Fuji Electric FRENIC-Eco Series User manual

Instruction Manual
DB Unit
Dynamic Braking Unit
200V Series
37kW /BU37-2C
to 0kW /BU 0-2C
400V Series
37kW /BU37-4C
to 220kW /BU220-4C


CAUTION
■ Ensure that this instruction manual is made
available to the final user of the DB unit.
■ Read and understand all operating instructions
before installing, connecting (wiring), operating,
maintaining or inspecting the DB unit.
■ Keep this manual up to disposing the DB unit
carefully.
■ The product is subject to change without notice.
INR-HF51196c-E

Preface
Thank you for purchasing our dynamic braking unit (DB unit). This product is a device to discharge the braking
power to a resistor in a braking operation of the Fuji's inverter for general industry. The applicable inverter
models should be referred to Table A.
Read this manual carefully before using, understand the treatment method and use the DB unit correctly.
Incorrect use may result in obstruction of normal operation, shortening of the life or cause of failure. Keep this
manual carefully even after using.
As this manual does not cover the use of inverter, refer to relevant manuals for the inverter to be used.
Table A Applicable inverter models
Series Model
General-purpose inverter FRENIC5000 G5/P5,G7/P7,G S/P S,G11S/P11S series
FRENIC-Eco series
200V
Vector inverter FRENIC5000 VG3,VG5,VG7S series
General-purpose inverter FRENIC5000 G S/P S,G11S/P11S series
FRENIC-Eco series
400V
Vector inverter FRENIC5000 VG5,VG7S series
As following the old model is applicable to DB unit by special tuning before shipment, please
contact your local distributor or nearest Fuji Electric's sales office.
Series
Model
200V Vector inverter FRENIC5000 VG series
General-purpose inverter FRENIC5000 G5/P5, G7/P7 series 400V
Vector inverter FRENIC5000 VG,VG3 series
Safety instructions
Read this manual carefully before installing, connecting (wiring), operating, maintaining, or inspecting the DB
unit and use it correctly.
Familiarize yourself with all knowledge of the device, safety information and instructions before using.
In this manual, safety messages are classified as follows.


ARNING
Denotes operating procedures and practices that may result in personal injury or
loss of life if not correctly followed.


CAUTION
Denotes op
erating procedures and practices that may result in slight to medium
personal injury or property damage if not correctly followed.
Situation more serious than those covered by CAUTION will depend on prevailing circumstances.
Always follow the instructions as important contents are described in these.
Instruction on use


ARNING
・ This DB unit is designed to discharge the braking power to a resistor in a braking operation of the Fuji's
inverter for general industry. It cannot be used for others.
Fire may result.
・ This DB unit may not be used (as is) as a component of a life-support system or other medical device
directly affecting the personal welfare of the user.
・ This product is manufactured under strict quality control standards. However, safety equipment must be
installed if the failure of this device may result in heavy accident and/or property damage.
There is a risk of accident.

Instruction on installation


ARNING
・ Mount this DB unit on an material such as metal.
Fire may result.
・ Do not place combustible or flammable material near this DB unit。
Fire may result.
・ Contain the DB unit into a panel etc. so as not to be able to touch it easily.
Electric shock or accident may result.
・ Ensure that the specified bolts are used when installing the DB unit.
There is a risk of accident or injury.


CAUTION
・ Do not hold the front cover when carrying the DB unit.
Injury by dropping may result.
・ Ensure that the DB unit and cooling fins are kept free if foreign matters such as lint, paper, small chips of
wood or metal, or dust.
Fire or accident may result.
・ Do not install or operate a damaged DB unit or a DB unit missing parts.
Injury may result.
Instruction on wiring


ARNING
・ Use wires of the specified size for wiring.
Fire may result.
・ Do not connect the DC terminals (P(+) and N(-)) to the connection terminals on the inverter side in
mistake for the polarity （+ and –）.
Fire may result.
・ Ensure that the grounding wire is connected.
Electric shock or fire may result.
・ A licensed specialist must perform the wiring works.
Electric shock may result.
・ Turn off the power before starting the wiring work.
Electric shock may result.
・ Wire after the installation of the DB unit is complete.
Electric shock or fire may result.


CAUTION
・ Check that the rated voltage of the product complies with that of the inverter.
Injury may result.
・ Do not directly connect DC terminals (P(+) and N(-)) to the braking resistor.
Fire may result.
・ The DB unit and wiring generate noise. Take care the malfunction of the sensors and devices in
surroundings.
Accident may occur.

Instruction on operation


ARNING
・ Ensure that the power is turned on (close) after attaching the front cover. In energized status, do not
remove the cover.
Electric shock may result.
・ Do not touch the terminals of the DB unit in energized state of the inverter even if the inverter has stopped.
Electric shock may result.


CAUTION
・ Do not start and stop the inverter by turning on/off the main circuit power supply.
Failure may result.
・ Do not touch the cooling fins and braking resistor since they become very hot.
Burns may result.
・ The braking with this DB unit cannot function as mechanical holding.
Injury may result.
Instruction on maintenance, inspection, and parts replacement


ARNING
・ Wait a minimum ten minutes after the power has been turned off (open) before starting inspection.
Further, check that the charge lamp is turned off and that the DC voltage between the terminals P(+) and
N(-) do not exceed 25V.
Electric shock may result.
・ Only authorized personnel should perform maintenance, inspection, and replacement operations.
Take off metal jewelry such as watches and rings.
Use insulated tools.
Electric shock or injury may result.

Instruction on disposal


CAUTION
・ Treat the DB unit as industrial waste when disposing it.
Injury may result.
Other instructions


ARNING
・ Never modify the product.
Electric shock or injury may result.
Conformity to Low Voltage Directive in Europe


CAUTION
・ Ensure that the DB unit is grounded.
・ When wiring to the main circuit terminals and terminal for grounding of the inverter, use round terminals for the
cable.
・ Use a single cable to connect the grounding terminal G of the DB unit. (Do not use two or more wires
for the wiring.)
・ Use the DB unit under overvoltage category III conditions and maintain Pollution degree 2 or better as
specified in IEC 664. To maintain Pollution degree 2 or better, install the DB unit in a control panel (IP54 or
higher level) having a structure free from water, oil, carbon, dust, etc.
・ For the input-output wiring of the DB unit, use cable (wire diameter and type) as specified in Appendix C in
EN 60204.
・ To prevent electric shock at terminals or live parts, install the braking resistor as follows:
1) Install inside an IP4X cabinet or a barrier if electrical parts are exposed.
2) Install inside an IP2X cabinet or a barrier if electrical parts are not exposed.
GENERAL ATTENTION
Some illustrations in this manual are drawn in the status with removed cover or block for safety to describe in
detail. When operating the product, ensure that the cover or block is returned to the original as the
specification, and operate in accordance with the manual.

Compliance with UL/cUL standards ［
［［
［Applicable to products with UL/cUL mark］
］］
］
１．General
UL(Underwriters Laboratories Inc.) standards is safety standards for prevention of fire and other accident, and protect
user, maintenance man and people.
UL standards
ｃＵＬ standards is fixed standards conform with CSA standards. The products approved by ｃＵＬ is equivalent
to approval of CSA.
２．Notice
When using DB unit according to ＵＬ／ｃＵＬ standards, please refer to following notice.
CAUTION for UL/cUL requirements


 CAUTION
・ Hazard of electrical shock. Disconnect incoming power before working on this control.
・ Dangerous voltage exists until charge lights is off.
・ More than one live circuit.
・ Use 60/75℃ or 0℃ copper wire only.
・ A Class 2 circuit wired with class1 wire.
・ Field wiring connection must be made by a UL Listed and CSA Certified closed-loop terminal
connector sized for the wire gauge involved. connector must be fixed using the crimp tool
specified by the connector manufacturer.
・ For use with 3ph 200-220V/50Hz, 200-230V/60Hz Inverter Drives for models with suffix -2C.
・ For use with 3ph 380-440V/50Hz, 380-480V/60Hz Inverter Drives for models with suffix -4C.



 CAUTION
Tightening torque and wire range
１．60℃/75℃ copper wire
２． 90℃ copper wire
DB Unit Braking resistor Required torque [lb-inch](N.m)
Wire range
[AWG] (mm2)
Voltage
Applied
Motor
(kW) TYPE Q’ty
TYPE
Resistance
value(Ω)
Q’ty
Main
terminal
Ground
-ing Control
Main
terminal
Control
30 1 DB30-2C 4.0 1
37
BU37-2C
1 DB37-2C 3.0 1
31.0
(3.5)
31.0
(3.5)
14
(2.1)
45 1 DB45-2C 2.5 1
55
BU55-2C
1 DB55-2C 2.0 1
10
(5.3)
75 1 DB75-2C 1.6 1
200V
0
BU 0-2C
1 DB110-2C 1.2 1
11
(13.5)
11
(13.5)
6
(13.3)
30 1 DB30-4C 15 1
37
BU37-4C
1 DB37-4C 12 1
15.
(1.8)
45 1 DB45-4C 10 1
55
BU55-4C
1 DB55-4C 7.5 1
31.0
(3.5)
14
(2.1)
75 1 DB75-4C 6.5 1
0
BU 0-4C
1 1
51.3
(5.8) 51.3
(5.8)
12
(3.3)
110 1
DB110-4C 4.7
1
132
BU132-4C
1 DB132-4C 3. 1
11
(13.5)
11
(13.5)
8
(8.4)
160 1 DB160-4C 3.2 1
200 1 DB200-4C 2.6 1
400V
220
BU220-4C
1 DB220-4C 2.2 1
23
(27)
23
(27)
6.2
(0.7)
4
(21.2)
24
(0.2)
DB Unit Braking resistor Required torque [lb-inch](N.m)
Wire range
[AWG] (mm2)
Voltage
Applied
Motor
(kW) TYPE Q’ty
TYPE
Resistance
value(Ω)
Q’ty
Main
terminal
Ground
-ing Control
Main
terminal
Control
30 1 DB30-2C 4.0 1
37
BU37-2C
1 DB37-2C 3.0 1
31.0
(3.5)
31.0
(3.5)
10
(5.3)
45 1 DB45-2C 2.5 1
55
BU55-2C
1 DB55-2C 2.0 1
8
(8.4)
75 1 DB75-2C 1.6 1
200V
0
BU 0-2C
1 DB110-2C 1.2 1
11
(13.5)
11
(13.5)
4
(21.2)
30 1 DB30-4C 15 1
37
BU37-4C
1 DB37-4C 12 1
15.
(1.8)
14
(2.1)
45 1 DB45-4C 10 1
55
BU55-4C
1 DB55-4C 7.5 1
31.0
(3.5) 12
(3.3)
75 1 DB75-4C 6.5 1
0
BU 0-4C
1 1
51.3
(5.8) 51.3
(5.8)
10
(5.3)
110 1
DB110-4C 4.7
1
132
BU132-4C
1 DB132-4C 3. 1
11
(13.5)
11
(13.5)
6
(13.3)
160 1 DB160-4C 3.2 1
200 1 DB200-4C 2.6 1
400V
220
BU220-4C
1 DB220-4C 2.2 1
23
(27)
23
(27)
6.2
(0.7)
3
(26.7)
24
(0.2)

Contents
1 Before Using This Product
1-1 Inspection at receiving the unit 1-1
1-2 Appearance 1-1
1-3 Handling of the product 1-2
1-4 Carrying 1-2
1-5 Storage 1-2
2 Installation and Connection 2-1
2-1 Operating environment 2-1
2-2 Installation method 2-1
2-3 Connection 2-2
2-3-1 Basic connection 2-2
2-3-2 Connecting the main circuit and
grounding terminal ｓ 2-4
2-3-3 Connecting the control terminals 2-5
2-3-4 Terminal arrangement 2-7
2-3-5 Applicable devices and wire size as standard 2-8
3 Operation 3-1
3-1 Inspection and preparation before operation 3-1
4 Protective Operation 4-1
4-1 Protective operations 4-1
4-2 Alarm reset 4-1
5 Maintenance and Inspection 5-1
5-1 Daily inspection 5-1
5-2 Periodical inspection 5-1
5-3 Insulation test 5-2
5-4 Parts replacement 5-3
5-5 Inquiries about product and product guarantee 5-3
6 Specifications 6-1
6-1 Standard specifications 6-1
6-1-1 DB unit 6-1
6-1-2 Braking resistor 6-2
6-2 Outline dimensions 6-3
6-2-1 DB unit 6-3
6-2-2 Braking resistor 6-4
7 Option Fan 7-1
7-1 Specification 7-1
7-2 Attaching 7-1
7-2-1 Attaching 7-1
7-2-2 Wiring 7-1
7-3 Outline dimensions 7-2
7-3-1 Option fan unit 7-2

1-1
Front cover
Under of Unit(Mounting bord)
Fig. 1-1-1 Ratings nameplate
1 Before Using This Product
1-1 Inspection at receiving the unit
Unpack and inspect the unit for the following items.
If there are doubtable or complained items, contact the
distributor where the unit was purchased or the ompany's
sales office nearby.
① heck for the unit to be the ordered product by
inspecting the ratings nameplate.
TYPE : Type of the dynamic braking unit
COOLING : ooling system
SOURCE : Power rating
OUTPUT : Output rating
MASS : Mass of the product
SER.No. : Serial number
4 3 HH12345R678-001H
Production lot serial number:
Production month: 1--9 →Jan. --Sep.
X→Oct. Y→Nov. Z→Dec.
Production year : Last digit of year 8→1998
② Inspect if shipping damage such as damage or fall-off of the parts and depression of the cover or body.
③ Braking resistor is not attached. Prepare a resistor conforming with the specification separately.
1-2 Appearance
Nameplate
Warning
label
Front
cover
Fig. 1-2-1 Appearance Fig. 1-2-2 Warning label
BU 37 - 4 C
Standard series:
A power supply voltage series: 2→200V series、4→400V series
Rated output of the applied motor for the inverter as standard: 37→37kW
Product type

1-2
1-3 Handling of the product
(1) Removing the front cover
Loosen the mounting screws of front cover and remove the front cover by holding its upper part with
hands as shown in Fig. 1-3-1.
Mounting screws
of front cover
Fig. 1-3-1 Removing the front cover
1-4 arrying
When carrying the product, hold only the main body of the product surely.
If holding the cover or parts, it may result in damage or fall-off.
1-5 Storage
Storage the products in the environment as shown in Table 1-5-1.
Table 1-5-1 Storage environment
Item Specification
Ambient.
temperature –10 to +50°
Storage
∗1
temperature –25 to +65°
Relative humidity 5 to 95%
∗2
The location without condensation or freezing by sharp
temperature change
Atmosphere
Without dust, direct sunlight, corrosive gas, inflammable gas, oil mist, vapor,
water drop and vibration
Not including too much of salt
∗1: The storage temperature means in a case of a short time such as transport.
∗2: Although the humidity conforms to the specified value, condensation or freezing occurs in a
location of large temperature change. Avoid such location.
① Do not put the product directly on a floor.
② If the surrounding atmosphere is not good, store the product packed with a vinyl sheet etc.
③ If the humidity may affect the product, put a desiccant ( such as silica gel) into the package as shown
in .

2-1
DB Unit
Top
Bottom 100mm
Right
Left
100m m
50mm
or more
50mm
or more
2 Installation and Connection
2-1 Operating environment
Install the DB unit in the environment shown in Ta le 2-1-1.
Ta le 2-1-1 Operating environment
Item Specifications
Location Indoor
Am ient
temperature
–10 to +50℃
Relative
humidity
5 to 95% (no condensation)
Atmosphere
Without dust, direct sunlight, corrosive gas, oil mist and vapor, water drop
Not including too much of salt
Without condensation y sharp temperature change
Altitude
1,000m or less
(When exceeding 1,000m, decrease the inverter output in accordance with Instruction
Manual of the inverter.)
Vi ration 3.0mm at 2 to 9Hz, 9.8m/s
2
at 10 to 20Hz, 4.9m/s
2
at 20 to 55Hz, 1.0m/s
2
at 55 to 200Hz
2-2 Installation Method
① Securly fasten the DB unit in an upright position on a solid structure
such that the characters of the la el is facing the front. Do not turn the
DB unit
upside down or install in a horizontal position.
② As heat is generated during DB unit operation, the spaces shown
in Fig. 2-2-1 are required to ensure sufficient cooling pass. As
heat radiates upward, do not install the DB unit eneath a device
sensitive to heat.
③ As the cooling fins may reach a temperature of 90℃ during DB
unit operation, ensure that the material of the attaching face at
ack of the DB unit can withstand this temperature.
Fig. 2-2-1


WARNING
Install the DB uint on nonflamma le material such as metal.
Fire may result.
④ When installing the DB unit in a control panel, consider sufficient ventilation to prevent am ient
temperature of the DB unit from exceeding the specified value. Do not install in a small tightly closed ox.
⑤ If installing two or more inverters or DB units in the same device or control panel, arrange them horizontally
to minimize the effect of heat. If they must e installed vertically, place isolation plates etween them to
minimize the effect of heat.


CAUTION
Ensure that the DB unit and cooling fins are kept free of foreign matter such as lint,
paper dust, small chips of wood or metal, and dust.
Fire or accident may result.

2-2
2-3 Connection
When removing the front cover, the terminal locks appear (see Fig. 2-3-1). Connect the ca les without
mistake caring the following items.
2-3-1 Basic connection
① Connect the link circuit connection terminals (P(+), N(-)) of the DB unit to the link circuit connection
terminals (P(+), N(-)) of the inverter. If mistaking the polarity or connecting to the other terminal, the
DB unit may e damaged. Further, check the power supply voltage for conforming to the inverter
specification.
② Ensure to ground the grounding terminal to prevent disasters such as electric shock and fire and to
minimize noise.
③ Use a relia le crimp terminal for connection etween a terminal and a ca le.
④ After terminating the connection (wiring), check the followings:
a. Check that the connection is correct.
. Check that all necessary connections have een made.
c. Check that there is no short-circuit or ground fault etween terminals and ca les.
⑤ Connection modification after power-on
The smoothing capacitor in the direct current portion of the main circuit cannot e discharged
immediately after the power is turned off. To ensure safety, use a multimeter to check that the voltage
of the direct current (DC) is lowered to the safety range (25V DC or less) after the charge lamp goes
off. Also, check that the voltage is zero efore short-circuiting. The residual voltage (electric charge)
may causes sparks.



WARNING
・ Always connect a grounding wire.
Electric shock or fire may result.
・ Ensure that a licensed specialist performs all wiring works.
・ Check that the power is turned off (open) efore commencing wiring operations.
Electric shock may result.
Front view of inside the unit
Fig. 2-3-1 Front view after removing the front cover

2-3
■
■■
■ Basic connection diagram
Basic connection diagram Basic connection diagram
Basic connection diagram
1) In case of using one DB unit and one raking resistor
Inverter DB unit
Braking
resistor
P(+)R
P(+)
N(-)
CHARGE
DB
G
G1 2
i1 i2 o1 o2 1 2
Option
fan
P(+)
N(-)
External
alarm Input
(*1)
CM
Control circuit
Main circuit
P1
Ｍ
CN5,6
Wire length 5m or less
Wire length
10m or less
SW1
1
2
3
P
DB
(*2)
++
(*4)
Fig. 2-3-2-1
2) In case of using two DB units and two raking resistors ( ∗ 3)
Inverter
P(+)
N(-)
External
alarm Input
(*1)
CM
Control circuit
Main circuit
P1
Ｍ
DB unit[Master]
Braking
resistor
P(+)R
P(+)
N(-)
CHARGE
DB
G
G
1 2
i1 i2 1 2
Option
fan
CN5,6
o1 o2
DB unit[Slave]
Braking
resistor
G
P(+)R
P(+)
N(-)
CHARGE
DB
G
1 2
i1 i2 1 2
Option
fan
CN5,6
o1 o2
Wire length
1.5m or less
Wire length 5m or less
Wire length
10m or less
SW1
1
2
3
SW1
1
2
3
P
DB
P
DB
(*2)
+ +
+
(*4)
Fig. 2-3-2-2
(∗1) Among the inverters. assignment to the digital input terminals can e ar itrarily changed
in some inverters. Select the external alarm input y function setting.
(∗2) Do not short-circuit the not using terminals of the control PCB in the DB unit.
(∗3) The parallel connection of the DB units is up to two units.
When necessary to connect 3 or more DB units, contact us separately.
(∗4) Connect a lump-sum alarm output of the DB unit and raking resistor to the external alarm
input, and construct a sequence to open the electromagnetic contactor y the lump-sum
alarm output of the inverter.
Applied inverter series
200V class
FRENIC5000 G5/P5,G7/P7,G9S/P9S
,G11S/P11S series
FRENIC-Eco
FRENIC5000 VG3,VG 5,VG7S
400V class
FRENIC5000 G9S/P9S
,G11S/P11S series
FRENIC-Eco
FRENIC5000 VG5,VG7S

2-4
2-3-2 Connecting the main circuit and grounding terminals
Ta le 2-3-1Functions of the main circuit terminals and grounding terminal
Terminal
marking Name of terminal Description
P(+), N(-) DC link circuit terminals Connecting to the DC link circuit voltage of the inverter
P(+)R, DB
Connection terminals for
raking resistor Connecting to the raking resistor


G Terminal for grounding DB unit Grounding terminal of the chassis (case) of the DB unit
(1) DC link circuit terminals (P(+) and N(-))
① Connect the DC link circuit terminals P(+) and N(-) of the inverter to the terminals P(+) and N(-) of the
DB unit.
② Arrange the wire rout so that the wire length is less than 5m. Further, arrange the two wires to e twisted
or closely contacted (parallel) wiring.
③ Do not connect to an AC power supply.
(2) Connection terminals for raking resistor (P(+)R and DB)
① Connect the terminals P and DB of the raking resistor to the terminals P(+)R and DB of the DB unit.
② Arrange the wire rout so as the wire length is less than 10m. Further, arrange the two wires to e twisted
or closely contacted (parallel) wiring.
③ Do not connect to an AC power supply.
(3) Terminal for grounding DB unit (G)
Ensure that the terminal G for grounding DB unit is grounded ecause of safety and countermeasure for
noise. To prevent disasters such as electric shock and fire, the Electric Facility Technical Standard specifies
on the grounding work for a metallic frame of electrical equipment.
Perform the connection as follows:
① In accordance with the Electric Facility Technical Standard, connect the terminal to a grounding pole
made y type D grounding for 200V series and to a grounding pole made y type C grounding for 400V
series.
② Use a suita le ca le (thick and short) to connect the grounding terminal to the grounding pole specific
for the inverter system.
Ta le 2-3-2
Voltage
series Sort of the grounding work Grounding
resistance
200V Type D grounding 100Ωor less
400V Type C grounding 10Ω or less


CAUTION
・ Do not connect an AC power supply to the DC link circuit terminals (P(+) and
N(-)).
amage may result.
・ Do not directly connect the raking resistor to the DC link circuit terminals (P(+)
and N(-)).
・ Check that the product specification complies with the inverter to e connected.
・ When the DB unit is damaged, the raking resistor may a normally heated.
Make a sequence to interrupt the power supply on the inverter side y an alarm
signal.
Fire may result.

2-5
2-3-3 Connecting the control terminals
Function descriptions of the control terminals are shown in Ta le 2-3-3.
Ta le 2-3-3
Terminal
marking Name of terminal Function description
i1, i2 DB driving signal input terminals Connecting the DB drive signal wire of the unit on the
slave unit (∗1) side when using the units in parallel
o 1, o 2 DB driving signal output terminals Connecting the DB drive signal wire of the unit on the
master unit (∗2) side when using the units in parallel
1, 2 DB unit lump-sum alarm output
Outputting the alarm for overheat and lown fuse of
DB driving IGBT and raking resistor, and conduction
a normal of DB driving IGBT
CN5, CN6
Connectors for power supply of
option fans
Connecting power supply of option fans when installing
them
(∗1) The unit operating y receiving DB driving signal from the unit on the master side
(∗2) The unit operating y detecting DB operation level y itself from the link circuit voltage
(1) DB driving signal input terminals (i1 and i2)
DB driving signal output terminals (
o 1 and o 2)
① These terminals connect etween master and slave
when using 2 DB units.
② To reduce the noise effect from outside, use twisted
wires as short as possi le (1.5m or less).
③ Change over the settings of master and slave in the DB
units with SW1 on the PCB as shown in Fig. 2-3-3.
④ When using single DB unit, set the SW1 as shown in a).
⑤ Do not short-circuit not used terminals.
(2) DB unit lump-sum alarm output (1 and 2)
① Connect the terminals of the DB units and raking
resistors in series in the order of 1212 to the
contact input terminals of the inverter which are
assigned external alarm input to.
When used a short-circuit conductor on the contact
input terminals to e connected on the inverter side,
remove the short-circuit conductor.
(3) Connectors for power supply of option fans (CN5 and
CN6)
① When using option fans, the power supply lines of the
fans are connected to these terminals.
② Connectors CN5 and CN6 have a same function.
③ Do not short-circuit these connectors ecause of power
supply connection.
(4) Others
① Perform the wiring of the control terminals separating
from the wiring of the main circuit as far as possi le.
Otherwise, malfunction y noise may e caused.
② Fix the control wiring inside the unit so as not to directly
contact with a live part of the main circuit (e. g. main
circuit terminal lock).
③ The parallel connection of the DB units is up to two units.
When necessary to connect 3 or more DB units, contact
us separately.


WARNING
• Since the insulation of control ca le is generally not of reinforced insulation,
high voltage may intrude into the control signal if insulation sheath is roken y
any cause.
Electric shock may result.


 CAUTION
• A noise is generated from inverter, motor,wiring. etc. Take care on malfunction
of sensors and devices in the surroundings.
• Be sure not to move the setting of the varia le resistor VR1 on the control PCB
since it has een adjusted.
Accident may result.
1
2
3
1
2
3
SW1
SW1
SW1
SW1
a)Unit connecting
the terminals o1 and o2(Master side)
b)Unit connecting
the terminals i1 and i2(Slave side)
Fig. 2-3-3 Changeover of SW1
Switch
ＳＷ１
CN6 CN5
Control
circuit
block
Fig 2-3-4 Control PCB

2-6
(5) Wiring of the control circuit
① Lead out the ca le along the left side panel as shown in Fig. 2-3-5.
② Secure the ca le to ca le-tie holder on the left wall of the main circuit terminal lock on the way of lead out
using a ca le-tie (e. g. insulock). The ca le-tie must not exceed 3.5mm or less in width and 1.5 mm or less
in thickness to pass through a rectangular hole (3.8×1.5).
Cables of
control circuit
Side panel (LEFT)
Cables
Cable-tie
Cable-tie
holder
Fig. 2-3-5 Route of control circuit wiring

2-7
2-3-4 Terminal arrangement
(1) Main circuit terminals
BU37-2C
Screw size M5
Screw size M5
BU220-4C
Screw size M10
BU37-4C
Screw size M4
Screw size M5
BU55-2C
Screw size M8
Screw size M8
BU55-4C
Screw size M6 Screw size M6
Screw size M5
BU90-2C
BU-132-4C
Screw size M8
BU90-4C
Screw size M6
(2) Control terminals
Screw size M3
G G
DB P(+)R P(+) N(-)
G G
DB P(+)R P(+) N(-)
G G
DB P(+)R P(+) N(-) i1 i2 o2
o1 2 1
G G
DB P(+)R P(+) N(-)
G G
DB P(+)R P(+) N(-)
G G
DB P(+)R P(+) N(-)
G G
DB P(+)R P(+) N(-)

2-8
2-3-5 Applica le devices and wire size as standard
DB unit Braking resistor Tightening torque
(N ･ m)
Recommended wire size
(
mm
2
) ∗1)
Voltag
e
Applied
motor
(kW) Type No.
Type
Resistanc
e
value ( Ω )
No.
Main
circuit
Ground-
ing
Control
DB cct. (P(+),
N(-),P(+)R,DB)
Ground.
(  G)
Control
30 1 DB30-2C 4.0 1 2
37 BU37-2C 1 DB37-2C 3.0 1
3.5
45 1 DB45-2C 2.5 1
3.5
55 BU55-2C 1 DB55-2C 2.0 1 5.5
75 1 DB75-2C 1.6 1 8
200V
90 BU90-2C 1 DB110-2C 1.2 1
13.5
0.7
14
1.25
30 1 DB30-4C 15 1
37 BU37-4C 1 DB37-4C 12 1
1.8
45 1 DB45-4C 10 1
55 BU55-4C 1 DB55-4C 7.5 1
5.8
3.5
75 1 DB75-4C 6.5 1
2
90 BU90-4C 1 1
3.5
110 1
DB110-4C 4.7 1
132 BU132-4C 1 DB132-4C 3.9 1
13.5 5.5
160 1 DB160-4C 3.2 1 8
200 1 DB200-4C 2.6 1
400V
220
BU220-4C
1
DB220-4C
∗2)
2.2 1
27
0.7
14
1.25
∗1) The type of using wire is 75°C 600V Grade heat-resistant
polyvinyl chloride insulated wire (HIV).
The a ove-mentioned wire sizes are the recommended size
under the condition of the am ient temperature 50°C or lower.
∗2) A DB220-4C set is constructed y 2 ca inets.
These 2 resistors are used connecting in parallel.

3-1
3 Operation
3-1 Inspection and preparation before operation
Inspect the following items before operation
① Check that the connection is correct.
In particular, check the following points:
a. Check that the AC power suppl is not connected to
an of DC link circuit terminals P(+) and N(-) or
connection terminals for braking resistor P(+)R and DB.
b. Check that the DC link circuit voltage is not connected
to the connection terminals for braking resistor P(+)R
and DB.
c. Check that the grounding terminal is securel
grounded.
② Check for short-circuits and ground faults between the
terminals and live sections.
③ Check for loose terminals, connectors, or screws.
Check the followings after power-on.
① Check that no external alarm message is displa ed on the inverter.
② Check that the CHARGE lamp is turned off.
③ Check that the fans are rotating (when using option fans).


WARNING
• Be sure to put on the front cover before turning on the power (close). Never
remove the cover while the power is applied to the inverter.
Electric shock may result.
G, P(+), N(-), P(+)R, DB
P(+)
N(-)
P
DB
DB unit
Fig. 3-1-1 DB unit connection diagram
Inverter
Braking
resister

4-1
4 Protective Operation
4-1 Protective operations
In the event of abnormality as shown in Table 4-1, the DB unit stops DB drivin si nal and outputs a lump-sum
alarm si nal from the terminals 1 and 2 (The lump-sum alarm si nal has no distinction of the abnormality
contents.).
By this alarm si nal, the protective function of the inverter will be immediately activated to trip the inverter and
display the external alarm on the keypad panel, and the motor coasts-to-a stop.
Since the brakin resistor may be overheated when the DB unit is out of order, construct a sequence to trip the
power supply in the case of activation of the inverter protective function.
Table 4-1
Abnormality Contents
Blown fuse If the fuse in the main circuit of the DB unit is blown out followin a short-
circuit in
the circuit or dama e, the protective function is activated.
Overheatin of the
coolin fins
If the cooli
n fins overheat followin frequent use of brakin exceedin the
specification, hi h ambient temperature or clo of the fins, the protective function
is activated.
Conduction abnormal of
IGBT(switchin element)
If detectin conduction of IGBT (switchin e
lement) althou h stoppin of the DB
drivin si nal, the protective function is activated.
Overheatin of the
brakin resistor
If the brakin resistor overheats followin hi h-
frequent use of the brakin
resistor, the protective function is activated.
4-2 Alarm reset
If becomin the trip status, release the trip in accordance with the instruction of the inverter Instruction Manual
after removin the cause of the trip.
When releasin the trip status, set the operation command to OFF. Take care, if the operation command is set
to ON, the inverter starts operation after resettin .


WARNING
If the alarm reset is activated with the operation si nal ON, the inverter will restart
suddenly, which may be dan erous. To ensure safety, release the trip status after
checkin the operation si nal OFF.
Accident may result.