Precautions For Use - IMO Jaguar CUB Instruction Manual

Precautions for use

Driving a 400V
general-purpose
motor
Torque charac-
teristics and tem-
perature rise
In running
general-
purpose
motors
Vibration
Noise
High-speed mo-
tors
Explosion-proof
motors
In running
Submersible mo-
special mo-
tors and pumps
tors
Brake motors
When driving a 400V general-purpose motor with an inverter
using extremely long wires, damage to the insulation of the
motor may occur. Use an output circuit filter (OFL) if neces-
sary after checking with the motor manufacturer.
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. If constant torque is required in
the low-speed range, use an inverter rated motor or a motor
equipped with an externally powered ventilating fan.
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 abnormal vibration.
* The use of a rubber coupling or vibration dampening rubber
is recommended.
* Use the inverter's jump frequency control feature to skip
the resonance frequency zone(s).
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 in-
verter. Operation at 60 Hz or higher can also result in higher
noise level.
If the set frequency is set to 120 Hz or more to drive a
high-speed motor, test-run the combination of the inverter
and motor beforehand to check for safe operation.
When driving an explosion-proof motor with an inverter, use a
combination of a motor and an inverter that has been ap-
proved in advance.
These motors have a larger rated current than gen-
eral-purpose motors. Select an inverter whose rated output
current is greater than that of the motor.
These motors differ from general-purpose motors in thermal
characteristics. Set a low value in the thermal time constant
of the motor when setting the electronic thermal function.
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 power output
circuit by mistake, the brake will not work.
Do not use inverters for driving motors equipped with se-
ries-connected brakes.
x