Precautions for Peripheral Device Selection
Installation and selection of moulded case circuit breaker
Install a moulded case circuit breaker (MCCB) on the power receiving side to protect the wiring of the inverter primary side. For MCCB selection, refer to page 57 since it depends on the inverter power supply side power factor (which changes depending on the power supply voltage, output frequency and load). Note that the operation characteristics of the completely electromagnetic MCCB changes according to the higher harmonic current, so a larger capacity must be selected. (Check it in the data of the corresponding breaker.) As an earth (ground) leakage breaker, use the Mitsubishi earth (ground) leakage breaker designed for harmonics and surges. (Refer to page 58.)
When installing a moulded case circuit breaker on the secondary side of the inverter, contact each manufacturer for selection of the moulded case circuit breaker.
Handling of primary side magnetic contactor
For operation via external terminal (terminal STF or STR used), provide a primary side MC to prevent an accident caused by a natural restart at power recovery after a power failure, such as an instantaneous power failure, and to ensure safety for maintenance work. Do not use this magnetic contactor to make frequent starts and stops. (The switching life of the inverter input circuit is about 1,000,000 times.) For parameter unit operation, an automatic restart after power failure is not made and the MC cannot be used to make a start. Note that the primary side MC can stop the operation, but the regenerative brake specific to the inverter does not operate and the motor coasts to stop.
Handling of secondary side magnetic contactor
Switch the magnetic contactor between the inverter and motor only when both the inverter and motor are at a stop. When the magnetic contactor is turned on while the inverter is operating, overcurrent protection of the inverter and such will activate. When an MC is provided to switch to a commercial power supply, for example, it is recommended to use commercial power
Thermal relay installation
The inverter has an electronic thermal relay function to protect the motor from overheating. However, when running multiple motors with one inverter or operating a
For
Secondary side measuring instrument
When the wiring length between the inverter and motor is long, select the device that has enough current rating. Otherwise the measuring instrument or CT which is used especially for the 400V class
Disuse of power factor improving capacitor (power capacitor)
The power factor improving capacitor and surge suppressor on the inverter output side may be overheated or damaged by the harmonic components of the inverter output. Also, since an excessive current flows in the inverter to activate overcurrent protection, do not install a capacitor or surge suppressor. For power factor improvement, use the power factor improving DC reactor (see page 51).
Wire thickness and wiring distance
When the wiring length between the inverter and motor is long, use thick wires so that the voltage drop of the main circuit cable is 2% or less especially at low frequency output. (A selection example for the wiring distance of 20m is shown on page 57)
Especially at a long wiring distance, the maximum wiring length should be within 500m since the overcurrent protection function may be misactivated by the influence of a charging current due to the stray capacitances of the wiring. (The overall wiring length for connection of multiple motors should be within the value in the table below.)
Pr. 72 PWM frequency |
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selection setting | 0.75K | 1.5K | 2.2K or more |
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2 | 300m | 500m | 500m |
3 to 15 | 200m | 300m | 500m |
Use the recommended connection cable when installing the operation panel away from the inverter unit or when connecting the parameter unit.
For remote operation via analog signal, wire the control cable between the operation box or operation signal and inverter within 30m and away from the power circuits (main circuit and relay sequence circuit) to prevent induction from other devices.
When using the external potentiometer instead of the parameter unit to set the frequency, use a shielded or twisted cable, and do not earth (ground) the shield, but connect it to terminal 5 as shown below.
(3) |
| 10 (10E) |
(2) |
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(1) |
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Frequency setting | Twisted cable | 5 |
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potentiometer
(3)Shielded cable
10 (10E)
(2)
2
(1)
5
Frequency setting potentiometer
Earth (Ground)
When the inverter is run in the low acoustic noise mode, more leakage currents occur than in the
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Peripheral Devices | Why energy | savings? | |||
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| Standard | Specifications |
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Outline | Dimension | Drawings | |||
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Terminal Connection | Diagram | Terminal Specification | Explanation | ||
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| Parameter | List |
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Explanations | of | Parameters | |||
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| Options |
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| Instructions |
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| Compatibility |
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