3–45

L2002 Inverter

The graph below shows an inverter output profile that starts decelerating to a stop. At two different points during the deceleration, regenerative voltage elevates the DC bus level, exceeding the LADSTOP threshold set by B131. When the Over-voltage LADSTOP feature is enabled by B130 = 01, the inverter stops the deceleration ramp in each case until the DC bus level is again less than the threshold value.

B130 = 01 OVLADSTOP = enable

Inverter stops

Vdeceleration Over-voltage protection

trip threshold

Over-voltage B131

LADSTOP threshold

DC bus level

t

Output frequency

Start

deceleration

Deceleration resumed

t

When using the Over-voltage LADSTOP feature, please note the following:

When the over-voltage LADSTOP feature is enabled (B130 = 01), the actual deceleration is sometimes longer than the value set by parameters F003/F203.

The over-voltage LADSTOP feature does not operate by maintaining a constant DC bus voltage. So, it is still possible to have an over-voltage trip event during extreme deceleration.

If B131 is set lower than the normal DC bus voltage (when not in decel) by mistake, or if the inverter’s input voltage increases enough, then the inverter will apply LADSTOP (if enabled) all the time. In this case, the inverter can accelerate and run the motor, but it cannot decelerate. If you are not sure that B131 > DC bus voltage, measure the DC bus voltage in your installation and verify that the B131 value is higher.

 

“B” Function

Run

 

Defaults

 

 

 

 

 

Mode

 

 

 

Func.

Name /

 

 

–FE(F)

–FU

 

 

Description

Edit

Units

Code

SRW Display

 

Lo Hi

(EU)

(USA)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B130

Over-voltage

 

Pauses deceleration ramp when

✘ ✔

00

00

 

LADSTOP enable

 

DC bus voltage rises above

 

 

 

 

 

 

 

threshold level, in order to

 

 

 

 

 

OVLADSTOP

OFF

 

 

 

 

 

avoid over-voltage trip.

 

 

 

 

 

 

 

Two option codes:

 

 

 

 

 

 

 

00 .. Disable

 

 

 

 

 

 

 

01 .. Enable

 

 

 

 

 

 

 

 

 

 

 

 

Parameters Drive

Configuring