vfd & short circuit ratings

Data Bulletin8800DB1203

03/2013

Variable Frequency Drives and Short-Circuit Current Ratings

Retain for future use.

2013 Schneider Electric All Rights Reserved

Introduction Short-circuit current ratings (SCCRs) for variable frequency drives (VFDs) is a topic that has been discussed often without clarity. Some manufacturers provide SCCRs based on testing only the output section of VFDs. While this method of test may be suitable for across-the-line starters used for motor control, Schneider Electric tests VFDs following the strictest interpretation of applicable standards and conducts SCCR tests based on the most likely failure points in the VFD, which is not the output section. Also, due to the electronic nature of VFDs, their characteristics may change depending on their electrical power system connection. The level of prospective short-circuit current (PSCC) available at the point where a VFD is connected to electrical power can have a significant impact on the safety, longevity, and cost of a VFD installation. Typical VFDs use diodes to convert AC electrical power to DC power. The DC power is stored in the VFDs capacitor bank, also called the DC bus. Insulated gate bipolar transistors (IGBTs) are then used to re-create an AC sine wave to provide power to AC induction motors. The PSCC level can have a significant thermal impact on the VFDs diodes and capacitor bank.

The following should be considered when specifying and installing a VFD:

What is the level of PSCC specified? What type of overcurrent protective device (OCPD) will be used? What type of enclosure rating is required for the installation? What are the rated thermal characteristics of the VFD? Is a line reactor or DC choke required? What is the SCCR of the VFD?This data bulletin clarifies the terms and standards used in the industry, explains the thermal impact of PSCC values on VFDs, and provides VFD installation ratings information. This bulletin also includes discussion on when to specify or install line reactors or DC chokes, and the aspects of installing a VFD without using an enclosure. In addition, the reader will understand how the cost of a VFD installation is directly proportional to the SCCR level specified. Considering these topics can lead to a robust, cost effective, and energy efficient VFD installation without over specifying rating requirements and adding unnecessary components and cost.

Terminology To address these topics, an understanding is needed of the following terms: Prospective short-circuit current Overcurrent protective device, rated as ampere interrupting capacity

(AIC) or interrupting rating (IR) VFD input rating Short-circuit current rating VFD output interrupt rating

Variable Frequency Drives and Short-Circuit Current Ratings 8800DB1203Terminology 03/2013

2013 Schneider Electric All Rights Reserved2

Figure 1 shows a mapping of where the terms are applied in a one-line schematic of a VFD installed in an enclosure and of a VFD installed with a Type 1 conduit kit, without the use of an additional enclosure.

Prospective Short-Circuit Current The prospective short-circuit current refers to the amount of current that would flow at a given point on the electrical distribution system if a piece of bus bar were bolted across the phases and then the power was turned on. The amount of current that would flow would be limited by the impedance of the power system. The power system impedance is the result of the resistances and reactances of the transformers and the wiring. The PSCC is the symmetrical fault current that would flow, and does not include the asymmetrical component which could occur depending on the timing of the short circuit. PSCC is also referred to as the available fault current (AFC).

Instead of specifying the system resistance and inductance, many specifications reference the PSCC level in kilo amperes. Common PSCC levels specified are 5, 10, 22, 42, 65, and 100 kA.

Overcurrent Protective Device Circuit breakers and fuses are commonly used to meet code requirements for overcurrent protection. Circuit breakers have the ability to interrupt the high current that can flow in the event of a short circuit, and typically have a rating in kAIC, which stands for thousand amperes interrupting capacity. Fuses have a similar IR specification defined in rms symmetrical amperes. Although a VFD can detect a short on the output IGBTs and stop conducting very quickly, this provides no protection upstream of the IGBT output section. Therefore, the VFD cannot carry an AIC or IR rating in the same way that a fuse or circuit breaker can, nor can it be used to meet code requirements for an overcurrent protection device.

VFD Input Rating The level of PSCC can have a significant thermal impact on the VFDs input diodes and capacitor bank. The VFDs input current increases significantly as the level of PSCC rises. This is caused by the input diodes conducting only when the input voltage is higher than the DC bus. The current is then limited only by the system impedance. Applying a VFD on an electrical system with a higher PSCC than the VFD input rating may cause

Figure 1: Terms Mapped to One-Line Schematic

M

VFD

Prospective short-circuit current at point of connection

Short-circuit current rating

Overcurrent protective device(AIC or IR)

VFD input rating

VFD output interrupt rating

Line reactor (if required)

Type 1 conduit kit

M

VFD

Enclosed VFDVFD with

Type 1 conduit kit

8800DB1203 Variable Frequency Drives and Short-Circuit Current Ratings03/2013 Terminology

2013 Schneider Electric All Rights Reserved 3

overheating of the diodes and capacitor sections, and reduce the life expectancy of the VFD or damage the VFD. Figure 2 shows the effects of a power system with 5 kA PSCC on the input current of a 5 hp drive. The peak input current is around 30 A.

In Figure 3 the same model drive and output load are used as in Figure 2, but the input power system is modified to provide 100 kA PSCC. Note that the input current peaks now nearly reach 70 A.

Figure 2: Input Line Current on a 5 kA PSCC Power System

T ime

500ms 550ms 600msI(L1) RMS(I(R8)) RMS(I(L1))

-80A

0A

80A

Figure 3: Input Line Current on a 100 kA PSCC Power System

T ime

500ms 550ms 600msI(L1) RMS(I(R8)) RMS(I(L1))

-80A

0A

80A

Variable Frequency Drives and Short-Circuit Current Ratings 8800DB1203Terminology 03/2013


When the PSCC is higher, the current peaks are much higher and the rms current is also higher. This is common for AC drives using a 6-pulse diode front-end. For more information see Schneider Electric Product Data Bulletin 8800DB0801, The Effects of Available Short-Circuit Current on AC Drives.

Because the higher current peaks occur on systems with higher PSCC, there is more heating in the input diodes and the DC bus capacitors. VFDs are designed for a specific expected maximum PSCC. The power component selection and the power section layout of the VFD design determines at what level of PSCC the product will be rated. This value is the VFD input rating. Schneider Electric publishes this rating under the column heading maximum prospective line Isc in VFD ratings tables. Schneider Electric also publishes line reactor requirements to use when the PSCC exceeds the VFD input rating in documentation that ships with each VFD.

Short-Circuit Current Rating Short-circuit current rating refers to the amount of PSCC a device such as a VFD or an enclosed VFD is rated to withstand. The National Electrical Code defines the SCCR as, The prospective symmetrical fault current at a nominal voltage to which an apparatus or system is able to be connected without sustaining damage exceeding defined acceptance criteria. The VFD or the enclosed VFD must not create a shock hazard and must contain any flame, fire, or explosion hazard during a short-circuit event. For example, an enclosed VFD with a 30 kA SCCR can be applied on a power system with a PSCC of 30 kA or less.

An enclosures SCCR is calculated from the SCCRs of the various components in the enclosure. Several papers and flow charts have been published showing how to establish the proper rating for an enclosure. The SCCR may also be determined by testing the complete assembled enclosure. Schneider Electric obtains ratings for our standard enclosed family of VFDs by testing the complete assembled enclosure in which the VFD is mounted. Testing a complete assembled enclosure is often not practical in low volume or highly customized enclosed VFDs. In these instances, the rating of the VFD itself and other products in the enclosure are used in determining the maximum SCCR of the enclosure.

The Standard Technical Panel for UL 508C voted in late 2012 to clarify the wording to ensure that all VFD manufacturers conduct tests and provide consistent SCCR data across the industry. This action will benefit customers and installers by having more standardized information available when applying VFDs. These clarifications have been written into UL 61800-5-1, which is the new UL standard for VFDs. While the effectivity date for UL 61800-5-1 is three years away, Schneider Electric has tested VFDs according to the methods described in the new standard for over a decade.

Both UL 508C and UL 61800-5-1 specify product marking information. As the physical size of VFDs decreases, manufacturers are commonly supplying the product marking information in accompanying documents. For marking the SCCR, UL 508C 57.1 uses the following phrases:

General marking:Suitable For Use On A Circuit Capable Of Delivering Not More Than ___ rms Symmetrical Amperes, ___ Volts Maximum.

For protection by a fuse:When Protected By ___ Class Fuses (with a maximum rating of ___).

For protection by a circuit breaker:When Protected By A Circuit Breaker Having An Interrupting Rating Not Less Than ___ rms Symmetrical Amperes, ___ Volts Maximum.

8800DB1203 Variable Frequency Drives and Short-Circuit Current Ratings03/2013 When to Use a Line Reactor or a DC Choke


UL marking requirements may also include the manufacturer's name and the part number for the OCPD. See UL 508C 57.1.1., November 9, 2010.

Schneider Electric determines the SCCR of the VFD based on containment testing. These ratings are obtained by performing containment tests that involve shorting internal components, such as the input diodes and DC bus capacitors, while connected to the specified PSCC level and using the specified OCPD. Not all manufacturers have published ratings based on containment tests. Some manufacturers have simply provided ratings based on shorting the VFDs output. This output test method is how across-the-line starters have been tested to obtain SCCRs and does not adequately test a VFD. Schneider Electric has provided SCCRs based on the VFD input rating and containment testing, following the strictest interpretation of UL 508C. This is the language that has been clarified in UL 61000-5-1, such that in the future, all VFD manufacturers will need to conduct containment tests that involve shorting internal components and not rely on obtaining ratings for the entire VFD based on testing the output section.

If the drive is mounted in an enclosure, the enclosure must contain any shock, flame, fire or explosion hazard. Refer to "Installing a VFD without an Enclosure" on page 7 for additional comments.

Most fuses clear faster than today's circuit breakers and allow less energy to enter the VFD during a short circuit. Therefore, containing the energy is easier with fuses than with circuit breakers or Type E manual motor protective devices, and typically allows a higher SCCR.

Schneider Electric publishes a document for each VFD detailing the specific SCCR depending on PSCC, VFD input rating, and what level of PSCC requires a line reactor.

VFD Output Interrupt Rating The VFD output interrupt rating has been a point of confusion in the industry as some VFD manufacturers have published a VFD output interrupt rating leading customers and installers to think that this is the SCCR of the VFD. To determine the VFD output interrupt rating, an output short-circuit test is performed by shorting the output wires from the drive to the motor. Since the drive can detect a short circuit on the output and turn off the IGBTs in microseconds, the current never gets to a high level. This test is easily passed regardless of the PSCC. Because of this, some VFD manufacturers publish a 100 kA rating, but without clearly specifying any other ratings.

A VFD should be applied on a 100 kA power system only if the SCCR and the input rating are suitable for a 100 kA system.

When to Use a Line Reactor or a DC Choke

When the PSCC value at the point of the connection of the VFD is higher than the VFD input rating, a line reactor or DC choke must be used to reduce the PSCC and limit the current spikes discussed in Figure 2. Schneider Electric VFD installation manuals contain ratings tables that show the maximum prospective line Isc where Isc stands for current short circuit as shown in Figure 4. This Isc value is the same as the VFD input rating described in this data bulletin. This value is the highest PSCC that the VFD can be connected to without adding an external impedance such as a line reactor or DC choke. Long runs of cable and transformers also add impedance. In other rating documents this may be called an input AFC rating or an input thermal rating. These values are also provided in the installation material that ships with each VFD. A list of document numbers for each VFD can be found at the end of this bulletin.

Variable Frequency Drives and Short-Circuit Current Ratings 8800DB1203When to Use a Line Reactor or a DC Choke 03/2013


Instead of providing an input thermal rating, some VFD manufacturers specify that if the transformer power rating is 10 times (or some other ratio) larger than the VFD power rating, then a line reactor must be used. VFD manufacturers may require a line reactor if there is low line impedance defined as less than 1% line reactance. While these methods can be applied to Schneider Electric VFDs also, we believe the information that we are providing is much clearer and easier for customers and installers to use.

Care should be taken not to simply specify a line reactor for every installation to cover the possibility of a high PSCC. Elevated available fault currentsabove 5 kAare not present in many of the pump and fan applications in commercial, educational, healthcare, or lodging buildings. This presents a significant opportunity to reduce system costs in a majority of these facilities.

When you no longer need to specify or install a line reactor, the savings in installation costs are immediate. It eliminates the cost of purchasing a line reactor and decreases the mounting space requirements in mechanical rooms. This also lightens the weight of the installation. Also, since line reactors consume energy, their elimination removes a drag on efficiency and automatically makes a system consume less energy. In addition, line reactors give off heat. System designs without line reactors will require fewer measures for heat dissipation. Lastly, eliminating line reactors does away with the voltage drops that they cause. Unless line reactors are being specified for harmonic mitigation, line reactors or other impedance should only be specified when it has been determined that the PSCC is higher than the VFD input rating.

Figure 4: Maximum Prospective Isc Column in a Typical VFD Ratings Table

8800DB1203 Variable Frequency Drives and Short-Circuit Current Ratings03/2013 Example of Drive Ratings Table


Installing a VFD without an Enclosure

It is becoming more common to mount and install a VFD without placing it in an enclosure. Two installation examples are:

1. Mounting the VFD on a mechanical room wall for controlling a pump or fan motor.

2. Mounting the VFD along a material handling conveyor to control the motor of a conveyor section.

Most VFDs have an option to attach a kit that accepts conduit connections and provide a Type 1 enclosure rating. When mounted in this fashion, the VFD itself must not create a shock hazard and contain any flame, fire, or explosion hazard during a short-circuit event. This is easier to achieve when the VFD is mounted in an enclosure, and more difficult to achieve when the VFD itself is mounted on a wall. It is common for a VFD to have a lower SCCR when mounted and installed without using an enclosure. In many cases, a wall-mounted VFD may not be able to obtain a SCCR with a circuit breaker. SCCRs with fuses are more attainable as fuses have greater energy limiting capabilities than circuit breakers on the market today.

Schneider Electric publishes SCCR information for VFDs that can be mounted in this fashion with a Type 1 enclosure rating in the information shipped with the VFD.

Example of Drive Ratings Table

Table 1 on page 8 provides short-circuit current ratings and branch circuit protection information for a portion of the Altivar 61 drive family.

The combinations in the tables have been tested per UL 508C (Reference UL file E116875).

These ratings are in addition to ratings on the nameplate of the product. The values for the overcurrent protection devices are the maximum

allowable ampere size. Smaller ampere ratings may be used. Integral solid state short-circuit protection does not provide branch circuit

protection. Branch circuit protection must be provided in accordance with the National Electrical Code and any additional local codes.

The devices are provided with software integral overload and overspeed protection for the motor. Protection at 110% of the full load motor current. The motor thermal protection current (ItH) must be set to the rated current indicated on the motor nameplate. (For details see the programming manual.)

167 F (75 C) copper conductor with the AWG wire size for all products, except ATV61HC16N4 to ATV61HC63N4, ATV61HC11Y to ATV61HC80Y: 140 F (60 C) / 167 F (75 C) copper conductor with the AWG wire size.

Suitable for use on a circuit capable of delivering not more than___X___rms symmetrical kiloAmperes,___Y___Volts maximum, when protected by___Z1___with a maximum rating of___Z2___.

Variable Frequency Drives and Short-Circuit Current Ratings 8800DB1203Example of Drive Ratings Table 03/2013


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JJL3

6250

100

1321

5

250

710

013

215

150

75

4900

3040

120

ATV6

1HD

30M

3X22

0.10

RL1

3001

JJL3

6250

100

1321

5

250

710

013

215

200

75

9640

3750

144

ATV6

1HD

37M

3X22

0.07

5R

L160

01JJ

L362

5010

013

215

25

0 7

100

1321

522

5 7

596

4045

6017

6AT

V61H

D45

M3X

220.

055

RL2

0001

LAL3

6400

2286

40

400

722

8640

300

710

9640

Con

tinue

d on

nex

t pag

e

8800DB1203 Variable Frequency Drives and Short-Circuit Current Ratings03/2013 Example of Drive Ratings Table


Thre

e-ph

ase

inpu

t, w

ith li

ne re

acto

r

380/480V

Three-phase

0.75

12.

3AT

V61H

075N

45

12R

L002

01H

LL36

015

100

4017

GV2

P08

480Y

/277

265

1600

15 7

, 810

040

176

7, 8

100

1078

1.50

24.

1AT

V61H

U15

N4

56.

5R

L004

02H

LL36

015

100

4017

GV2

P10

480Y

/277

465

1600

15 7

, 810

040

1712

7, 8

100

1078

2.20

35.

8AT

V61H

U22

N4

56.

5R

L004

02H

LL36

015

100

4017

GV2

P14

480Y

/277

565

1600

15 7

, 810

040

1715

7, 8

100

1078

3-

7.8

ATV6

1HU

30N

45

3R

L008

02H

LL36

015

100

4017

GV2

P14

480Y

/277

565

1920

15 7

, 810

040

1717

.5 7

, 810

015

504

510

.5AT

V61H

U40

N4

53

RL0

0802

HLL

3602

510

040

17G

V3P

1348

0Y/2

777.

565

1920

25 7

, 810

040

1725

7, 8

100

1550

5.5

7.5

14.3

ATV6

1HU

55N

422

2.5

RL0

1202

HLL

3603

510

065

28G

V3P

2548

0Y/2

7715

6528

8035

710

065

2840

710

019

877.

510

17.6

ATV6

1HU

75N

422

1.5

RL0

1802

HLL

3605

010

065

28G

V3P

2548

0Y/2

7715

6528

8050

710

065

2840

710

019

8711

1527

.7AT

V61H

D11

N4

221.

2R

L025

02H

LL36

060

100

6528

GV3

P40

480Y

/277

2565

4032

60 7

100

6528

15

2033

ATV6

1HD

15N

422

0.8

RL0

3502

HLL

3608

010

065

28G

V3P

5048

0Y/2

7730

6557

6080

710

065

2870

710

040

3618

2541

ATV6

1HD

18N

422

0.8

RL0

3502

HLL

3610

010

065

28G

V3P

5048

0Y/2

7730

6586

4010

0 7

100

6528

70 7

100

4036

2230

48AT

V61H

D22

N4

220.

7R

L045

02H

LL36

125

100

6528

GV3

P50

480Y

/277

3065

8640

125

710

065

2880

710

049

0030

4066

ATV6

1HD

30N

422

0.5

RL0

5502

HLL

3615

010

065

28G

V3P

6548

0Y/2

7740

6510

368

150

710

065

2890

710

072

3037

5079

ATV6

1HD

37N

422

0.4

RL0

8002

JLL3

6175

100

1321

5

175

710

013

215

110

710

072

3045

6094

ATV6

1HD

45N

422

0.4

RL0

8002

JLL3

6225

100

1321

5

225

710

013

215

150

710

012

044

5575

116

ATV6

1HD

55N

422

0.3

RL1

0002

JLL3

6250

100

1321

5

250

710

013

215

175

710

012

044

7510

016

0AT

V61H

D75

N4

220.

2R

L130

02JL

L362

5010

038

250

25

0 7

100

3825

022

5 7

100

1204

475

100

160

ATV6

1HD

75N

422

0.2

RL1

3002

KCL3

4250

100

3825

0

250

710

038

250

225

710

012

044

1An

ATV

61 d

rive

outp

ut s

hort-

circ

uit t

est w

as p

erfo

rmed

for 1

00kA

. In

addi

tion

to p

rovi

ding

a ra

ting

base

d on

sho

rting

the

outp

ut o

f the

driv

e, th

ese

shor

t-circ

uit r

atin

gs h

ave

been

obt

aine

d by

sho

rting

com

pone

nts

inte

rnal

to th

e A

ltiva

r 61

driv

e.

Thes

e ra

tings

allo

w p

rope

r coo

rdin

atio

n of

sho

rt-ci

rcui

t pro

tect

ion.

The

inte

gral

sol

id s

tate

sho

rt-ci

rcui

t pro

tect

ion

in th

e dr

ive

does

not

pro

vide

bra

nch

circ

uit p

rote

ctio

n. B

ranc

h ci

rcui

t pro

tect

ion

mus

t be

prov

ided

in a

ccor

danc

e w

ith th

e N

atio

nal

Elec

trica

l Cod

e an

d an

y lo

cal c

odes

. The

list

ed li

ne re

acto

r or m

inim

um im

peda

nce

is re

quire

d to

obt

ain

ratin

gs a

bove

the

inpu

t rat

ing.

2R

atin

gs a

pply

to a

n Al

tivar

61

driv

e m

ount

ed in

a n

on-v

entil

ated

Typ

e 1,

3R

, 4(X

), or

12

rate

d en

clos

ure.

Use

not

ed ra

tings

whe

n us

ing

a Ty

pe 1

con

duit

kit.

Min

imum

enc

losu

re v

olum

e al

low

s fo

r the

spe

cifie

d SC

CR

. You

r app

licat

ion

spec

ific

ther

mal

requ

irem

ents

may

requ

ire a

larg

er e

nclo

sure

.3

The

fuse

ratin

gs in

this

col

umn

are

for a

n A

ltiva

r 61

driv

e in

stal

led

with

a V

W3A

92

T

ype

1 co

ndui

t kit.

The

se fu

se ra

tings

in th

is c

olum

n ca

n al

so a

pply

to A

ltiva

r 61

driv

e in

stal

led

in a

Typ

e 1,

3R

, 4(X

), or

12

rate

d en

clos

ure

that

has

a m

inim

um

volu

me

liste

d in

the

tabl

e.4

This

col

umn

show

s th

e m

axim

um P

SC

C v

alue

that

can

not b

e ex

ceed

ed w

ithou

t add

ing

inpu

t im

peda

nce.

Ele

ctric

al d

istri

butio

n sy

stem

s w

ith a

hig

her P

SC

C w

ill c

ause

hig

her i

nput

cur

rent

s in

the

front

end

of t

he d

rive.

It is

pos

sibl

e fo

r the

test

ed

SCC

R ra

ting

of th

e dr

ive

to b

e lo

wer

than

this

inpu

t rat

ing.

The

test

ed S

CC

R ra

ting

can

be h

ighe

r tha

n th

is in

put r

atin

g w

hen

a lin

e re

acto

r is

used

.5

Circ

uit b

reak

ers

with

low

er in

terr

upt r

atin

gs c

an b

e us

ed w

ithin

the

sam

e ci

rcui

t bre

aker

fram

e ra

ting.

For

200

/240

Vac

, rep

lace

with

HG

L or

JG

L fo

r 65

kA in

terr

upt r

atin

g. F

or 3

80/4

80Va

c, re

plac

e w

ith H

GL

or J

GL

for 3

5kA

or H

JL o

r JJL

for

65kA

inte

rrup

t rat

ing.

For

500

/600

Vac,

repl

ace

with

HJL

for 2

5kA

or H

GL

for 1

8kA

, or H

DL

for 1

4kA

inte

rrup

t rat

ing.

648

0 V

ratin

gs a

re fo

r Wye

con

nect

ed e

lect

rical

dis

tribu

tion

syst

ems

only

. G

V2P

s

elf-p

rote

cted

man

ual c

ombi

natio

n st

arte

r mus

t be

used

with

GV2

GH

7 in

sula

ting

barr

ier t

o m

eet U

L 50

8 Ty

pe E

ratin

g.G

V3P

s

elf-p

rote

cted

man

ual c

ombi

natio

n st

arte

r mus

t be

used

with

GV3

G66

+ G

VA

M11

insu

latin

g ba

rrie

r to

mee

t UL

508

Type

E ra

ting.

7U

se fa

st a

ctin

g fu

se o

r tim

e de

lay

Cla

ss J

.8

Fuse

type

Cla

ss C

C.

Tabl

e1:

Shor

t-Circ

uit C

urre

nt R

atin

gs a

nd B

ranc

h C

ircui

t Pro

tect

ion

for t

he A

ltiva

r 61

Driv

e (c

ontin

ued)

Alti

var 6

1Sh

ort-C

ircui

t Cur

rent

Rat

ings

1

with

Circ

uit B

reak

er 2

with

GV

P 2

with

Fus

es 2

with

Fus

es a

nd T

ype

1 ki

t 3

Inpu

tvo

ltage

50/6

0H

z

YkW

HP

A

Cat

alog

nu

mbe

rIn

put

ratin

g

kA 4

Min

imum

indu

ctan

ce

mH

Line

re

acto

rre

fere

nce

Pow

erPa

ct

(Z1)

, (Z2

) 5(X

)SC

CR

kA

Min

imum

encl

osur

evo

lum

e

(in3 )

GV

PTy

pe E

6(Z

1), (

Z2)

GV

Pvo

ltage

ratin

g

V

GV

Pm

ax.

pow

er

HP

(X)

SCC

R

kA

Min

imum

en

clos

ure

volu

me

(in3 )

Fuse

ampe

rera

ting

(Z1)

, (Z2

) A

(X)

SCC

R

kA

Min

imum

en

clos

ure

volu

me

(in3 )

Fuse

ampe

rera

ting

(Z1)

, (Z2

) A

(X)

SCC

R

kA

Min

imum

en

clos

ure

volu

me

(in3 )

Variable Frequency Drives and Short-Circuit Current Ratings 8800DB1203Conclusion 03/2013


Conclusion Matching the drive input rating to the PSCC is not enough for proper drive installation. Careful consideration of both the containment rating and the input rating, along with their related OCPD, enclosure, and line reactor or DC choke requirements are essential.

Schneider Electric's experience with electric power distribution systems and VFDs products provides a unique position to understand the dynamics and interrelationships of these systems and products. Schneider Electric is leading the industry in providing information to allow end users, control panel builders, system integrators, and OEMs to make informed decisions with regard as to how to install a VFD, select the OCPD, and what SCCR rating can be obtained using various components. This information is available for all Altivar VFDs and can be found by a web search for the documents referred to below.

Additional documents that are available from Schneider Electric:

Document No. Drive ProductS1A58684 Altivar 12S1A73476 Altivar 212S1B16328 Altivar 312S1B39941 Altivar 32S1B86981 Altivar 61S1B86988 Altivar 71

Document No. Document Title8800DB0801 The Effects of Available Short-Circuit Current on

AC Drives8536DB0901 Motor Control Solutions for the North American

MarketCPTG005 Control Panel Technical Guide

8800DB1203 Variable Frequency Drives and Short-Circuit Current Ratings03/2013 Conclusion


Variable Frequency Drives and Short-Circuit Current Ratings 8800DB1203Data Bulletin 03/2013

Electrical equipment should be installed, operated, serviced, and maintained only by qualified personnel. No responsibility is assumed by Schneider Electric for any consequences arising out of the use of this material.

Altivar, PowerPact, and Schneider Electric are trademarks or registered trademarks of Schneider Electric. Other trademarks used herein are the property of their respective owners.

Schneider Electric USA, Inc.8001 Knightdale Blvd.Knightdale, NC 275451-888-778-2733www.schneider-electric.us


IntroductionTerminologyProspective Short-Circuit CurrentOvercurrent Protective DeviceVFD Input RatingShort-Circuit Current RatingVFD Output Interrupt Rating

When to Use a Line Reactor or a DC ChokeInstalling a VFD without an EnclosureExample of Drive Ratings TableConclusion

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