9-44
F50
Electronic Thermal Overload Protection for Braking Resistor
(Discharging capability)
F51
Electronic Thermal Overload Protection for Braking Resistor
(Allowable average loss)
A braking resistor can be mounted on inverters of 0.4 kW (1/2 HP) or above.
These function codes specify the electronic thermal overload protection feature for the
braking resistor.
Set F50 and F51 data to the discharging capability and allowable average loss, respectively.
Those values differ depending on the specifications of the braking resistor, as listed on the
following pages.
Depending on the thermal marginal characteristics of the braking resistor, the
electronic thermal overload protection feature may act so that the inverter issues the
overheat protection alarm
dbh
even if the actual temperature rise is not large
enough. If it happens, review the relationship between the performance index of the
braking resistor and settings of related function codes.
The tables below list the discharging capability and allowable average loss of the braking
resistor. These values depend upon the inverter and braking resistor models.
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.
Braking resistor
Continuous braking
(100% braking torque)
Intermittent braking
(Period: 100 s or less)
Power
supply
voltage
Inverter type
Type
Qty.
Resistance
(Ω)
Discharging
capability
(kWs)
Braking
time
(s)
Allowable
average
loss (kW)
Duty
(%ED)
FRN0004C2S-2 9 0.044 22
FRN0006C2S-2
DB0.75-2 100
17 0.068 18
FRN0010C2S-2 34
45
0.075 10
FRN0012C2S-2
DB2.2-2 40
33 30 0.077 7
FRN0020C2S-2 DB3.7-2 33 37 0.093
FRN0025C2S-2 DB5.5-2 20 55
20
0.138
FRN0033C2S-2 DB7.5-2 15 37 0.188
FRN0047C2S-2 DB11-2 10 55 0.275
Three-
phase
200 V
FRN0060C2S-2 DB15-2 8.6 75
10
0.375
5
FRN0002C2-4 9 0.044 22
FRN0004C2-4
DB0.75-4 200
17 0.068 18
FRN0005C2-4 34
45
0.075 10
FRN0007C2-4
DB2.2-4 160
33 30 0.077 7
FRN0011C2-4 DB3.7-4 130 37 0.093
FRN0013C2-4 DB5.5-4 80 55
20
0.138
FRN0018C2-4 DB7.5-4 60 38 0.188
FRN0024C2-4 DB11-4 40 55 0.275
Three-
phase
400 V
FRN0030C2-4 DB15-4
1
34.4 75
10
0.375
5
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