External Braking Resistors
Standard models
The thermal sensor relay mounted on the braking resistor acts as a thermal protector of the
motor for overheat, so assign an "Enable external alarm trip" terminal command
THR
to any of
digital input terminals [X1] to [X3], [FWD] and [REV] and connect that terminal and its common
terminal to braking resistor's terminals 2 and 1.
To protect the motor from overheat without using the thermal sensor relay mounted on the
braking resistor, configure the electronic thermal overload protection facility by setting F50
and F51 data to the discharging capability and allowable average loss values listed below,
respectively.
Power
supply
voltage
Inverter type
Braking resistor
Resistance
(
Ω
)
Continuous braking
(100% braking torque)
Intermittent braking
(Period: 100 s or less)
Type
Qty.
Discharging
capability
(kWs)
Braking
time (s)
Allowable
average loss
(kW)
Duty
(%ED)
Three-
phase
400 V
FVR0.4AS1S-4
DB0.75-4
1
200
9
45
0.044
22
FVR0.75AS1S-4
17
0.068
18
FVR1.5AS1S-4
DB2.2-4
160
34
0.075
10
FVR2.2AS1S-4
33
30
0.077
7
FVR3.7AS1S-4
DB3.7-4
130
37
20
0.093
5
Single-
phase
200 V
FVR0.4AS1S-7
DB0.75-2
100
9
45
0.044
22
FVR0.75AS1S-7
17
0.068
18
FVR1.5AS1S-7
DB2.2-2
40
34
0.075
10
FVR2.2AS1S-7
33
30
0.077
7
Compact models
When using the compact models of braking resistor TK80W120
Ω
or TK80W100
Ω
, set F50 to
"7" and F51 to "0.033."
10% ED models
Power
supply
voltage
Inverter type
Braking resistor
Resistance
(
Ω
)
Continuous braking
(100% braking torque)
Intermittent braking
(Period: 100 s or less)
Type
Qty.
Discharging
capacity
(kWs)
Braking
time (s)
Allowable
average
loss (kW)
Duty
(%ED)
Three-
phase
400 V
FVR0.4AS1S-4
DB0.75-4C
1
200
50
250
0.075
37
FVR0.75AS1S-4
133
20
FVR1.5AS1S-4
DB2.2-4C
160
55
73
0.110
14
FVR2.2AS1S-4
50
10
FVR3.7AS1S-4
DB3.7-4C
130
140
75
0.185
Single-
phase
200 V
FVR0.4AS1S-7
DB0.75-2C
100
50
250
0.075
37
FVR0.75AS1S-7
133
20
FVR1.5AS1S-7
DB2.2-2C
40
55
73
0.110
14
FVR2.2AS1S-7
50
10
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