Alarm and fault messages
4.2 Alarm and fault messages
34
Table 4-11 Fault 39
(Alarm) DC link overvoltage Condition The CU has detected a DC voltage in excess of the
permissible value
Causes The measured DC voltage is too high
o The available DC voltage is too high
⇒ The PV field has been connected
incorrectly (the voltage rises too sharply at
high temperatures, mostly under no load)
o DC voltage measurement error
⇒ Parameter setting error (CU software)
⇒ Power pack defective (measured-value
sensing)
Adjust the parameter settings
Replace the power pack
Change the connection and/or the cabling of the PV field
Measures
Connect a braking resistor
Table 4-12 Fault 40
(Alarm) Fast Stop 2; Fast Stop via customer terminal block
Condition There is no signal at input 11/12 of the CU (green
connector); transferred via Profibus to the S7; drive has
not received an ON command.
Causes No line voltage for Fast OFF
o Fast Stop button has been pressed
o Wire break in the Fast OFF circuit
o No power supply for Fast OFF
o Fire alarm system has been activated (if
installed)
o No jumper on terminal strip X50 (if no Fast
Stop button is connected)
Unlock the Fast Stop button.
Measures
Repair the cabling