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CAUTION
Instructions for safe and correct operation
1.
The capacity of the power source must be in the range 1.5 times the inverter capacity to 500
kVA. If the power source has 500 kVA or higher capacity and the length of the cable
between it and the inverter is 100 m or less, or if the power source has a phase advancing
capacitor selector, excessive peak current will flow into the power source input circuit and
may damage the converter. If this is the case, install power factor improvement AC reactor
at the input of each inverter.
2. Do not connect the phase advancing capacitor to the inverter output. Otherwise, the
capacitor may be damaged.
3.
Do not install an electromagnetic contactor between the inverter and motor. Run/stop the
motor from inverter operation panel using the RUN switch or control input terminal. Do not
operate the electromagnetic contactor installed on the power source more often than
actually required.
In particular, never attempt to start or stop the motor with this electromagnetic contactor.
4.
Operating the motor through the inverter increases leakage current that may trip the leakage
breaker. If this is the case, use leakage breaker of high frequency proof type (designed for
use with inverter) on both the system causing the problem and system affected.
5.
The total cable length of the inverter and motor must be shorter than 30 m. To use a cable
longer than 30 m, provide a reactor between the inverter and the motor, or reduce the
inverter’s carrier frequency.
Inverter
↔
motor cable length
Up to 30 m
Up to 50 m
Up to 100 m
[
Carrier frequency]
0 to 7
(14.9 kHz or less)
0 to 5
(10.1 kHz or less)
0 to 2
(3.9 kHz or less)
6.
To use the electronic thermal trip function incorporated in the inverter, observe the following
instructions.
•
Check the rated current of your 3-phase induction motor to define the electric thermal
value.
•
Use one motor for each inverter.
7. To control several motors with an inverter (parallel operation), select the inverter’s capacity
so that the total of the motors’ rated currents does not exceed the inverter’s rated current.
Note that, if you select the inverter’s capacity based on the total of the motors’ capacity, the
inverter’s rated current may be exceeded depending on the motor type.
