Lenze 8400 - Manual (Page 50)

3 Commissioning
3.2 Commissioning notes for external 24 V supply
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Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
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3.2 Commissioning notes for external 24 V supply
For devices with an external 24 V supply at terminal X10/24E, the following sequence is to be
observed during commissioning:
Switching on
1. Connection of the external 24 V supply
• Control electronics and fieldbus communication start to operate.
• The integrated 7-segment display shows the message "LU" (undervoltage in the DC bus).
2. Connection of the 400 V mains voltage
• The message "LU" goes off.
• The integrated 7-segment display changes to the automatic display, i. e. the parameter saved
as status value 1 is displayed. (Lenze setting: motor output frequency in [Hz])
Switching off
1. Disconnection of the 400 V mains voltage
2. Disconnection of the external 24 V supply
Related topics:
 LED status displays ( 554)
 Drive diagnostics via the integrated 7-segment display ( 557)

Note!
When the 24 V supply is disconnected, the control electronics become inoperable. The
switch function of Ethernet-based fieldbuses is also inoperable.
The disconnection of the 24 V supply in the case of an available 400 V mains voltage can
cause an error status for master controls.