Mitsubishi 840 Series Specifications download pdf (Page 26)

5 PRECAUTIONS FOR USE OF THE INVERTER

The FR-A800 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:

 Use crimping terminals with insulation sleeve to wire the power supply and motor.

 Application of power to the output terminals (U, V, W) of the inverter will damage the inverter. Never perform such wiring.

 After wiring, wire offcuts must not be left in the inverter.

Wire offcuts can cause an alarm, failure or malfunction. Always keep the inverter clean. When drilling mounting holes in

a control box etc., take care not to allow chips and other foreign matter to enter the inverter.

 Use cables of the appropriate size to make a voltage drop of 2% maximum.

If the wiring distance is long between the inverter and motor, a voltage drop in the main circuit will cause the motor

torque to decrease especially at the output of a low frequency.

Refer to page 10 for the recommended cable size.

 The overall wiring length should be within the prescribed length.

Especially for long distance wiring, the fast-response current limit function may be reduced or the equipment connected

to the inverter output 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. (Refer to page 13)

 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, activate the EMC filter (turn ON the

EMC filter ON/OFF connector) to minimize interference. (Refer to the Instruction Manual.)

 Do not install a power factor correction capacitor, varistor or arrester on the inverter output side.

This will cause the inverter to trip or the capacitor, varistor, or arrester to be damaged. If any of the above devices is

installed, immediately remove it.

 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.

 If "EV" is displayed on the operation panel, turn OFF the 24 V external power supply before performing wiring.

 A short circuit or earth fault on 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 fault caused by wiring inadequacy or reduced motor insulation resistance

may damage the inverter modules.

– Fully check the to-earth insulation and inter-phase insulation of the inverter output side before power-on.

Especially for an old motor or use in hostile atmosphere, securely check the motor insulation resistance etc.

 Do not use the inverter input side magnetic cont

actor (MC) to start/stop the inverter.

Since repeated inrush currents at power ON will shorten the life of the converter circuit (switching life is about 1,000,000

times), frequent starts and stops of the MC must be avoided.

Always use the start signal (ON/OFF of STF and STR signals) to start/stop the inverter.

 Across terminals P/+ and PR, connect only an external brake resistor.

Do not connect a mechanical brake.

 Do not apply a voltage higher than the permissible voltage to the inverter I/O signal circuits.

Contact 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 and 5.

 Provide electrical and mechanical interlocks for MC1 and

MC2 which are used for commercial power supply-inverter

switch-over.

When the wiring is incorrect or if there is a commercial

power supply-inverter switch-over circuit as shown on the

right, the inverter will be damaged by leakage current from

the power supply due to arcs generated at the time of

switch-over or chattering caused by a sequence error.

(The commercial power supply operation is not available with vector control dedicated motors (SF-V5RU, SFTHY) nor

with PM motors.)

 If the machine must not be restarted when power is restored after a power failure, provide a magnetic contactor (MC) in

the inverter's input side and also make up a sequence which will not switch on the start signal.

If the start signal (start switch) remains on after a power failure, the inverter will automatically restart as soon as the

power is restored.

MC2

MC1

R/L1

S/L2

T/L3

Inverter

Undesirable current

Interlock

Power supply

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 57 58

Comments to this Manuals

No comments

Mitsubishi 840 Series Specifications Page 26

Comments to this Manuals

Related products and manuals for TVs & monitors Mitsubishi 840 Series