VFDB Series

Preface
Congratulations on your purchase of DELTA’s braking module. VFDB braking units are
applied to absorb the motor regeneration energy when the three phase induction motor stops
by deceleration. With VFDB braking unit, the regeneration energy is dissipated by braking
resistors. To avoid mechanical or human injury, please refer to this user manual before wiring.

VFDB braking units are suitable for DELTA AC Motor Drives VFD Series 230V/460V. VFDB
braking units need to be used in conjunction with BR series braking resistors to provide the
optimum braking characteristics.

VFDB braking units (2015, 2022, 4030 and 4045) are approved by Underwriters Laboratories,
Inc. (UL) and Canadian Underwriters Laboratories (cUL)

DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED

VFDB Series

DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED

 VFDB Series

Chapter 1 Specification.................................................................................. 1
Chapter 2 Dimension ..................................................................................... 2
Chapter 3 Individual Parts and Function Explanation .................................... 3
Chapter 4 Basic Wiring Diagram.................................................................... 4
Chapter 5 Wiring Notice................................................................................. 5
Chapter 6 Definition for Braking Usage ED ................................................... 6
Chapter 7 Setting and Regulation.................................................................. 7
Chapter 8 Summary for Braking Units and Braking Resistors ....................... 9
Chapter 9 Wiring Examples of Braking Resistors .......................................... 10

DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED

VFDB Series

DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED

 VFDB Series

CHAPTER 1 SPECIFICATION
1. Specification of VFDB Braking Units
Model 230V Series 460V Series
VFDB-
2015 2022 4030 4045
Specification
Max. Motor Capacity (KW) 15 22 30 45
Max. Peak Discharge
40 60 40 60
Output Rating

Current (A) 10%ED

Continuous Discharge
15 20 15 18
Current (A)
Braking Start-up
330/345/360/380/400/415±3V 660/690/720/760/800/830±6V
Voltage (DC)
Rating
Input

DC Voltage 200~400VDC 400~800VDC

Heat Sink Overheat Temperature over +95℃

Protection

Alarm Output Relay contact 5A120VAC/28VDC (RA, RB, RC)

Power Charge Display Blackout until bus (+~-) voltage below 50VDC
Installation Location Indoor (no corrosive gases, metallic dust)
Usage Environment

Operating
-10℃~+50℃
Temperature
Storage Temperature -20℃~+60℃
Humidity 90%R.H., Non-condensing
9.8m/s2 (1G) under 20Hz
Vibration
2m/s2 (0.2G) at 20~50Hz
Mechanical Configuration Wall-mounted enclosed type IP50

2. Specification of Braking Resistors

Model no. Specification
BR1K5W005 1500W 5.0Ω
BR1K2W6P8 1200W 6.8Ω
BR1K2W008 1200W 8.0Ω
BR1K5W040 1500W 40Ω
BR1K0W050 1000W 50Ω

DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED 1

 VFDB Series

CHAPTER 2 DIMENSION
Braking unit
121.0 [4.76] 130.0 [5.12]
80.0 [3.15] R3.3 [R0.13]

CHARGE ACT. ERR.

GREEN YELLOW RED

200.0 [7.87]
189.5 [7.46]

Braking resistor

2 DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED

 VFDB Series

CHAPTER 3 INDIVIDUAL PARTS AND FUNCTION EXPLANATION

Terminal Wire Gauge

Terminal Wire Gauge

Circuit Terminal Torque
Mark AWG/mm2
Power Input Circuit +(P), -(N) 10~12AWG/3.5~5.5mm2 M4 Screw 18 KG-CM
Braking Resistor B1, B2 10~12AWG/3.5~5.5mm2 M4 Screw 18 KG-CM
M1, M2
SLAVE and Fault 20~18AWG/0.25~0.75mm2
S1, S2 M2 Screw 4 KG-CM
Circuit M1, M2, S1, S2 with shielded wires
RA, RB, RC

DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED 3

 VFDB Series

CHAPTER 4 BASIC WIRING DIAGRAM

NFB
MC
R/L1 R/L1 U/T1
S/L2 S/L2 V/T2 IM
T/L3 T/L3 W/T3 MOTOR
Thermal Overload
O.L. Relay
VFD + ( P ) +(P ) B1
MC Series O.L.
Thermal -( N) - ( N ) VFDB
Overload SA
Braking BR
Relay Surge E.F RA
Unit
Absorber DCM B2
RC
Braking Resistor

Note1: When AC drive uses with DC reactor, please refer to wiring diagram in AC drive user
manual for the wiring of terminal +(P) of Braking unit.
Note2: Do NOT wire terminal -(N) to neutral point of power system.

Operation Explanation:
1. For safety consideration, install an overload relay between the braking unit and the
braking resistor. In conjunction with the magnetic contactor (MC) prior to the drive, it can
perform complete protection against abnormality.
2. The purpose of installing the thermal overload relay is to protect the braking resistor from
damage due to frequent braking, or due to braking unit keeping operating resulted from
unusual high input voltage. Under such circumstance, just turn off the power to avoid
damaging the braking resistor.
3. Please refer to chapter 3 for the specification of the thermal overload relay.
4. The alarm output terminals (RC, RA, BB) of the braking unit will be activated when the
temperature of the heat sink exceeds 95℃. It means that the temperature of the
installation environment may exceed 50℃, or the braking %ED may exceed 10%ED.
With this kind of alarm, please install a fan to force air-cooling or reduce the environment
temperature. If the condition not due to the temperature, the control circuit or the
temperature sensor may have been damaged. At this time, please send the braking unit
back to the manufacturer or agency for repair.
5. The AC Motor Drive and braking unit will be electrified at the same time while turning on
the NFB (No-fuse breaker). For the operation/stop method of the motor, please refer to
the user manual of the AC Motor Drives VFD Series. The braking unit will detect the inner
DC voltage of the AC motor drive when it stops the motor by deceleration. The extra
regeneration will be dissipated away rapidly by the braking resistor in the form of heat. It
can ensure the stable deceleration characteristic.

4 DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED

 VFDB Series

CHAPTER 5 WIRING NOTICE

! 1. Do not proceed with wiring while power is applied to the circuit.

! 2. The wiring gauge and distance must comply with the electrical code.
! 3. The +(P), -(N) terminals of the AC motor drive (VFD Series), connected to the
braking unit (VFDB), must be confirmed for correct polarity lest the drive and the
braking unit be damaged when power on.
! 4. When the braking unit performs braking, the wires connected to +(P), -(N), B1 and
B2 would generate a powerful electromagnetic field for a moment due to high current
passing through. These wires should be wired separately from other low voltage
control circuits lest they make interference or mis-operation.
! 5. Wiring distance

VFD series VFDB

2015
2022 BR
11~22kW Max 10M 4030 Max 5M
230/460V 4045
AC Motor Drive Braking Unit Braking Resistor

! 6. Inflammable solids, gases or liquids must be avoided at the location where the
braking resistor is installed. The braking resistor had better be installed in
individual metallic box with forced air-cooling.
! 7. Connect the ground terminal to the Earth Ground. The ground lead must be at least
the same gauge wire as leads +(P), -(N).
! 8. Please install the braking resistor with forced air-cooling or the equivalent when
frequent deceleration braking is performed (over 10%ED).
! 9. To avoid personal injury, do not connect/disconnect wires or regulate the
setting of the braking unit while power on. Do not touch the terminals of
related wiring and any component on PCB lest users be damaged by extreme
dangerous DC high voltage.
! 10. The ring terminals are suggested to be used for main circuit wiring. Make sure the
terminals are fastened before power on.

DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED 5

 VFDB Series

CHAPTER 6 DEFINITION FOR BRAKING USAGE ED%

100%

T1 ED% = T1/T0x100(%)
Braking Time
T0
Cycle Time

Explanation:
The definition of the barking usage ED(%) is for assurance of enough time
for the braking unit and braking resistor to dissipate away heat generated by
braking. When the braking resistor heats up, the resistance would increase with
temperature, and braking torque would decrease accordingly.

6 DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED

 VFDB Series

CHAPTER 7 SETTING AND REGULATION

1. Regulation of power voltage: the power source of the braking unit is DC voltage from +(P),
-(N) terminals of the AC motor drive. It is very important to set the power voltage of the
braking unit based on the input power of the AC motor drive before operation. The setting
has a great influence on the potential of the operation voltage for the braking unit. Please
refer to the table below.

Table 1: The Selection of Power Voltage and Operation Potential of PN DC Voltage

230V Model Braking Start-up voltage 460V Model Braking Start-up voltage
AC Power DC Bus (+(P), -(N)) AC Power DC Bus (+(P), -(N))
Voltage Voltage Voltage Voltage
190Vac 330Vdc 380Vac 660Vdc
200Vac 345Vdc 400Vac 690Vdc
210Vac 360Vdc 415Vac 720Vdc
220Vac 380Vdc 440Vac 760Vdc
230Vac 400Vdc 460Vac 800Vdc
240Vac 415Vdc 480Vac 830Vdc
Input Power With Tolerance ±10%

CHARGE ACT ERR

Power lamp Braking lamp Fault lamp

Input Voltage Setting 480V 240V
460V 230V
440V 220V
415V 210V
400V 200V
380V 190V
For VFDB-4030/4045 Series For VFDB-2015/2022 Series
Factory setting: 460V Factory setting: 230V

Note: A. Before regulating the power voltage, make sure the power has been turned off.
B. Please set power voltage as the possible highest voltage for unstable power system.
Take 380VAC power system for example. If the voltage may be up to 410Vac,
415VAC should be regulated.
C. For DELTA’s AC motor drive VFD Series, please set parameter (Over Voltage Stall
Prevention ) as “close” to disable over-voltage stall prevention, to ensure stable
deceleration characteristic.

DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED 7

 VFDB Series

2. MASTER/SLAVE setting: The MASTER/SLAVE jumper is set “MASTER” as factory setting.

The “SLAVE” setting is applied to two or more braking units in parallel, making these
braking units be enabled/disabled synchronously. Then the power dissipation of each unit
will be equivalent so that they can perform the braking function completely.
Wiring Example:

+(P ) -( N) +(P ) -( N) +(P ) -( N) +(P ) -( N)

M1 S1 M1 S1
M2 S2 M2 S2
VFD
Series SLAVE SLAVE
MASTER

B1 B2 B1 B2 B1 B2

O.L. BR O.L. BR O.L. BR

The SLAVE braking application of three braking units is shown as the above diagram. After
wiring, the jumper of first unit shall be set as “MASTER” and that of others must be set as
“SLAVE” to complete the system installation.
The position of the jumper:

CHARGE ACT ERR

Slave
output/input
Terminal Power lamp Braking lamp Fault lamp
M2 M1 S2

480V 240V
460V 230V
440V 220V
415V 210V
SLAVE 400V 200V
380V 190V
S1

M1：SLAVE output signal +

MASTER M2：SLAVE output signal -
RC RB RA

MASTER/SLAVE S1：SLAVE input signal +

Setting Jumper
S2：SLAVE input signal -

NOTE: Please use shielded wires

while wiring.
Alarm output terminals

8 DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED

 VFDB Series

CHAPTER 8 ALL BRAKING RESISTORS & BRAKING UNITS USE IN AC DRIVES

AC Drive Braking Unit Discharged Resistor

Typical
Braking Thermal
Equivalent

Numbers

Numbers
Applicable Model Resistor Model Torque Overload
Voltage

Resistors
Motor Number- Specification for Number- 10%ED Relay
Specification for
KW(HP) VFDB a Resistor BR Value
Each Braking Unit

11(15) 2015 1 1200W 6.8Ω 2 1K2W6P8 2400W 13.6Ω 125 20A

15(20) 2015 1 1500W 5Ω 2 1K5W005 3000W 10Ω 125 30A

18.5(25) 2022 1 1200W 8Ω 4 1K2W008 4800W 8Ω 125 35A

230V

22(30) 2022 1 1200W 6.8Ω 4 1K2W6P8 4800W 6.8Ω 125 40A

30(40) 2015 2 1500W 5Ω 4 1K5W005 3000W 10Ω 125 30A

37(50) 2015 2 1500W 5Ω 4 1K5W005 3000W 10Ω 100 30A

45(60) 2022 2 1200W 6.8Ω 8 1K2W6P8 4800W 6.8Ω 120 30A

11(15) 4030 1 1000W 50Ω 1 1K0W050 1000W 50Ω 135 10A

15(20) 4030 1 1500W 40Ω 1 1K5W040 1500W 40Ω 125 15A

18.5(25) 4030 1 1200W 8Ω 4 1K2W008 4800W 32Ω 125 15A

22(30) 4030 1 1200W 6.8Ω 4 1K2W6P8 4800W 27.2Ω 125 20A

460V

30(40) 4030 1 1500W 5Ω 4 1K5W005 6000W 20Ω 125 30A

37(50) 4045 1 1200W 8Ω 8 1K2W008 9600W 16Ω 125 40A

45(60) 4045 1 1200W 6.8Ω 8 1K2W6P8 9600W 13.6Ω 125 50A

55(75) 4030 2 1500W 5Ω 8 1K5W005 6000W 20Ω 125 30A

75(100) 4045 2 1200W 6.8Ω 16 1K2W6P8 9600W 13.6Ω 125 50A

DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED 9

 VFDB Series

CHAPTER 9 WIRING EXAMPLES OF BRAKING RESISTORS

NOTE: Before wiring, please notice equivalent resistors value shown in the column
“Equivalent resistors specification for each braking unit” in the previous page
to avoid damage.
1. For 230V 15HP/20HP:
Thermal Overload
Relay
B1
+( P ) +(P )
VFD O.L.
Series - ( N ) -( N)
VFDB
2015 Braking
VFD110_23_ Resistor
Braking
VFD150_23_ Unit
B2
VFD110_23_ uses with 2PCS BR1K2W6P8 braking resistors in series
VFD150_23_ uses with 2PCS BR1K5W005 braking resistors in series

2. For 230V 25HP/30HP :

Thermal Overload
Relay
B1
+ (P ) + (P )
O.L.
VFD VFDB
-( N) - ( N ) 2022
Series Braking
Braking Resistor
Unit
VFD185_23_
VFD220_23_
B2
VFD185_23_ uses with two BR sets in parallel, which 2PCS BR1K2W008 braking resistors
in series for each BR set.
VFD220_23_ uses with two BR sets in parallel, which 2PCS BR1K2W6P8 braking resistors
in series for each BR set.

3. For 230V 40HP/50HP:

Thermal Overload Relay
Thermal Overload Relay
+(P ) - (N) + ( P ) - ( N ) B1 + ( P ) - ( N ) B1
VFDB O.L. VFDB O.L.
VFD 2015 2015
Series Braking Braking
Unit Unit
VFD300_23_ SLAVE
VFD370_23_ MASTER
B2 B2
M1 M2 Braking S1 S2 Braking
Resistor Resistor

VFD300_23_ / VFD370_23_ use with two VFDB2015 braking units, and each braking
unit uses with 2PCS BR1K5W005 braking resistors in series.
10 DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED
 VFDB Series

4. For 230V 60HP:

Thermal Overload Relay Thermal Overload Relay

+ (P ) - (N ) + ( P ) - ( N ) B1 + ( P ) - ( N ) B1
VFDB O.L. VFDB O.L.
VFD 2022 2022
Series Braking Braking
Unit Unit
VFD450_23_ SLAVE
MASTER B2 B2
M1 M2 Braking S1 S2 Braking
Resistor Resistor

VFD450_23_ uses with two VFDB2022 braking units, and each braking unit uses with two
BR sets in parallel, which 2PCS BR1K2W6P8 braking resistors in series.

5. For 460V 15HP/20HP:

Thermal Overload
Relay
B1
+(P ) +(P )
O.L.
VFD VFDB
- (N) -( N)
Series 4030
Braking
VFD110_43_ Unit
VFD150_43_ Braking
Resistor
B2
VFD110_43_ uses with 1PCS BR1K0W050 braking resistor
VFD150_43_ uses with 1PCS BR1K5W040 braking resistor

6. For 460V 25HP/30HP/40HP:

Thermal Overload
Relay
B1
+(P ) +(P )
O.L.
VFD VFDB
-( N) - ( N ) 4030
Series
Braking
Unit Braking
VFD185_43_ Unit
VFD220_43_
VFD300_43_ B2
VFD185_43_ uses with 4PCS BR1K2W008 braking resistors in series
VFD220_43_ uses with 4PCS BR1K2W6P8 braking resistors in series
VFD300_43_ uses with 4PCS BR1K5W005 braking resistors in series

DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED 11

 VFDB Series

7. For 460V 50HP/60HP:

Thermal Overload
Relay
B1
+(P ) + (P )
O.L.
VFD
- (N ) -(N)
Series VFDB
4045 Braking
VFD370_43_ Resistor
Braking
VFD450_43_ Unit
B2
VFD370_43_ uses with two BR sets in parallel, which 4PCS BR1K2W008 braking resistors in series
for each BR set.
VFD450_43_ uses with two BR sets in parallel, which 4PCS BR1K2W6P8 braking resistors in series
for each BR set.

8. For 460V 75HP:

Thermal Overload Relay
Thermal Overload Relay
+ (P ) - (N ) + ( P ) - ( N ) B1 + (P ) - (N ) B1
VFDB O.L. VFDB O.L.
VFD 4030 4030
Series Braking Braking
Unit Unit
VFD550_43_ SLAVE
MASTER
B2 B2
M1 M2 S1 S2
Braking Resistor Braking Resistor

VFD550_43_ uses with two VFDB4030 braking units, and each braking unit uses with
4PCS BR1K5W005 braking resistors in series.
9. For 460V 100HP:

Thermal Overload Relay Thermal Overload Relay

+(P ) - (N) + ( P ) - ( N ) B1 + ( P ) - ( N ) B1
VFDB O.L. VFDB O.L.
VFD 4045 4045
Series Braking Braking
Unit Unit
VFD750_43_ SLAVE
MASTER B2 B2
M1 M2 Braking S1 S2 Braking
Resistor Resistor

VFD750_43_ uses with two VFDB4045 braking units, and each braking unit uses with two
BR sets in parallel, which 4PCS BR1K2W6P8 braking resistors in series.

12 DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED

 Document Update
CHAPTER 8 ALL BRAKING RESISTORS & BRAKING UNITS USE IN AC DRIVES

AC Drive Braking Unit Discharged Resistor

Typical
Braking Thermal
Equivalent

Numbers

Numbers
Applicable Model Resistor Model Torque Overload
Voltage

Resistors
Motor Number- Specification for Number- 10%ED Relay
Specification for
KW(HP) VFDB a Resistor BR Value
Each Braking Unit

11(15) 2015 1 1200W 6.8Ω 2 1K2W6P8 2400W 13.6Ω 125 20A

15(20) 2015 1 1500W 5Ω 2 1K5W005 3000W 10Ω 125 30A

18.5(25) 2022 1 1200W 8Ω 4 1K2W008 4800W 8Ω 125 35A

230V

22(30) 2022 1 1200W 6.8Ω 4 1K2W6P8 4800W 6.8Ω 125 40A

30(40) 2015 2 1500W 5Ω 4 1K5W005 3000W 10Ω 125 30A

37(50) 2015 2 1500W 5Ω 4 1K5W005 3000W 10Ω 100 30A

45(60) 2022 2 1200W 6.8Ω 8 1K2W6P8 4800W 6.8Ω 120 30A

11(15) 4030 1 1000W 50Ω 1 1K0W050 1000W 50Ω 135 10A

15(20) 4030 1 1500W 40Ω 1 1K5W040 1500W 40Ω 125 15A

18.5(25) 4030 1 1200W 8Ω 4 1K2W008 4800W 32Ω 125 15A

22(30) 4030 1 1200W 6.8Ω 4 1K2W6P8 4800W 27.2Ω 125 20A

460V

30(40) 4030 1 1500W 5Ω 4 1K5W005 6000W 20Ω 125 30A

37(50) 4045 1 1200W 8Ω 8 1K2W008 9600W 16Ω 125 40A

45(60) 4045 1 1200W 6.8Ω 8 1K2W6P8 9600W 13.6Ω 125 50A

55(75) 4030 2 1500W 5Ω 8 1K5W005 6000W 20Ω 125 30A

75(100) 4045 2 1200W 6.8Ω 16 1K2W6P8 9600W 13.6Ω 125 50A

1
CHAPTER 9 WIRING EXAMPLES OF BRAKING RESISTORS
NOTE: Before wiring, please notice equivalent resistors value shown in the column
“Equivalent resistors specification for each braking unit” in the previous page
to avoid damage.
1. For 230V 15HP/20HP:
Thermal Overload
Relay
B1
+( P ) +(P )
VFD O.L.
Series - ( N ) -( N)
VFDB
2015 Braking
VFD110_23_ Resistor
Braking
VFD150_23_ Unit
B2
VFD110_23_ uses with 2PCS BR1K2W6P8 braking resistors in series
VFD150_23_ uses with 2PCS BR1K5W005 braking resistors in series

2. For 230V 25HP/30HP :

Thermal Overload
Relay
B1
+ (P ) + (P )
O.L.
VFD VFDB
-( N) - ( N ) 2022
Series Braking
Braking Resistor
Unit
VFD185_23_
VFD220_23_
B2
VFD185_23_ uses with two BR sets in parallel, which 2PCS BR1K2W008 braking resistors
in series for each BR set.
VFD220_23_ uses with two BR sets in parallel, which 2PCS BR1K2W6P8 braking resistors
in series for each BR set.

3. For 230V 40HP/50HP:

Thermal Overload Relay
Thermal Overload Relay
+(P ) - (N) + ( P ) - ( N ) B1 + ( P ) - ( N ) B1
VFDB O.L. VFDB O.L.
VFD 2015 2015
Series Braking Braking
Unit Unit
VFD300_23_ SLAVE
VFD370_23_ MASTER
B2 B2
M1 M2 Braking S1 S2 Braking
Resistor Resistor

VFD300_23_ / VFD370_23_ use with two VFDB2015 braking units, and each braking
unit uses with 2PCS BR1K5W005 braking resistors in series.
2
4. For 230V 60HP:

Thermal Overload Relay Thermal Overload Relay

+ (P ) - (N ) + ( P ) - ( N ) B1 + ( P ) - ( N ) B1
VFDB O.L. VFDB O.L.
VFD 2022 2022
Series Braking Braking
Unit Unit
VFD450_23_ SLAVE
MASTER B2 B2
M1 M2 Braking S1 S2 Braking
Resistor Resistor

VFD450_23_ uses with two VFDB2022 braking units, and each braking unit uses with two
BR sets in parallel, which 2PCS BR1K2W6P8 braking resistors in series.

5. For 460V 15HP/20HP:

Thermal Overload
Relay
B1
+(P ) +(P )
O.L.
VFD VFDB
- (N) -( N)
Series 4030
Braking
VFD110_43_ Unit
VFD150_43_ Braking
Resistor
B2
VFD110_43_ uses with 1PCS BR1K0W050 braking resistor
VFD150_43_ uses with 1PCS BR1K5W040 braking resistor

6. For 460V 25HP/30HP/40HP:

Thermal Overload
Relay
B1
+(P ) +(P )
O.L.
VFD VFDB
-( N) - ( N ) 4030
Series
Braking
Unit Braking
VFD185_43_ Unit
VFD220_43_
VFD300_43_ B2
VFD185_43_ uses with 4PCS BR1K2W008 braking resistors in series
VFD220_43_ uses with 4PCS BR1K2W6P8 braking resistors in series
VFD300_43_ uses with 4PCS BR1K5W005 braking resistors in series

3
7. For 460V 50HP/60HP:
Thermal Overload
Relay
B1
+(P ) +(P )
O.L.
VFD
-(N) -(N)
Series
VFDB
4045 Braking
VFD370_43_ Resistor
Braking
VFD450_43_ Unit
B2
VFD370_43_ uses with two BR sets in parallel, which 4PCS BR1K2W008 braking resistors in series
for each BR set.
VFD450_43_ uses with two BR sets in parallel, which 4PCS BR1K2W6P8 braking resistors in series
for each BR set.

8. For 460V 75HP:

Thermal Overload Relay
Thermal Overload Relay
+(P ) - (N) + ( P ) - ( N ) B1 +(P ) - (N) B1
VFDB O.L. VFDB O.L.
VFD 4030 4030
Series Braking Braking
Unit Unit
VFD550_43_ SLAVE
MASTER
B2 B2
M1 M2 S1 S2
Braking Resistor Braking Resistor

VFD550_43_ uses with two VFDB4030 braking units, and each braking unit uses with
4PCS BR1K5W005 braking resistors in series.
9. For 460V 100HP:

Thermal Overload Relay Thermal Overload Relay

+(P ) - (N) + ( P ) - ( N ) B1 + ( P ) - ( N ) B1
VFDB O.L. VFDB O.L.
VFD 4045 4045
Series Braking Braking
Unit Unit
VFD750_43_ SLAVE
MASTER B2 B2
M1 M2 Braking S1 S2 Braking
Resistor Resistor

VFD750_43_ uses with two VFDB4045 braking units, and each braking unit uses with two
BR sets in parallel, which 4PCS BR1K2W6P8 braking resistors in series.