Mitsubishi Electric FR-A720-0.4K Specifications download pdf (Page 89)

Features

Standard

Specifications

Outline

Dimension

Drawings

Operation

Panel

Protective

Functions

OptionsInstructionsMotorCompatibilityWarrantyInquiry

Terminal Connection

Diagram

Terminal Specification

Explanation

Parameter

List

Explanations

Parameters

Peripheral

Devices

Capacitances exist between the inverter I/O cables, other cables

and earth and in the motor, through which a leakage current flows.

Since its value depends on the static capacitances, carrier

frequency, etc., low acoustic noise operation at the increased

carrier frequency of the inverter will increase the leakage current.

Therefore, take the following measures. Select the earth leakage

current breaker according to its rated sensitivy current,

independently of the carrier frequency setting.

To-earth (ground) leakage currents

Line leakage current

 Harmonic suppression guideline in Japan

Harmonic currents flow from the inverter to a power receiving point via a

power transformer. The harmonic suppression guideline was established

to protect other consumers from these outgoing harmonic currents.

The three-phase 200V input specifications 3.7kW or less are

previously covered by "Harmonic suppression guideline for household

appliances and general-purpose products" and other models are

covered by "Harmonic suppression guideline for consumers who

receive high voltage or special high voltage". However, the general-

purpose inverter has been excluded from the target products covered

by "Harmonic suppression guideline for household appliances and

general-purpose products" in January 2004. Later, this guideline was

repealed on September 6, 2004. All capacities of all models are now

target products of "Harmonic suppression guideline for consumers who

receive high voltage or special high voltage".

⋅ "Harmonic suppression guideline for consumers who receive high

voltage or special high voltage"

This guideline sets forth the maximum values of harmonic currents

outgoing from a high-voltage or especially high-voltage consumer who

will install, add or renew harmonic generating equipment. If any of the

maximum values is exceeded, this guideline requires that consumer to

take certain suppression measures.

Users who use models other than the target models are not covered by

the guideline.

However, we ask to connect an AC reactor or a DC reactor as before to

the users who are not covered by the guideline.

For compliance to the

"Harmonic suppression guideline for consumers

who receive high voltage or special high voltage

For compliance to “Harmonic suppression guideline of the

transistorized inverter (input current of 20A or less) for consumers

other than specific consumers” published by JEMA.

 Calculation of outgoing harmonic current

Leakage currents

Type Influence and Measures

Influence

and

measures

⋅ Leakage currents may flow not only into the inverter's own line

but also into the other lines through the earth (ground) cable,

etc.These leakage currents may operate earth (ground) leakage

circuit breakers and earth leakage relays unnecessarily.

 Countermeasures

⋅ If the carrier frequency setting is high, decrease the Pr.72

PWM frequency selection setting.

Note that motor noise increases. Select Pr.240 Soft-PWM

operation selection to make the sound inoffensive.

⋅ By using earth leakage circuit breakers designed for

harmonic and surge suppression in the inverter's own line

and other line, operation can be performed with the carrier

frequency kept high (with low noise).

Undesirable

current path

Type Influence and Measures

Influence and

measures

⋅ This leakage current flows via a static capacitance

between the inverter output cables.

⋅ The external thermal relay may be operated unnecessarily

by the harmonics of the leakage current. When the wiring

length is long (50m or more) for the 400V class small-

capacity model (7.5kW or less), the external thermal relay

is likely to operate unnecessarily because the ratio of the

leakage current to the rated motor current increases.

 Countermeasures

⋅ Use Pr.9 Electronic thermal O/L relay.

⋅ If the carrier frequency setting is high, decrease the Pr.72

PWM frequency selection setting.

Note that motor noise increases. Select Pr.240 Soft-PWM

operation selection to make the sound inoffensive.

To ensure that the motor is protected against line-to-line

leakage currents, it is recommended to use a temperature

sensor to directly detect motor temperature.

Undesirable

current path

Power

supply

Leakage

breaker

Leakage

breaker

NV1

NV2

Inverter

Motor

Power

supply

Thermal relay

Line-to-line static

capacitances

MCCB MC

Line-to-line leakage currents path

Motor

Inverter

Input Power

Supply

Target

Capacity

Measures

Three-phase

200V

All

capacities

Make a judgment based on “Harmonic suppression

guideline for consumers who receive high voltage

or special high voltage” issued by the Japanese

Ministry of Economy, Trade and Industry (formerly

Ministry of International Trade and Industry) in

September 1994 and take measures if necessary.

For calculation method of power supply harmonics,

refer to materials below.

Reference materials

⋅

“Harmonic suppression measures of the inverter”

Jan. 2004 JEMA :Japan Electrical

Manufacturer’s Association

⋅ “Calculation method of harmonic current of

the general-purpose inverter used by specific

consumers”

JEM-TR201 (revised in Dec. 2003): Japan

Electrical Manufacturer’s Association

Three-phase

400V

Input Power

Supply

Target

Capacity

Measures

Three-phase

200V

3.7kW or

less

Connect the AC reactor or DC reactor recommended

in a catalog or an instruction manual.

Reference materials

⋅

“Harmonic suppression guideline of the general-

purpose inverter (input current of 20A or less)”

JEM-TR226 (enacted in Dec. 2003):Japan

Electrical Manufacturer’s Association

Outgoing harmonic current = fundamental wave current (value converted

from received power voltage)

× operation ratio × harmonic content

⋅ Operation ratio:Operation ratio = actual load factor ×operation time ratio

during 30 minutes

⋅ Harmonic content: found in Table.

Table 1:Harmonic content (values of the fundamental current is 100%)

Reactor 5th 7th 11th 13th 17th 19th 23rd 25th

Not used 65 41 8.5 7.7 4.3 3.1 2.6 1.8

Used (AC side) 38 14.5 7.4 3.4 3.2 1.9 1.7 1.3

Used (DC side) 30 13 8.4 5.0 4.7 3.2 3.0 2.2

Used (AC, DC sides) 28 9.1 7.2 4.1 3.2 2.4 1.6 1.4

Table 2:Rated capacities and outgoing harmonic currents of inverter-driven motors

Appli-

cable

Motor(

kW)

Rated

Current

[A]

Fundamental

Wave Current

Converted

from 6.6kV

(mA)

Rated

Capacity

(kVA)

Outgoing Harmonic Current Converted from

6.6kV(mA)

(No reactor, 100% operation ratio)

200V 400V 5th 7th 11th 13th 17th 19th 23rd 25th

0.4

1.61 0.81

49 0.57

31.85 20.09 4.165 3.773 2.107 1.519 1.274 0.882

0.75

2.74 1.37

83 0.97

53.95 34.03 7.055 6.391 3.569 2.573 2.158 1.494

1.5

5.50 2.75

167 1.95

108.6 68.47 14.20 12.86 7.181 5.177 4.342 3.006

2.2

7.93 3.96

240 2.81

156.0 98.40 20.40 18.48 10.32 7.440 6.240 4.320

3.7

13.0 6.50

394 4.61

257.1 161.5 33.49 30.34 16.94 12.21 10.24 7.092

5.5

19.1 9.55

579 6.77

376.1 237.4 49.22 44.58 24.90 17.95 15.05 10.42

7.5

25.6 12.8

776 9.07

504.4 318.2 65.96 59.75 33.37 24.06 20.18 13.97

36.9 18.5

1121 13.1

728.7 459.6 95.29 86.32 48.20 34.75 29.15 20.18

49.8 24.9

1509 17.6

980.9 618.7 128.3 116.2 64.89 46.78 39.24 27.16

18.5

61.4 30.7

1860 21.8

1209 762.6 158.1 143.2 79.98 57.66 48.36 33.48

73.1 36.6

2220 25.9

1443 910.2 188.7 170.9 95.46 68.82 57.72 39.96

98.0 49.0

2970 34.7

1931 1218 252.5 228.7 127.7 92.07 77.22 53.46

121 60.4

3660 42.8

2379 1501 311.1 281.8 157.4 113.5 95.16 65.88

147 73.5

4450 52.1

2893 1825 378.3 342.7 191.4 138.0 115.7 80.10

180 89.9

5450 63.7

3543 2235 463.3 419.7 234.4 169.0 141.7 98.10

245 123

7455

87.2 2237 969 626 373 350 239 224 164

293 147

8909

104 2673 1158 748 445 419 285 267 196

110

357 179

10848

127 3254 1410 911 542 510 347 325 239

132

— 216

13091

153 3927 1702 1100 655 615 419 393 288

160

— 258

15636

183 4691 2033 1313 782 735 500 469 344

220

— 355

21515

252 6455 2797 1807 1076 1011 688 645 473

250

— 403

24424

286 7327 3175 2052 1221 1148 782 733 537

280

— 450

27273

319 8182 3545 2291 1364 1282 873 818 600

315

— 506

30667

359 9200 3987 2576 1533 1441 981 920 675

355

— 571

34606

405

10382

4499 2907 1730 1627 1107 1038 761

400

— 643

38970

456

11691

5066 3274 1949 1832 1247 1169 857

450

— 723

43818

512

13146

5696 3681 2191 2060 1402 1315 964

500

— 804

48727

570

14618

6335 4093 2436 2290 1559 1462 1072

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 102 103

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Mitsubishi Electric FR-A720-0.4K Specifications Page 89

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