(Dcrs) - FujiFilm Frenic-Mini Instruction Manual

Name of option
Braking resistors A braking resistor converts regenerative
(Standard model) deceleration of the motor and converts it to heat for consumption. Use of a
(DBRs) braking resistor results in improved deceleration performance of the
inverter.
DC reactors A DCR is mainly used for power supply normalization and for supplied
power-factor reformation (for reducing harmonic components).

(DCRs)

1) For power supply normalization
2) For supplied power-factor reformation (harmonic component reduction)
Note:
terminals P1 and P (+) on the terminal block. Remove the jumper bar when
connecting a DCR.
Output circuit filters Include an OFL in the inverter power output circuit to:
(OFLs)
1) Suppress the voltage fluctuation at the motor input terminals
2) Suppress leakage current from the power output lines (due to harmonic
3) Minimize emission and/or induction noise issued from the power feed
Note: Use an OFL within the allowable carrier frequency range specified
by function code F26. Otherwise, the filter will overheat.
Function and application
- Use a DCR when the capacity of a power supply transformer
exceeds 500 kVA and is 10 times or more the rated inverter capacity.
In this case, the percentage-reactance of the power source
decreases, and harmonic components and their peak levels
increase. These factors may break rectifiers or capacitors in the
converter section of inverter, or decrease the capacitance of the
capacitor (which can shorten the inverter's service life).
- Also use a DCR when there are thyristor-driven loads or when
condensive capacitors are being turned on/off.
- Use a DCR when the interphase voltage unbalance ratio of the
inverter power source exceeds 2%.
Interphase voltage unbalance
Generally a capacitor is used to reform the power factor of the load,
however, it cannot be used in a system that includes an inverter. Using a
DCR increases the reactance of inverter's power source so as to
decrease harmonic components on the power source lines and reform
the power factor of inverter. Using a DCR reforms the input power factor
to approximately 90 to 95%.
At the time of shipping, a jumper bar is connected across the
This protects the motor from insulation damage caused by the
application of high voltage surge currents by the 400 V class of
inverters.
components)
This reduces the leakage current when the motor is hooked by long
power feed lines. It is recommended that the length of the power feed
line be kept to less than 400 m.
lines
OFLs are effective in reducing noise from long power feed lines, such as
those used in plants, etc.
9-3
energy
−
Max. voltage (V) Min.
(%) =
- 3 phase average voltage
generated from
voltage (V)
× 67
(V)