Precautions For Use Of The Vector Inverter - Mitsubishi Electric FR-V500 Instruction Manual

1.5 Precautions for use of the vector inverter

The FR-V500 series is a highly reliable product, but incorrect peripheral circuit making or operation/handling
method may shorten the product life or damage the product.
Before starting operation, always recheck the following items.
(1) Use insulation-sleeved crimping terminals for the power supply and motor cables.
(2) The inverter will be damaged if power is applied to the inverter output terminals (U, V, W).
(3) After wiring, wire offcuts must not be left in the inverter.
Wire offcuts can cause an alarm, fault or malfunction. Always keep the inverter clean.
When drilling mounting holes in an enclosure etc., take care not to allow chips and other foreign matter to enter
the inverter.
(4) Wire the cables of the recommended size to make a voltage drop 2% or less.
If the wiring distance is long between the inverter and motor, a main circuit cable voltage drop will cause the
motor torque to decrease especially at the output of a high frequency.
Refer to Instruction Manual (basic) for the recommended wire sizes.
(5) The overall wiring length should be 100m maximum.
Especially for long distance wiring, the fast response current limit function may be reduced or the equipment
connected to the secondary side may malfunction or become faulty under the influence of a charging current
due to the stray capacity of the wiring. Therefore, note the overall wiring length.
(6) Electromagnetic wave interference
The input/output (main circuit) of the inverter includes high frequency components, which may interfere with the
communication devices (such as AM radios) used near the inverter. In this case, install the optional FR-BIF radio
noise filter (for use on the input side only) or FR-BSF01 or FR-BLF line noise filter to minimize interference.
(7) Do not install a power factor correction capacitor, surge suppressor or radio noise filter (FR-BIF option) on the
output side of the inverter.
This will cause the inverter to trip or the capacitor and surge suppressor to be damaged. If any of the above devices is
installed, immediately remove it. (When the FR-BIF radio noise filter is connected, switching power off during motor
operation may result in E. UVT. In this case, connect the radio noise filter in the primary side of the magnetic contactor.)
(8) Before starting wiring or other work after the inverter is operated, wait for at least 10 minutes after the power
supply has been switched off, and check that there are no residual voltage using a tester or the like. The
capacitor is charged with high voltage for some time after power off and it is dangerous.
(9) A short circuit or earth (ground) fault in the inverter output side may damage the inverter modules.
• Fully check the insulation resistance of the circuit prior to inverter operation since repeated short circuits
caused by peripheral circuit inadequacy or an earth (ground) fault caused by wiring inadequacy or reduced
motor insulation resistance may damage the inverter modules.
• Fully check the to-earth (ground) insulation and inter-phase insulation of the inverter secondary side before power on.
Especially for an old motor or use in hostile atmosphere, securely check the motor insulation resistance etc.
(10) Do not use the inverter power supply side magnetic contactor to start/stop the inverter.
Always use the start signal (turn on/off terminals STF, STR-SD) to start/stop the inverter. (Refer to page 14.)
(11) Across the P and PR terminals, connect only an external regenerative brake discharge resistor.
Do not connect a mechanical brake.
(12) Do not apply a voltage higher than the permissible voltage to the inverter I/O signal circuits.
Application of a voltage higher than the permissible voltage to the inverter I/O signal circuits or opposite polarity
may damage the I/O devices. Especially check the wiring to prevent the speed setting potentiometer from
being connected incorrectly to short terminals 10E-5.
(13) Use of single-phase power supply
Do not use single-phase power input.
(14) Precautions for use of any motor other than the vector control dedicated motor (SF-V5RU, SF-VR) and
standard motor with encoder (SF-JR)
a)Vector control cannot be exercised without encoder.
b)Connect the encoder to the backlash-free motor shaft.
(15) Since the rated voltage differs from the commercial power supply voltage, the Mitsubishi dedicated motor
cannot perform bypass operation.
Capacity (VA) of separate power supply
The capacity is 60VA or more for 15kW or less and 80VA for 18.5kW to 55kW when separate power is supplied from
R1, S1.
3.7kW or less
SF-V5RU
5.5kW or more
3.7kW or less
SF-V5RUH
5.5kW or more
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Precautions for use of the vector inverter

170V
160V
340V
320V
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