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OPTIONS
Reactor, Filter and Other Accessories
Name
Surge arrester
(Contact IMO)
Ferrite ring for reducing
radio noise
(OC1-OC5)
RFI Filter
(RFII I I I
CM)
Optional Sin O/P filter
(Contact IMO)
DC Reactor (DCR)
(VXMLC) (optional for
smaller power ratings)
AC Reactor (ACR)
(LOI I I I I I
-3)
Frequency meter
(X72M10V)
Frequency setting device
(JAGPOT1K)
Rail mounting base
(MAC9)
* Screened motor cable not shown for simplicity
15
Suppresses induced transient surges from power source, thus protecting all
equipment connected to the power supply.
Reduces radio frequency noise. If the wiring between motor and inverter is
shorter than 20m, use the ferrite ring in the power supply side. If longer than
20m, use it in the output side, if required.
This is a special filter which complies with the European EMC (Emission) Directive.
This filter should be used with a screened motor cable.
Note: Other prerequisites must be fulfiled to ensure compliance with EMC Directives.
Refer to IMO for details.
Connected to the output circuit of inverters under low-noise operation with
carrier frequency from 8 to 15kHz, (6kHz higher for 30kW or larger inverters),
this filter has the following functions:
1. Suppresses fluctuation of motor terminal voltage.
Protects the motor insulation from being damaged by PWM voltage overshoot.
(400V series)
2. Suppresses leakage current from output side wiring.
Reduces leakage current caused when several motors are operated in parallel
or connected with long wiring.
*Total wiring length should be less than 400m.
3. Suppresses radial noise or inductive coupling from output side wiring.
Effective noise suppression device for long wiring applications such as plant.
Note: When connecting this filter, set the carrier frequency F26 at 8kHz or more.
(Use the DCR to normalise the power supply in the following cases.]
1. The power transformer capacity is 500kVA or over and exceeds the inverter
rated capacity by 10 times.
2. The inverter and a thyristor converter are connected with the same transformer.
* Check if the thyristor converter uses a commutation reactor. If not, AC reactor
must be connected to the power supply side.
3. Overvoltage trip occurs due to open/close of the phase-advancing capacitor
for the power supply lines.
4. The voltage unbalance exceeds 2%.
Max. voltage [V] - Min. Voltage [V]
Voltage unbalance (%) =
Three-phase average voltage [V]
(For improving input power-factor, reducing harmonics)
• Used to reduce input harmonic current (correcting power-factor)
• For the resultant effects, contact IMO.
Optional. May be fitted to compensate for long motor cables, or shock loads
Analog frequency meter
72mm square, 0-10VDC, M/C, 1000Ω/V
Frequency setting potentiometer (mounted externally)
Use to mount the inverter on IEC compliance 35mm rail (up to 0.75kW).
Function
x 67 (%)
Mounting position
*
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