4 Device settings
4.5 Monitoring of the DC-bus voltage
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Lenze · i700 servo inverter · reference manual · DMS 3.0 EN · 06/2016 · TD06
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4.5.1 Resetting the "Undervoltage (LU)" error message
Available up to and including version 01.06 !
Operation of the servo inverter can only be enabled if the "Undervoltage (LU)" error message has
been reset after
connecting the mains voltage.
Triggering the "Undervoltage (LU)" error message
The "Undervoltage (LU)" error message, 0x2540:
2, triggers a fault if the DC-bus voltage is below the
error threshold while the 24 V supply voltage is connected.
This response occurs if
• the DC-bus voltage has not reached the error threshold yet when the system is switched on.
• the DC-bus voltage has fallen below the error threshold when the mains voltage fails.
Available from version 01.07 onwards
The "Undervoltage (LU)" error message can be already reset before
the mains voltage is connected.
• The "Undervoltage (LU)" warning that is indicated, 0x2540:3
, is reset automatically when the
mains voltage is connected.
Triggering the "Undervoltage (LU)" error message
The "Undervoltage (LU)" error message, 0x2540:2
, only triggers a fault if
•the "Operation enabled
" or "Quick stop active" device state is to become effective at initital
switch-on.
• the servo inverter is in the "Operation enabled
" or "Quick stop active" device state if the mains
voltage fails.
Diagnostics in the master control
If the servo inverter is in the "trouble" device state due to an undervoltage (LU), this state can be
diagnosed in the master control:
• An error bit is set in the status word.
• By output of the error number, an evaluation can be carried out.
• A status bit for undervoltage is set in the CiA status word.
Note!
If the mains voltage is connected, controller inhibit of the servo inverter must be
activated.
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