Fulling DZB200M - Motor Overload Protection Current Setting; Over-voltage Stall Protection

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Bus vo lta ge

Stal l Over- voltag e point

Output frequency

Time t

During th e inverter decelerat ion, the load inertia may cause thea ctual motor speed droprate l owerthan

t he outputfrequency drop ra te,a nd therebythe motor generates electrici tyand feeds it ba ck to the inverter,

causing the i nvert er bus voltage going upand evenbusover-voltage br eakdown w hich then c an cause

i nverter trippingifno provis ionis made.

Over-volta ge stall pr otection func tion is to detect t he bus v olta ge and compare it with the sta ll ove r-

voltage point def ined by F5.05 (relative to t he standa rdbus voltage). Ifit exce eds the over-voltage st all

point, inverter ou tput freque ncystop goingdown,and when the ne xt bus voltage detected is lower than

t he over- vol tage stall point ,t he inver ter continue s to decelerat e,as shown by following figure :

Fig.6-22O ver-voltage StallFunct ion

When inve rter is r unni ng, the a ctual climbingrate of motor speed is lower t han climbing rat e of out put

f re quen c y b eca u se lo ad is to o big. I f you don't take an y actio n, i t will caus e ove r cu rre nt fault in

ac ce ler at ion then inv e rter w il l t rip.

Over-current stall protection function is t o detect output c urrent and compare it w ith the current limit

definedb yF5.06. If it exceeds thec urrent limit, output frequency drop down according to F5.07 . When it

show tha t output current is lower thanl imi t current, inver ter w ill remain normal operation.

F5. 04

Over -volt age

Stall Protectio n

0 prohibit

：

1allow

：

F5.05

Over -volt age St all

Prot ection Volt age

110 150% (3 80V)

～

12 0%

110 150% (2 20V)

～

115%

Fu nction

Code

Name

Setting Rang e

Default

Value

F5.0 6

Over -current stall s etti ng 80 200%

～

15 0%

F5.07

Over -current gain s ettin g

to avoi d of stall ing

0 100

～

Fu nction

Code

Name

Setting Rang e

Default

Value

Chapter 6 Parameter D escripti on

DZB Series

-66-

Fig.6-21 MotorO verloadProtect ion Current

Th e value c an be determined b y fol lowing equation:

Motor overl oad protection current = (maximum current/rat edcurrent) 100%

It is mai nly applie d to the ca sesthatbig inverter drives smallmotor, requiring to corre ctly set upthis

funct ion to protect the motor.

If the inst ant power-down drop ra te is setto be 0, the instant power-down res tartfunct ion is invalid.

Instant power- dow nfrequency dr oppoi nt: it i s indicting when the bus voltage,after the power network

is down a nddrops t othe instant power-down frequenc ydrop poin t, the invert er sta rts to decrease the

opera tionfrequency based on the i nsta nt power-down frequency drop rate, e nabli ng the motor to genera te

el ectricity which is fed back t o ke ep the bus volt age, and thus ensuringt he inverte ri soperatingnormall y

till inverterpower is on again.

Impor tan t: Adjusting these tw o p a r am ete r s prope rly can m a g nificen tly a ch ie ve the powe r networ k

switching ins tead of c ausi ng inverter protect ion and thusc ausingprod uction shutdow n.

70%

100%

140 %

200%

Cur rent

1minute

Time

Mo tor Over load Pro tection Current

F5.01

Mot or Ove rload

Pro tection C ur re nt

20.0% 1 20 .0%

(motor rated current)

～

100.0%

Funct ion

Code

Nam e

SettingRange

Default

Valu e

F5.02

Power- do wn F requ ency

Drop Point

70.0 110.0 %(standar d b us

voltage)

～

80.0%

F5. 0 3

Ins tan t p owe r-dow n

Frequ ency drop ra te

0.00Hz 99.99Hz

～

0.00Hz

Funct ion

Code

Nam e

SettingRange

Default

Valu e

Chapter 6 Parameter Descr iption

DZB S eri es

-65-

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Fulling DZB200M - Motor Overload Protection Current Setting; Over-voltage Stall Protection

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