v
Precautions for use
In running
general-
purpose
motors
Driving a 400V
general-purpose
motor
When driving a 400V general-purpose motor with an inverter using ex-
tremely long wires, damage to the insulation of the motor may occur. Apply
the inverter after consulting the motor maker.
Torque characte-
ristics and tem-
perature rise
When the inverter is used to run a general-purpose motor, the temperature
of the motor becomes higher than when it is operated using a commercial
power supply. In the low-speed range, the cooling effect will be weakened,
so decrease the output torque of the motor.
Vibration
When an inverter-driven motor is mounted to a machine, resonance may
be caused by the natural frequencies of the machine system.
Note that operation of a 2-pole motor at 60 Hz or higher may cause ab-
normal vibration.
* The use of a rubber coupling or vibration dampening rubber is recom-
mended.
* Run your machinery including FRENIC-Lift inverter so as to skip its re-
sonance frequency zone/s.
Noise
When an inverter is used with a general-purpose motor, the motor noise
level is higher than that with a commercial power supply. To reduce noise,
raise carrier frequency of the inverter. Operation at 60 Hz or higher can
also result in higher noise level.
In running
special mo-
tors
Brake motors
For motors equipped with parallel-connected brakes, their braking power
must be supplied from the primary circuit. If the brake power is connected
to the inverter's output circuit by mistake, the brake will not work.
Do not use inverters for driving motors equipped with series-connected
brakes.
Geared motors
If the power transmission mechanism uses an oil-lubricated gearbox or
speed changer/reducer, then continuous motor operation at low speed
may cause poor lubrication. Avoid such operation.
Synchronous mo-
tors
The PG interface card (option) corresponding to the pulse encoder spec-
fication is necessary. Read PG interface card (option) manual.
Single-phase
motors
Single-phase motors are not suitable for inverter-driven variable speed
operation. Use three-phase motors.
Environ-
mental con-
ditions
Installation loca-
tion
Use the inverter within the ambient temperature range from -10 to +45°C.
The heat sink and braking resistor of the inverter may become hot under
certain operating conditions, so install the inverter on nonflammable ma-
terial such as metal.
Ensure that the installation location meets the environmental conditions
specified in Chapter 2, Section 2.1 "Operating Environment."
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