Lenze 8400 TopLine - Manual (Page 1559)

Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
1559
19 Function library
19.1 Function blocks
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19.1.106.7 Reset mains failure control
The mains failure control is rest by setting bReset to TRUE.
• A reset via bReset 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.
• The bReset input can, for instance, be connected to a digital input.
19.1.106.8 Restart protection
The integrated restart protection is to prevent a restart in the lower speed range when the supply
voltage was only interrupted briefly (mains recovery before drive stands still).
• The nThreshold_a input serves to specify the restart threshold in [%] with regard to the
reference speed ( C00011 ) below which no start has to take place after mains recovery.
• If in case of mains recovery the speed is below the restart threshold, the drive is continued to
be braked in a controlled way. This function is only stopped by setting bReset to TRUE.
• If the speed is above the restart threshold after mains recovery, the drive changes to its
setpoint nNSet_a.
• The function is switched inactive when nThreshold_a = 0 %.
• A reset takes place by setting bReset to TRUE and is required after every mains switching.
• In this case, the bActive output is set to TRUE when the bFault input is set to FALSE.
19.1.106.9 Quick mains recovery (KU)
The quick mains recovery causes a restart of the controller if the restart protection is not active
anymore.
• In case, the drive reaches its setpoint.
• If this behaviour is not desired, you can delay the restart by setting a retrigger time in
C01470/3
or prevent it by using the restart protection.
• Dependent on the system, the mains recovery is reported through the mains failure control via
the level of the DC-bus voltage.  Procedure of the mains failure control ( 1551)
A quick mains recovery is caused by a "quick interruption" of the energy supply company (e.g.
thunderstorm) and by faulty components in the supply cables (e.g. collector rings).
• Then, set the retrigger time in C01470/3 higher than the measured deceleration time reached
in braking operation.