9-46
Calculating the discharging capability and allowable average loss of the
braking resistor and configuring the function code data
When using a braking resistor other than the ones listed in the above table, calculate data to be
set to function codes according to the tables and expressions.
Discharging capability (F50)
The discharging capability refers to kWs allowable for a single braking cycle, which is
obtained by the following expressions "(1) Regeneration power during deceleration" and "(2)
Regeneration power at a constant speed," based on the braking time and motor rating.
Data for F50 Function
OFF
Disable the electronic thermal overload protection.
(This setting is equivalent to "999" in the FRNC1-.)
1 to 900 1 to 900 (kWs)
During deceleration:
Braking time (s) × Motor rating (kW)
Discharging capacity (kWs) =
2
(1)
At a constant speed:
Discharging capacity (kWs) = Braking time (s) × Motor rating (kW) (2)
Allowable average loss (F51)
The allowable average loss refers to a tolerance for motor continuous operation, which is
obtained by the following expressions "(3) Regeneration power during deceleration" and "(4)
Regeneration power at a constant speed," based on the %ED (%) and motor rating (kW).
Data for F51 Function
0.001 to 50.000 0.001 to 50.000 (kW)
During deceleration:
%ED (%)
100
× Motor rating (kW)
Allowable average loss (kW) =
2
(3)
At a constant speed:
%ED (%)
Allowable average loss (kW) =
100
× Motor rating (kW)
(4)
When the motor decelerates, apply expressions (1) and (3), and when it runs at a constant
speed, expressions (2) and (4). The obtained data differs depending upon the motor’s running
state.
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