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Alarm and fault messages 
4.2 Alarm and fault messages  
37 
Table 4-19 Fault 91 
(Alarm) Fuse has tripped 
Condition 
No power supply available for signaling circuit 
A contact in the signaling circuit is open 
o
  A fuse has tripped 
o
  Fuse is not inserted, or not correctly inserted 
o
  Other contacts (AC cabinet, medium voltage) 
are open  
No power supply for the signal  
Wire break 
Causes 
Temporary Profibus failure 
Replace the fuse (always replace plus and minus at the 
same time) 
Repair the power supply 
 
Measures 
Repair the cabling 
 
Table 4-20 Fault 92 
(Alarm) Overvoltage protection has responded 
Condition 
No power supply available for the signaling circuit of the 
surge arrester monitor 
Open signal contact on a surge arrester 
o
  Surge arrester has tripped 
o
  Plug-in module is not inserted, or not correctly 
inserted 
o
  No AC auxiliary power supply connected to the 
surge arrester in the AC distribution board 
(DEHN valve) (if installed) 
Fault in signal power supply 
Wire break 
Causes 
Temporary Profibus failure 
Replace the surge arresters (always replace plus and 
minus or all three phases at the same time) 
Repair the power supply 
 
Measures 
Repair the cabling 
 
Table 4-21 Fault 93 
(Alarm) Fast Stop button has been pressed 
Condition 
No voltage connected to the Fast Stop contact on the 
S7 
Fast Stop button has been pressed 
Fault in power supply for Fast OFF 
Wire break in the Fast OFF circuit 
Causes 
Fire alarm system has been activated (if installed) 
Unlock the Fast Stop button. 
Repair the power supply 
 
Measures 
Repair the cabling