Lenze 8200 Frequency inverters Manual de usuario descargar pdf (Pagina 149)

Configuration

8200SHB01997-12

7.4.3 Change parameter set via DC-bus voltage

Only series “HVAC”

7.4.3.1 AC-motor braking by means of parameter set changeover

Code Possible settings IMPORTANT

No. Name Lenze Choice

C988* DC-bus voltage

threshold for

DC-bus voltage

control

0 0 {1 %} 200 C988 = 0 %

- Parameterset changeover

deactivated via DC-busvoltage

Changeover always betweenPAR1

and PAR2

Parameterset changeover via

terminal, bus or PC is not possible if

C988 > 0!

Function With the parameter set changeover in dependence of the DC-bus voltage, the AC motor braking

can be used as alternative for DC braking.

The AC motor braking is a braking method without external brake resistor for the control mode

“V/f-characteristic control withlinear characteristic”(C014 = -2-)”.

With mains voltages up to approx. 3 AC 400 V it is possible to achieve braking times shorter

than with the DC-brake.

The braking times forgenerative braking via external brake resistorare approx. 33 %shorter

than for AC motor braking.

Configuration of the

parameter sets

Code PAR1 setting

(active in normal

operation)

PAR2 setting

(active in braking operation)

Note

C013C

105

Braking time required

for AC braking

Deceleration time of the drive with

max. inertia load without getting the

message OU (overvoltage) during

deceleration.

C0013 forbraking along

the mainsetpoint ramp

C0105 forbraking along

the QSPramp

C015 Value adapted to the

drive,

e.g. V/f vertex= 50 Hz

Depending on the drive power up to

min. 25 % of the value under C015 in

PAR1:

Rule of thumb: 2.2 kW Õ 50 %

Decrease for lower drive power,

increase for higher drive power.

Thus the energy in the

motoris decreasedby

overexcitation in PAR2.

C016 Value adapted to the

drive,

e.g. V

min

=5%

Depending on the drive power up to

500 % of the value under C0016 in

PAR1:

Rule of thumb: 2.2 kW Õ factor 3

For lower drive power increase the

factor, for higher power decrease it.

Thus also in the lower

speed range, the energyin

the motor isdecreasedby

overexcitation in PAR2.

C988 Threshold

Setting according to the mains voltage:

400 VÕ 112 %

440 VÕ 123 %

460 VÕ 129 %

480 VÕ 133 %

Important AC motor braking can only be used together with the control mode “V/f-characteristic control

with linear characteristic”(C014 = -2-).

Parameter set changeover is not possible via terminal, bus or PC, if C988 > 0!

The higher the mains voltage, the longer the deceleration time for AC braking must be set in

PAR1, to fulfill the requirements stated above. It is therefore possible to achieve shorter

deceleration times with the DCB, if the mains voltage is high.

C988isthesameinallparametersets.

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