Lenze 8400 - LMfail1

17 Function library
17.1 Function blocks | L_MFail_1
1405
Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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17.1.102 L_MFail_1
In case the supply voltage fails, this FB serves to stop (brake) the drive or drive system in a controlled
way via L1, L2, L3 or +UG, -UG to prevent coasting.
Inputs
 Stop!
For drive systems that are coupled via digital frequency (a master drive and one or
several slave drives) the following applies:
• The mains failure detection and control may only be activated for the master drive.
• All inverters must be operated via the terminals +UG, -UG in the DC bus connection.
Designator
Data type
Information/possible settings
nAdapt_a
INT
Dynamic adaptation of the proportional gain of the DC-bus voltage controller
• The resulting proportional gain results from:
• Scaling: 16384 ≡ 100 %
nConst_a
INT
nDCSet_a
INT
Voltage setpoint on which the DC-bus voltage is to be kept.
• Scaling: 16384 ≡ 1000 V
nNset_a
INT
Speed setpoint in [%]
• Scaling: 16384 ≡ 100 % reference speed (C00011
)
bFault
BOOL
Activating the mains failure control
TRUE Activate mains failure control.
bReset
BOOL
Reset mains failure control
• A reset is always required when the restart protection is active or the restart
protection is used and the supply (mains or DC supply) has been switched on.
TRUE Reset mains failure control.
nThreshold_a
INT
Restart threshold in [%]
• Scaling: 16384 ≡ 100 % reference speed (C00011
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nConst_a [%] nAdapt_a [%]–
100 %
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