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Table 4-16 Fault 63 

(Alarm) Direct current too high 

The CU / S7 has detected a direct current in excess of 
the set permissible limit 

Parameter setting error (S7 software) 
Parameter setting error (CU software) 
Open circuit (detected by the S7 and indicated by this 
fault code) 

Isolation amplifier is incorrectly set 
Adjust the parameter settings 
Repair the cabling 

 

Set the isolation amplifier correctly 

 

Table 4-17 Fault 64 

(Alarm) Vdc or dVdc/dt too high 

The CU has detected a DC voltage or an abrupt change 
in the DC voltage in excess of the permissible maximum 
value 
Parameter setting error  

Connected DC voltage is too high 
Adjust the parameter settings 
Replace the power pack 
Check the connection and/or the cabling of the PV field 

 

Install a braking resistor 

 

Table 4-18 Fault 65 

(Alarm) No checkback signal from the AC or DC contactor 

Signal is missing at the relevant S7 inputs 

S7 relay output module defective 
Incorrect setting in the S7 
DC contactor is defective 
AC contactor is defective  
Fault in power supply 

Wire break 
Replace the S7 relay output module 
Adjust the parameter setting 
Replace the defective contactor 
Repair the power supply 

 

Repair the cabling