FujiFilm FRENIC5000G11S Series, Technical Information

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Chapter 4
1. Inverter and Motor Selection
4-2
1. Inverter and Motor Selection
When selecting a general-purpose inverter, select a motor
first and next inverter.
(1) To select a motor, determine what kind of load machine is
used, calculate the moment of inertia, and then select an
appropriate motor capacity.
(2) To select an inverter, consider in what operating conditions
(acceleration time, deceleration time, or frequency in
operation) the mechanical system is used for the motor
capacity selected in (1), and calculate acceleration torque,
deceleration torque, and braking torque.
Here, the selection procedure for the above (1) and (2) is
described. First, explained is the output torque obtained by
using the inverter FRENIC5000G11S/P11S.
◆
Motor output torque characteristics
(See Section 1.1)
Torque characteristics (continuous output torque, output
torque in a short time, braking torque) obtained when
frequency control is made by inverter, are described for the
whole range of speed control using figures.
◆
Selection procedure (See Section 1.2 and 1.3)
1 Selection procedure: Explained using a flowchart.
2 Selection calculation expressions: Calculation method
shown in the selection flowchart is explained with calcula-
tion expressions.
1.1 Motor output torque characteristics
Fig. 4.1 and 4.2 show the output torque characteristics
individually according to 50Hz and 60Hz base for the rated
output frequency.
(c)
(a)
(b)
(d)
(e)
(f)
50 60
–250
–200
–150
–100
–50
0
50
100
150
180
200
250
Output frequency
[Hz]
Output torque [%]
Fig. 4.1 Output torque characteristics (50Hz base)