Fuji Electric frenic mini series, User Manual

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9.2 Details of Function Codes
9-27
Chap. 9
FUNCTI
ON C
O
DE
S
Calculating discharging capability and allowable loss and then setting function code
data
Discharging capability (F50)
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
(kW) city Motor Capa (s)×Rated me Braking Ti
= (kWs) lity ing Capabi Disch arg
(1)
(kW) Capacity Motor Rated × (s) Time Braking = (kWs) Capability g Dischargin
(2)
Set F50 to: To do this
0 For built-in braking resistors
1 to 900 Discharge 1 to 900 kWs
999 Disable electronic thermal protective function
Allowable loss (F51)
Allowable 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
(kW) Capacity Motor ×Rated
100
(%) %ED
= (kW) Loss Allowable
(3)
(kW) Capacity Motor Rated ×
100
(%) %ED
= (kW) Loss Allowable
(4)
Set F51 to: To do this:
0 For built-in braking resistors
0.001 to 50.000 Discharge 0.001 to 50.000 kW