YASKAWA VS MINI J7 Specifications download pdf (Page 30)

Inverter

Selection

VS mini J7

NOTES ON USE

< Use a DC reactor (option) or an AC reactor (option) on the inverter power side when the inverter is connected directly to

a large-capacity power transformer (600kVA and over within 10m distance) or when a phase advance capacitor is

switched. Otherwise excess peak current may occur in the power feed circuit and the converter section may be damaged.

A DC reactor or an AC reactor is also required when a thyristor converter such as a DC drive is connected to the same

power system.

< When a special motor is used or more than one motor is driven in parallel with a single inverter, select the inverter

capacity so that 1.1 times of the total motor rated current does not exceed the inverter rated output current.

< The starting and accelerating characteristics of the motor driven by an inverter are restricted by the overload current

ratings of the inverter. Compared to running with commercial power supply, lower touque output should be expected. If

high starting torque is required, use an inverter of higher capacity or increase the capacities of both the motor and the

inverter.

< When an error occurs, a protective circuit is activated and the inverter output is turned OFF. However, the motor cannot

be stopped immediately. Use a mechanical brake and hold the equipment for a fast stop if necessary.

< Terminals +1 and +2 are for DC reactor (option). Do not connect other equipment.

Setting

< The inverter can be driven at an output frequency of up to 400Hz with the digital operator. Setting errors may create a

dangerous situation. Set the upper limit with the upper limit frequency setting function. (Maximum output frequency in

external input signal operation is preset to 60Hz at the factory.)

< Large DC injection braking operating voltages and times may cause motor overheating.

< Motor accel/decel time is determined by the motor generating touque, load torque, and load inertia WK

(GD

). If the

stall prevention function is activated during accel/decel, set the accel/decel time longer. After the stall prevention

function is activated, the accel/decel time is extended to a length that the inverter can handle. To shorten the accel/decel

time, increase the capacity of the inverter and possibly the motor.

Operation

< Applying power to inverter output terminals U/T

V/T

W/T

will damage the inverter. Double check wiring and

sequence before turnig the power ON.

< If magnetic contactor (MC) is used on the primary side of the inverter, do not use the MC for starting and stopping the

inverter. Otherwise, the inverter life may be reduced.

< After turning power to the inverter OFF, electric charges in the internal capacitors are retained temporarily. Wait until

the charge LED goes off before touching the inside of the inverter.

Installation

< Avoid oil mist or dust. Place the inverter in a clean area or house it in a totally-enclosed case so that no contamination

enters. To use the totally-enclosed case, select the cooling method and panel dimensions so the inverter ambient

temperature will be within the allowable range.

< Do not install the inverter on flammable material, such as wood.

< Install the inverter on a wall with the longer side in the vertical position.

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YASKAWA VS MINI J7 Specifications Page 30

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