Lenze DDS Function library 9300 Servo Instrukcja Użytkownika Pobierz pdf (Strona 17)

Function block library Lenze9300Servo.lib

Special functions

2.1.2 Supply−failure control (L_MFAIL)

2−7

Lenze9300Servo.lib EN 1.1

Range of functions

· Supply−failure detection

· Supply−failure control

· Restart protection

· Reset of the supply failure control

· Dynamic adaptation of the control parameters

· Fast supply recovery (KU)

· Application example

2.1.2.1 Supply failure detection

The type of the supply−failure detection to be used depends on the drive system used.

A failure of the voltage supply of the power stage is detected:

· by the level of the DC−bus voltage

· by an external system (e.g. supply module 934X or voltage−detection relay).

· Different systems can be combined.

Supply−failure detected by the level of the DC bus voltage

Use with single drives or multi−axis drives, which do not use external monitoring systems. For this,

you can use a comparator (e.g. L_CMP).

bIReset_b

bStatus_b

nNout_a

nSet_a

nAct_a

nThreshold_a

bReset_b

bFault_b

nNSet_a

nDcSet_a

nConst_a

nAdapt_a

bOut_b

L_CMP

L_MFAIL

L_CMP2

L_MFAIL

nIn2_a

nIn1_a

MCTRL_nDCVolt_a

FCODE_nC472_20_a

Abb. 2−7 Example of a supply−failure detection with internal function blocks (section)

Programming the example in Abb. 2−7:

1. Set the signal links according to Abb. 2−7

2. In FB L_CMP, set byFunction = 3 (nIn1 < nIn2)

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