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4.2Powerfailurebridging

4.2.1Detectionofavoltagefailure

The mains failure support feature detects a failure of at least two phases of the mains

supply. If no countermeasures are taken, this failure will cause a drop in the DC link

voltage and thus lead to the device being switched off.

In the event of a power failure, the DC link voltage can be supported by using the

motor’s rotational energy. To this end, the motor will be operated as a generator and

decelerated in a controlled manner in the event of a power failure so that a

configurable DC link voltage setpoint will be maintained. This function is especially

useful when it comes to powering the electronics in drives with magnetic bearings,

as this will prevent the assembly from crashing into the safety bearing in the event of

a power failure all the way to the lowest possible speeds.

NOTE

l Pleasenotethatthecomponentswhichneedbridgingmustbe

poweredviatheDClink(DCpowersupply).Inparticular,the

powersupplyofthedrivecontrolleritself(24Vcontrolvoltage)

mustbeensured.

Image 4.2: Power failure bridging settings screen

ID No.: 0842.26B.5-01Date: 09.2020

ServoOne- Device Help

4 Power stage

4.2.1.1Functionaldescription

The P2940 - CON_PowerFail_Sel selection parameter can be used to select the

following operating modes:

0= (OFF) switched off

1= (Ret) Power failure bridging with power return detection. The system will start up

again if the power returns within a configurable period of time.

2= (NoRet) Power failure bridging with power return detection. The system will not

start up again.

3= (NoLim) Fastest possible speed reduction without power return detection.

4 = (VFC_NoLim) Only with HF function package; please refer to the “Power failure

bridging” section in the “HF function package” User manual (ID No.: 1107.22B.x)

5= (RetAbs) Same as 1=Ret, but with absolute voltage levels and without validation

check.

6= (NotRetAbs) Same as 2=NoRet, but with absolute voltage levels and without

validation check.

7= (NoRetAbsPulse) Same as 6=NoRetAbs, but with pulse operation.

NOTE

l ForinformationontheadvancedV/Hzmode,seethe“HFfunction

package"Usermanual(IDNo.:1107.22B.x).



Keba ServoOne User Manual

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