Inovance MDBUN Series User manual

Inovance MDBUN Series Braking Unit User Manual
Page 1 of 24
Preface
Thank you for purchasing Inovance MDBUN series braking unit.
Inovance MDBUN series braking unit applies to the applications where an AC drive or
servo drive (hereinafter referred to as "drive") needs to perform deceleration, positioning
or braking operation. When the drive performs braking, kinetic energy is converted to
electric energy which is fed back to the drive due to the mechanical inertia of the load.
This will cause rising of the DC bus voltage of the drive. Therefore, a braking unit is
required to ensure normal running of the drive. The regenerative energy is consumed by
the braking resistor, preventing the drive from stopping or even being damaged due to
overvoltage protection.
Inovance MDBUN series braking unit provides full protection functions, such as
overcurrent, overheat, and braking unit open-circuit and short-circuit protection. It
supports the setting of parameters including braking start/stop voltage, and braking rate.
Multiple braking units can be deployed in master/slave mode to meet the braking
requirements of high power drive.
Inovance MDBUN braking unit also applies to large-inertia applications that require
sudden stop, for example, such as elevators, textile machines, paper making machines,
centrifuges, wire drawing machines, winding machines, proportional linkage systems, and
crown blocks.
Before performing installation, wiring, operation, maintenance, and inspection, read and
understand this manual thoroughly and follow the instructions. Failure to observe the
instructions may result in personal injury or even death.
Note
The drawings in this manual are sometimes shown without cover or protective guard.
Remember to install the cover or protective guard as specified first, and then perform
operations in accordance with the instructions.
The drawings in this manual are shown for description only and may not match the
product that you have purchased.
The instructions are subject to change due to product upgrade, specification
modification, as well as the efforts to increase the accuracy and convenience of the
manual
Contact the regional agent or customer service center of Inovance if the manual
delivered is lost or damaged.
Contact the customer service center of Inovance if you have problems during the use.

Inovance MDBUN Series Braking Unit User Manual
Chapter 1 Safety Information
In this manual, the notices are graded based on the degree of danger:

DANGER
indicates that failure to comply with the notice will result in severe
personal injury or even death.

WARNING
indicates that failure to comply with the notice will result in personal
injury or property damage.
Read this chapter carefully so that you have a thorough understanding. Installation,
commissioning or maintenance must be performed in conjunction with this chapter.
Inovance will assume no liability or responsibility for any injury or loss caused by improper
operation.
Use Stage
Safety
Grade
Precautions
Before
installation
DANGER
Do not install the device if you find water seepage, component
missing or damage upon unpacking.
Do not install the device if the packing list does not conform to the
product you received.
WARNING
Handle the device with care during transportation to prevent damage
to the device.
Do not use the device if any component is damaged or missing.
Failure to comply will result in personal injury.
Do not touch the components with your hands. Failure to comply will
result in static electricity damage.
During
installation
DANGER
Install the device on incombustible objects such as metal, and keep it
away from combustible materials. Failure to comply may result in a
fire.
Do not loosen the fixed screws of the components, especially the
screws with red mark.
WARNING
Do not drop wire end or screw into the braking unit. Failure to comply
will result in damage to the braking unit.
Install the braking unit in places free of vibration and direct sunlight.
When two braking units are laid in the same cabinet, arrange the
installation positions properly to ensure the cooling effect.
Keep the braking unit close to the drive and ensure that the cable
between them is twisted and does not exceed 5 m.
At wiring
DANGER
Wiring must be performed only by qualified personnel under
instructions described in this manual. Failure to comply may result in
unexpected accidents.
Ensure that the power supply is cut off before wiring. Failure to
comply may result in electric shock.
Ground the device properly. Failure to comply may result in electric
shock.

Inovance MDBUN Series Braking Unit User Manual
Page 3 of 24
WARNING
Connect the (+) and (-) terminals of the DC bus correctly.
Otherwise, the device may be damaged. Pay attention to the
terminal marks.
Ensure that wiring meets the EMC requirements and local safety
standard. Use wire sizes recommended in the manual. Failure to
comply may result in accidents.
Never connect the braking resistor between the DC bus terminals (+)
and (-). Failure to comply may result in a fire.
Before
power-on
WARNING
Check that the voltage class of the power supply is consistent with
the rated voltage class of the braking unit, and that the wiring
between the braking unit and the braking resistor is secure.
Otherwise, the braking unit may be abnormal or damaged.
Do not perform the voltage resistance test on any part of the braking
unit because such test has been done in the factory. Failure to
comply will result in accidents.
DANGER
Cover the braking unit properly before power-on to prevent electric
shock.
All peripheral devices must be connected properly under the
instructions described in this manual. Failure to comply will result in
accidents
After
power-on
DANGER
Do not open the cover of the braking unit cover after power-on.
Failure to comply may result in electric shock.
The braking unit automatically performs safety check on the
external strong-current circuit after power-on. Do not touch the +, -,
P(+), and BR terminals. Failure to comply may result in electric
shock.
Do not touch the externally connected braking resistor. Failure to
comply may result in electric shock.
During
operation
DANGER
Do not touch the fan or the braking resistor to check the temperature.
Failure to comply will result in personal burnt.
Signal detection must be performed only by qualified personnel
during operation. Failure to comply will result in personal injury or
damage to the braking unit.
During
maintenance
DANGER
Repair or maintenance of the braking unit may be performed only by
qualified personnel. Failure to comply will result in personal injury or
damage to the braking unit.
Do not repair or maintain the braking unit at power-on. Failure to
comply will result in electric shock.
Repair or maintain the braking unit only after ensuring that the input
bus voltage is lower than 36 VDC, 5 minutes after power off.
Otherwise, residual charge on the capacitor may result in personal
injury.
Set and check the parameters again after the braking unit is
replaced.
All the pluggable components must be plugged or removed only after
power-off.

Inovance MDBUN Series Braking Unit User Manual
Chapter 2 Product Information
2.1 Product Appearance and Designation Rules
Figure 2-1 Nameplate and designation rules of the MDBUN
MODEL: MDBUN-90-T
INPUT: DC 300 - 800V
OUTPUT: 0 - 90A
Suzhou Inovance Technology Co.,Ltd.
S/N: 010131264C800109
POWER: 63kW
Model
Rated power
Rated input
Rated output
S/N
Nameplate
Voltage Class
S220 VAC
Rated braking current
MDBUN 90 T
T380 VAC
5T 480 VAC
Series name
Position of
nameplate
2.2 Model and Technical Specifications
Table 2-1 Model and technical specifications of MDBUN series braking unit
Braking Unit
Model
Input Voltage
of Adaptable
Drive
Rated
Continuous
Braking Current
(A)
Peak
Braking
Current
(A)
Max.
Continuous
Braking Power
(kW)
Min. Braking
Resistance (Ω)
MDBUN-45-S
220 VAC
45
54
21
8
MDBUN-60-S
60
72
27
6
MDBUN-90-S
90
108
41
4
MDBUN-45-T
380 VAC
45
54
38
15
MDBUN-60-T
60
72
51
11
MDBUN-90-T
90
108
76
8
MDBUN-45-5
T
480 VAC
45
54
43
17
MDBUN-60-5
T
60
72
58
13
MDBUN-90-5
T
90
108
86
9

Inovance MDBUN Series Braking Unit User Manual
Page 5 of 24
2.3 Working Principle of the MDBUN
Figure 2-2 Application principle of the MDBUN braking unit
Status
indication Braking
control board
Operation
panel
interface
DI1
DO1
DO2
DC
+
P(+)
BR
External
braking
resistor
Block diagram of
the braking unit
Connect the common bus
terminal + of the drive
Connect the common bus
terminal –of the drive
DC Voltage
detection
Auxiliary
power supply
Braking
IGBT
–
The braking unit consumes the electric energy fed back from the motor to the drive to limit
the voltage of the drive within a secure range.
Before normal running of the braking unit, you need to set the braking start and stop
voltages based on theAC power voltage class of the drive. The following figure shows the
braking start and stop voltages and voltage during normal running of the main capacitor.
Figure 2-3 Working principle of the MDBUN braking unit
Acceleration or
stable-speed
running Braking running at
deceleration Stop Start Braking running at deceleration Stop
(P0-00)
(P0-01)
(P0-02)
Bus voltage (V)
Braking start
voltage
Braking stop
voltage
Normal bus voltage
Braking
IGBT state
Braking unit
DO output
Time (s)
As shown in the preceding figure, the relationship between three voltages is as follows:
Braking start voltage > Braking stop voltage> Normal bus voltage. When the braking unit
is in the master mode, the control circuit detects the bus voltage in real time. If the bus
voltage reaches the set braking start voltage (set in P0-00), the braking IGBT starts to
work and discharges the electricity in the main capacitor of the drive through the external
braking resistor, so that the bus voltage reduces to lower than the braking stop voltage
(set in P0-01). The start braking rate (set in P0-02) of the braking unit can also be set to
adjust the discharge rate during braking so as to change the braking time.