Lenze DDS Function library 9300 Servo - Manual (Page 17)

Function block library Lenze9300Servo.lib
Special functions
2.1.2 Supply−failure control (L_MFAIL)
2−7
L
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_MFAIL1
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)