9-32
Calculating discharging capability and allowable average loss and then setting function
code data
Discharging capability (F50)㩷㩷
Discharging capability stands for the amount of electric power that a braking resistor can
discharge for a single cycle of braking operation. It can be calculated using the braking period
and rated motor capacity using equation (1), which is based on the regenerative power in
deceleration or equation (2), which is based on that in constant speed operation.
2
(HP)cityMotor Capa(s)×RatedmeBraking Ti
=(kWs)y CapabilitgDischargin
(1)
(HP)CapacityMotorRated×(s)TimeBraking=(kWs)CapabilitygDischargin
(2)
Data for F50 Function
0 Apply the discharging capability specified for braking resistor built-in type
1 to 900 Discharge 1 to 900 kWs
999 Disable electronic thermal overload protection
Allowable average loss (F51)㩷㩷
Allowable average loss is a braking resistor capacity that can be applied for continuos operation
of a motor. It can be calculated from the %ED and rated motor capacity using equation (3),
which is based on the regenerative power in deceleration or equation (4), which is based on that
in constant speed operation.
2
(HP)CapacityMotor×Rated
100
(%)%ED
=(kW)LossAllowable
(3)
(HP)CapacityMotorRated×
100
(%)%ED
=(kW)LossAverageAllowable
(4)
Data for F51 Function
0 Apply the allowable average loss specified for braking resistor built-in type
0.001 to
50.000
Discharge 0.001 to 50.000 HP
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