Mitsubishi Electric FR-A700 Manual page 80

Name (type)
Brake unit
MT-BU5-(H) K
Resistor unit
MT-BR5-(H) K
83
The brake unit and resistor unit are options that will fully exhibit the regenerative braking capability of the inverter. Use them as a set.
There are six different brake units as in the following table, from which make selection according to the deceleration time.
When the brake unit duty (%ED) excess and an alarm occur, errors appear in the inverter.
Brake unit selection table
%ED at short-time rating when braking torque is 100%
75 90
Motor Capacity
kW kW
200V 75K 90K 110K
Inverter
400V 75K 90K 110K 132K 160K 185K 220K 280K 375K
MT-BU5-55K 5 --- ---
2
0
%ED
0
V
MT-BU5-110K 20 15
MT-BU5-H75K 10 5
4
MT-BU5-H150K 40 25
0
MT-BU5-H220K %ED 80 60
0
MT-BU5-H280K - -- --- 80
V
MT-BU5-H375K - -- --- --- ---
Braking torque (%) at short-time rating when 100% ED is 15s
75 90
Motor Capacity
kW kW
200V 75K 90K 110K ------ ------ ------ ------ ------ ------
Inverter
400V 75K 90K 110K 132K 160K 185K 220K 280K 375K
2 MT-BU5-55K 70 60
braking
0
torque
0
(%)
V MT-BU5-110K 150 120 100 ------ ------ ------ ------ ------ ------
MT-BU5-H75K 100 80
4
MT-BU5-H150K 150 150 135
braking
0
MT-BU5-H220K torque 150 150 150 150 135
0
(%)
MT-BU5-H280K 150 150 150 150 150 150
V
MT-BU5-H375K 150 150 150 150 150 150
* To obtain a large braking torque, the motor has to have a torque characteristic
that meets the braking torque.
Check the torque characteristic of the motor.
Outline dimension drawings
A
AA
AB
B BA
4 7
Mounting hole L
P
L
C
P
CN8
Brake Unit Type
A AA AB B
MT-BU5-55K 118 102 90 200 100 256.5 550 1740 1740
200V
class
MT-BU5-110K 188 172 160 200 100 256.5 550 2000 2000
MT-BU5-H75K 118 102 90 200 100 256.5 550 1740 1740
MT-BU5-H150K 188 172 160 200 100 256.5 550 2000 2000
400V
MT-BU5-H220K 258 242 230 200 100 256.5 550 2000 2000
class
MT-BU5-H280K 328 312 300 200 100 256.5 550 2330 2330
MT-BU5-H375K 398 382 370 200 100 256.5 550 2330 2330
External connection diagram
MCCB MC
R/L1
Three-phase
AC power
S/L2
supply
T/L3
Inverter
*1 When the power supply is 400V class, install a step-down transformer.
*2 The wiring length between the resistor unit and brake resistor should be 10m maximum when
wires are twisted and 5m maximum when wires are not twisted.
Specifications, Structure, etc.
110 132 160 185 220 280 375
kW kW kW kW kW kW kW
--- --- --- -- - -- --- - -- --- - -- --- - -- --- -
--- --- --- --- --- -- - -- --- - -- --- - -- --- - -- --- -
10 --- --- --- -- - -- --- - -- --- - -- --- - -- --- -
--- --- --- --- --- -- - -- --- - -- --- - -- --- - -- --- -
20 10 5 5 -- --- - -- --- - -- --- -
40 25 15 10 10 5 -- --- -
65 40 30 20 15 10 5
--- --- 80 50 40 20 15 10
110 132 160 185 220 280 375
kW kW kW kW kW kW kW
50 ------ ------ ------ ------ ------ ------
70 55 45 40 35 25 20
110 90 80 70 50 40
115 100 80 55
125 100 70
150 130 100
P, PR terminal
2 M6 screw N
L
N
C
N
X-Y
Approx.
BA C Lc LP LN N
mass
1 1.5
2 3.0
1 1.5
2 3.0
3 4.5
4 6.0
5 7.5
T
*1
ON OFF CR1
Motor
U
V
IM
W MC
5m or *2
less
P
P/+
P
N/
PR
PR
CN8
P
P
PR
PR
Brake unit Resistor unit
MT-BU5 MT-BR5
Brake unit and resistor unit combinations and
cables
Resistor Unit
Brake Unit Type
Type
MT-BU5-55K MT-BR5-55K
200V
MT-BU5-110K 2×MT-BR5-55K
MT-BU5-H75K MT-BR5-H75K
MT-BU5-
2×MT-BR5-H75K
H150K
MT-BU5-
3×MT-BR5-H75K
400V
H220K
MT-BU5-
4×MT-BR5-H75K
H280K
MT-BU5-
5×MT-BR5-H75K
H375K
(Caution 1) Be sure to select the well-ventilated place for installa-
tion of the resistor unit. Ventilation is necessary when
installing the resistor in a place, e.g. enclosure, where
heat is not well diffused.
(Caution 2) The temperature rise of the discharging resistor is
300deg. Therefore, wire the cable so as not to touch
the resistor. In addition, separate the parts with low
heat resistance and the resistor by at least 40 to
50cm.
(Caution 3) The temperature of the resistor unit abnormally
increases if the brake unit is operated exceeding the
specified duty. Since the resistor unit may result in
overheat if the temperature of the brake unit is left
unchanged, switch off the inverter.
* The resistor unit is provided with a thermostat (a contact) as
overheat protection. If this protective device is activated under
normal operation, it is assumed that the deceleration time is too
short. In such a case, increase the deceleration time setting of
the inverter.
NP
TH2
M4
M6
P PR TH1 E
193 189
37 60 10 21
480
510
75 300 75
4 15
7.5 450
Mounting hole
Resistor Unit Resistance
X Y Z
Type
14 12 8
200V
MT-BR5-55K
22 12 8 class
14 12 8 MT-BR5-
400V
class H75K
22 12 8
38 12 8
60 12 10
60 12 10
(Caution 1) For wiring of the brake unit and
inverter, use an accessory cable
supplied with the brake unit.
CR2
Connect the main circuit cable to
the terminals P/+ and N/- and
connect the control circuit cable
to the connector (CN8) inside by
MC
making cuts in the rubber bush
at the top of the inverter.
TH1
CR1
(Caution 2) The brake unit which uses multi-
ple resistor units has terminals
TH2
equal to the number of resistor
units. Connect one resistor unit
TH1
CR2
to one pair of terminals (P, PR).
TH2
Brake unit
Inverter
Cable
2
14mm
2
2×14mm
2
14mm
2
2×14mm
2
3×14mm
2
4×14mm
2
5×14mm
Mass
Value
2.0Ω 50kg
6.5Ω 70kg