MT-BU5 Brake Unit and MT-BR5 Brake Resistor
Use MT-BU5 Brake Unit and MT-BR5 brake resistor in combination with Mitsubishi FREQROL-A500L
series general-purpose inverter. The combination of these units will consume the regenerative energy
of the motor thermally, and as a result, the motor braking capability will be enhanced. If your machine
needs a large braking torque to prevent the motor from being unnecessarily rotated by the load or to
reduce speed immediately, Please use our brake unit and resistor.
■Features
1. Greatly upgraded braking capability
The brake unit and resistor ensure excellent braking capability even during frequent use of the
brake. This is because the allowable operation rate (% ED) for a rated short-time operation is very
large (10% ED at 100% torque) when the motor has the same capacity as the brake unit.
2. Various capacities
There are various types of the brake units and re-resistors, such as 75k to 375k brake units and
resistors for a rated power supply of 400V.
3. Easy wiring
Wiring is very easy because the cables necessary to connect the brake unit to the inverter unit are
already connected to the brake unit before shipment.
4. Easy operation
The monitor function of the inverter unit enables you to check the brake operation rate during
operation.
■Specifications
Brake Unit
Brake Resistor
Resistor
DC input voltage
(Note.1)
−
(Note.1)
−
(Note.1)
−
(Note.1)
−
−
−
MT-BU5-H75K
MT-BU5-H150K
MT-BU5-H220K
MT-BU5-H280K
MT-BU5-H375K
1×MT-BR5-H75K
2×MT-BR5-H75K
3×MT-BR5-H75K
4×MT-BR5-H75K
5×MT-BR5-H75K
6.5 Ω
6.5 Ω/2P
6.5 Ω/3P
6.5 Ω/4P
6.5 Ω/5P
200V Type
Less than 400V DC
400V Type
Less than 800V DC
The braking torque and operation rate (% ED)depends on the capacity of the motor which is combined with the
brake unit.
Braking torque
The braking torque depends on the capacity of the motor which is combined with the brake unit and the rated
time (short or continuous time).
Operation rate(% ED)
The rated time depends on the capacity of the motor which is combined with the brake unit and on the braking
torque.
Applicable control unit
Mitsubishi general-purpose FR-A500L series inverters.
Output signal
Resistor overheat (1a) The brake resistor mounts the output signal.
Protective function
Fin and resistor overheat preventive functions
Display
Braking torque operation rate (%ED) and fault (displayed on the inverter unit main body)
Ambient conditions
Capacity of applicable
motor
Ambient temperature
-10ºC∼+50ºC
Ambient humldlty
90% RH or less
Storage temperature
-20ºC∼+65ºC
Ambient atmosphere
Indoors: No corrosive gas, oil mist, flammable gas, dust, or dirt
Altitude and vibration
1,000m above sea level or less, 5.9m/s (.06G) or less (in accordance with JIS C0911)
2
Protective structure
(JEM1030)
Open type (IP00)
Cooling method
Forced air cooling
(Note.1) Development stages.
(Note.2) Select the optimum brake unit and brake unit and brake resistor by referring to the combination table.
1
■Outline Dimensions
Brake unit
P and PR terminals
N×M6 set screw
4-7×10 hole
Brake unit model
AB
B
BA
C
LC
LP
LN
N
Approx.
weight
X
Y
102
85
200
100
256.5
-
-
-
1
1.5
-
-
172
155
200
100
256.5
-
-
-
2
3.0
-
-
102
90
200
100
256.5
550
1740
1740
1
1.5
14
12
172
160
200
100
256.5
550
2000
2000
2
3.0
22
12
258
242
230
200
100
256.5
550
2000
2000
3
4.5
38
12
328
312
300
200
100
256.5
550
2330
2330
4
6.0
60
12
398
382
370
200
100
256.5
550
2330
2330
5
7.5
60
12
A
AA
-
118
-
188
MT-BU5-H75K
118
MT-BU5-H150K
188
MT-BU5-H220K
MT-BU5-H280K
MT-BU5-H375K
200V
400V
Brake resistor
(Note1) Install the brake resistor in a well-ventilated
area, If the resistor brake is installed in
uneasily-heated area, such as inside the
panel, be sure to ventilate the inside of the
panel.
(Note2) The brake resistor temperature rises to
300deg. Therefore connect the cables
carefully so that no cables come into
contact with the resistor. Keep parts not
resistant to heat 40 to 50 cm away from
the resistor.
(Note3) If the operation rate of the brake unit
exceeds the specified value, the resistor
temperature will rise excessively. If this
occurs turn off the input power of the
inverter to protect the brake resistor from
overheating.
4-φ 15
Mounting hole
※The resistor is equipped with an
overheating prevention thermostat (acontact).
If the thermostat is activated during
normal operation, the inverter slow-down
time will be too short. Prolong the set slowdown time.
Base
Brake unit model
A
AA
B
BA
C
CA
CB
200V
-
-
-
-
-
-
-
-
400V
MT-BR5-H75K
510
480
885
800
465
450
300
2
Resistor Weight
-
-
6.5 Ω 70 ㎏
■Terminals
Brake unit
Terminal
P
PR
Terminal name
Rating
Description
Brake resistor
terminal set
-
This is the terminal to connect to the brake resistor. Some brake
unit have two or more brake resistor terminal sets to that two or
more resistors can be connected to the brake unit.
Brake unit input
terminal
-
This is the cable to connect the P and N terminals of inverter.
The connection cables are supplied with the brake unit.
Brake unit drive
terminal
-
This is the brake unit control signal.
Main circuit
P/+
N/GBR
EBR
Control
circuit
This is an output signal that indicates that the brake unit is
overheated.
THBP
THBN
Abnormal output
detection terminal
-
Terminal name
Rating
Brake resistor input
terminal set
-
Abnormal output
detection terminal
1a contact
AC110V 5A
AC220V 3A
※The cable for transmission of these control signals is supplied
with the brake unit.
Brake resistor
Terminal
P
Main circuit
PR
TH1
Control
circuit
TH2
Description
This is the cable to connect the P and PR terminals of brake
unit.
This is an output signal that indicates that the resistor is
overheated.
Cable size
Brake unit model
Brake resistor model
Cable (P-P, PR-PR)
-
-
-
-
MT-BU5-H75K
MT-BR5-H75K
MT-BU5-H150K
2×MT-BR5-H75K
2×14mm
MT-BUR-H220K
3×MT-BR5-H75K
3×14mm
MT-BU5-H280K
4×MT-BR5-H75K
4×14mm
MT-BU5-H375K
5×MT-BR5-H75K
5×14mm
200V
400V
2
14mm
2
2
2
Be sure to use the cables of the above recommended sizes or above.
3
2
■Example of External Writing
※10m for twist
5m or less for non-twist
CN8
Brake unit
MT-BU5
Brake resistor
MT-BR5
(Note1) When connecting the brake unit to the inverter unit, be sure to use the electric cables supplied with the
brake unit.
(Note2) The main circuit wire is connected to the P and N terminals, and the control circuit wire is connected to
the internal LL connector (CN8) after placing slits on the rubber bushing on the top of the inverter.
(Note3) The brake unit that uses multiple brake resistors has the same number of terminals as the brake resistor
unit. Connect the one brake resistor to one set of terminals (P, PR).
■Selection
[Application to inverter]
(1) Select the brake unit appropriate for the motor capacity.
(2) Even if an inverter 1-rank larger in capacity is used, the braking torque and operation rate(% ED) should be
as follows:
・% ED at 100% braking torque during rated short-time operation
Motor capacity
Inverter
Brake Unit
200V
400V
MT-BU5-55K
37kW
55kW
75kW
90kW
110kW
150kW
160kW
220kW
280kW
200V
75k
75k
75k
90k
110k
-
-
-
-
375kW
-
400V
75k
75k
75k
110k
110k
150k
160k
220k
280k
375k
20
10
-
-
-
-
-
-
-
-
85
40
20
15
10
-
-
-
-
-
MT-BU5-H75K
40
15
10
-
-
-
-
-
-
-
MT-BU5-H150K
-
70
40
25
15
10
-
-
-
-
-
-
85
55
40
20
15
10
-
-
MT-BU5-H280K
-
-
-
95
60
30
30
15
10
-
MT-BU5-H375K
-
-
-
-
-
60
50
25
15
10
375kW
MT-BU5-110K
MT-BU5-H220K
%ED
%ED
・Braking torque (%) at 10% 15sec ED during rated short-time operation
Motor capacity
37kW
55kW
75kW
90kW
110kW
150kW
160kW
220kW
280kW
200V
75k
75k
75k
90k
110k
-
-
-
-
-
400V
75k
75k
75k
110k
110k
150k
160k
220k
280k
280k
Braking
torque
(%)
145
100
70
60
50
-
-
-
-
-
290
200
145
120
100
-
-
-
-
-
MT-BU5-H75K
200
135
100
80
65
50
45
30
25
20
MT-BU5-H150K
-
270
200
165
135
100
90
65
50
40
-
-
290
240
200
145
135
100
75
55
-
-
-
300
250
185
175
125
100
70
-
-
-
-
300
250
230
170
130
100
Inverter
Brake Unit
200V
400V
MT-BU5-55K
MT-BU5-110K
MT-BU5-H220K
MT-BU5-H280K
MT-BU5-H375K
Braking
torque
(%)
※To obtain large braking torque, the motor should have optimum torque characteristics. Check the
torque characteristics of the motor.
4
■Allowable Continuous Power
Allowable continuous power for brake unit MT-BR5
Model
Allowable continuous power : WRC[kW]
200V
Development stages
-
400V
MT-BR5-H75K
7.5
5
■Braking Torque
6
■Operation
Connecting the brake unit
Remove the inverter unit's cover, and connect the cable with the brake resistor to the brake unit
terminals P and PR. Connect the main circuit cable enclosed with the brake unit to the inverter
unit's P and N terminals, and connect the control circuit cable to the LL connector CN8 on the
upper left of the inverter.
※The rubber bushing must be cut, so take special care to safety.
Setting parameters for inverter unit
Set the parameters for the inverter unit before starting the brake unit.
Pr.31 (Factory-set value : "0")
0:
Pr.7※Set the parameters for inverter unit by referring to the setting table.
0:
(Factory-set value : 0%)
Setting parameters for brake unit
(1) Setting parameters for display of brake unit operation rate (Pr.52 to Pr.54 and Pr.158)
These parameters select the monitor and output signal function of the inverter unit so that DU,
PU, and meter can display the brake unit operation rate.
(2) Setting parameters for output of brake unit pre-alarm signal (Pr.190 to Pr.195)
The output terminal of the inverter unit will out-put a pre-alarm signal when the regenerative
brake operation rate is 85% (detected setting Pr.70).
(3) Brake circuit fault
If the brake unit overheats, the inverter will be stopped due to a "brake circuit fault", and DU
and PU will display the main circuit fault "E.15".
7
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