no
pollution, no
abnormalities.
Are screws, bolts and
connectors loose?
Is there any damage,
deformation or
discoloration of parts
caused by overheating or
aging?
Are dirt, garbage, and
dust attached?
Wire
Is the wire cladding
damaged or aged?
Transformer
Is the coil part and
insulation paper
damaged?
Is there any dust or
foreign matter on the coil
part?
Power cell
Does the capacitor leak
liquid?
Is the safety valve of the
capacitor extended?
Does the capacitor
expand?
Are the screws and bolts
loose?
Is the main circuit fuse
and the control fuse on
the board normal?
Is there any dirt or dust
on the heatsink?
Surge
suppressor
Is there any appearance
of dirt, loose parts of the
terminals and loose
mounting bolts?
Control section
Loop
Is there any abnormality
between the protection
circuit and the display
Visual inspection:
no damage, no
pollution, no

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circuit?
abnormalities.
Relay
Is there any high
frequency vibration
when moving?
Is the timer's operating
time normal?
Is the contact loose?
Circuit board
Is there any smell or
discoloration?
Is the power supply
normal?
Are the screws and bolts
loose?
Operator
Is the screen displayed
correctly?
Is the operation
department dirty?
Switch
Is the switch action
normal?
Cooling
system
Door filter
Is it dirty or clogged?
Visual inspection:
no damage, no
pollution, no
abnormalities.
Cooling fan
Are there any abnormal
sounds and vibrations?
Is the bearing normal?
Please perform regular inspection as follows.
■Inspection with megohmmeter (insulation resistance measurement)
Insulation resistance measurement on the primary side of the inverter
Please use a 2500V megohmmeter.
The acceptance criteria are 1000 MΩ or more.
Since the grounding is performed with a high resistance detected by the input
voltage, remove the voltage detection resistor and measure it.
The steps are as follows:
Step 1: Disconnect the cable at VFD input(R,S,T), and disconnect the ground
wire of the input voltage detection board.
Step 2: Stay away from the test points.
Step 3: Connect the positive pole of the megohmmeter to VFD input (R phase)
terminal, and the negative pole to ground (the main grounding copper
bar of the inverter).
Step 4: Measure continuously for 1 min and record test result.
Step 5: Repeat Step 3 and Step 4 for S phase and T phase.
After the measurement is completed, recover to connect cables for R,S,T
input cables and the ground wire of input voltage detection board.
Please refer to the picturess shown in Figure 2-3-1.

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(Step1:VFD Input terminal)
(Step1:Voltage detection board)
(Step3: Test point)
Figure 2-3-1
Insulation resistance measurement on the secondary side (motor side) of the
inverter
Please use a 2500V megohmmeter.
The acceptance criteria are 1000MΩ or more.

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Grounding is performed using the high resistance detected by the output
voltage detection and the ground short circuit. Therefore, remove the voltage
connected to the output terminal to detect the high resistance and power cell output
cable and measure.
The steps are as follows:
Step 6: Disconnect the cable at VFD output (U, V, W), and disconnect the
ground wire of the output voltage detection board.
Step 7: Stay away from the test points.
Step 8: Connect the positive pole of the megohmmeter to VFD output (U
phase) terminal, and the negative pole to ground (the main grounding
copper bar of the inverter).
Step 9: Measure continuously for 1 min and record test result.
Step 10: Repeat Step 8 and Step 9 for V phase and W phase.
After the measurement is completed, recover to connect cables for U, V, W
output cables and grounding cable.
Please refer to the pictures shown in Figure 2-3-2.
(Step6:VFD Output terminal)
(Step6:Voltage detection board)

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(Step8:Test point)
Figure 2-3-2
Insulation resistance measurement of surge suppressor
Please use a 2500V megohmmeter.
The acceptance criteria are 1000 MΩ or more.
(Note) Please remove the surge suppressor from the circuit.
The steps are as follows:
Step 11: Disconnect the ground wire of input voltage detection board.
Step 12: Pull out the temperature control lines (PT100) from inside
transformer, and remove the signal lines of the temperature
controller.
Step 13: Disconnect the lightning arrester (R phase) at the input end of the
transformer.
Step 14: Stay away from the test points.
Step 15: Connect the positive pole of the megger to the end of the lightning
arrester (the terminal that was disconnected in step 13), and the
negative pole to ground (the main grounding copper bar of the
inverter).
Step 16: Measure continuously for 1 min and record test result.
Step 17: Repeat Step15 and Step 16 for S phase and T phase.
After the measurement is completed, recover to connect lightning arresters of
R, S and T phases and the ground wire of input voltage detection board.
As shown in Figure 2-3-3

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(Step11:Voltage detection board)
(Step12:Temperature controller)
(Step12:PT100)

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(Step13:Surge suppressor)
(Step15:Test point)
Figure 2-3-3
■Screws, bolts and connectors
If the connection of the main circuit wires is loose, it may cause a fire due to
overheating of the wire connections. When performing regular inspections, be sure
to tighten the screws and bolts again
Tightening torque:
M5 bolts: 2.5 to 3.5 N·m
M6 bolts: 4.4 to 6.6 N·m
M8 bolts: 8.9 to 10.8 N·m
M10 bolts: 18 to 23 N·m
M12 bolts: 31.5 to 39.5 N·m
M16 bolts: 78.5 to 98 N·m
Check the following items:
·Inverter input terminal, Inverter output terminal
·Input voltage detection circuit (option), output voltage detection circuit
·Transformer primary terminal, primary voltage tap terminal
·Transformer secondary terminal

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·Power cell input and output terminals, fiber optic cable connectors
·Power cell screws, bolts and connectors
·Control power input terminal
·Control transformer input terminal and output terminal (optional)
·Power relay input and output terminal for cooling fan
·Various control circuit board screws, bolts and connectors
·Control input terminal, output terminal
■Transformer
Check the following items:
•Check for anything abnormal in the external appearance.
•Check for discoloration indicating burn marks.
•Check for accumulated dirt and dust then remove.
If you find any, clean it away.
•Check for loose bolts in the I/O terminals and tap terminals. Retighten bolts to
the recommended tightening torque.
■Power cell
Check the following items:
•Check for discoloration indicating burn marks.
•Check for leakage from the smoothing capacitor.
•Check for loose bolts in the input terminals (R, S, T) and the output terminals
(T1, T2). Retighten bolts to the recommended tightening torque.
•Check for a loose fiber optic cable connector and re-insert.
•Check for loose screws and bolts inside Power Cells. Retighten screws and bolts
to the recommended tightening torque.
If there are any, retighten them.
•Check the main circuit fuse and control fuse on the board for discoloration and
partial looseness.
•Check for accumulation of dirt and dust on the heatsink.
Remove debris with dried compressed air at: 39.2 ×104 to 58.8 ×104 Pa (4 to
6 kg�cm2).
■Door filter
When the door filter is dirty or clogged, the cooling capacity of the medium-
voltage inverter will be reduced, causing abnormal temperature. Please check the
degree of dirt during daily inspections and decide how often to clean the filter
according to the degree of soiling (make sure the filter is dry when installing the
filter)
■Board
Check the following items:
•Check the board for abnormal odors or discoloration.

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•Check for loose screws or connectors. Retighten screws and connectors to the
recommended tightening torque.
■Cooling fan
Check the following items:
•Check for abnormal vibration and noise.
•Check for loose installation bolts. Retighten bolts to the recommended
tightening torque.
•Check the cooling fan motor bearing. The service life of the bearing is
approximately 40,000 hours.
2.2 Equipment maintenance
In order to use the inverter for a long time and with confidence, it is
recommended to replace the consumables regularly.
In order to maintain the normal operation of the inverter for a long time, it is
necessary to check and replace the parts according to the durability of the
consumables. The approximate standard for periodic inspection varies depending
on the setting environment and usage of the inverter. Please refer to Table 2.1 for
regular maintenance.
•For fuse replacement, refer to “User manual” .
•For replacement of the cooling fan, refer to “User manual”.
•For the replacement of the power cell, refer to “User manual”.
For the replacement of other parts, you need to consult with the company's agent or
sales person who purchased this medium-voltage inverter.
·Cooling fan
·Contactor for cooling fan
·Power cell capacitor
·Rectifier
·IGBT
·Fuse
·PCB board
·UPS
·breaker
·Relay class
Component replacement standard
The standard replacement period for periodic replacement parts is shown in Table
2.4. When replacing, please use our replacement parts that match the model and
version of the medium-voltage inverter used.

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Table 2.4 Standard replacement period
Device name
Standard replacement years
Cooling fan
Run time 40000 hours
Electrolytic capacitor
5 years
A printed circuit board
8 years
Fuse
10 years
Note: This manual is applicable to the MV510 series high-voltage inverter produced
by Taian Technology (Wuxi) Co., Ltd. Thank you for reading again. Please call our
engineering and technical personnel for any questions, we will be happy to help you!