Alarm and fault messages
4.2 Alarm and fault messages
32
Causes Inlet air temperature too high
o Air inlet to switchroom is blocked
o Air outlet from switchroom is restricted
o Ambient temperature is too high
Replace the defective components
Check the parameter settings
Measures
Clean or enlarge the air inlet
Table 4-5 Faults 4 and 47
Fault 4 (alarm): Inverter overload, I²t monitoring, stage 1
Fault 33 (alarm): Inverter is signaling overtemperature, stage 2
Condition The CU has detected a current which is higher than the
permissible l²t limit.
Excessive current
o Parameter setting error (CU software –
current limit value)
Causes
Fault in measured-value sensing
o Parameter setting error (CU software - limit
value I2t)
Measures Adjust the parameter settings
Table 4-6 Fault 6
(Alarm) overload Condition The CU has detected a current which is higher than the
selected permissible value.
USI is defective
AC current transformer defective
Causes
Parameter setting error
Measures Adjust the parameter settings
Table 4-7 Fault 12
(Alarm) System is in commissioning mode Condition The CU has detected that commissioning mode is
selected
Causes The CU is in commissioning mode
Measures Set the CU operating mode to "Reversion"
Table 4-8 Fault 14
(Alarm) Fan has exceeded its useful life Condition The hours counter in the CU has reached "0" (hours are
counted backwards)
The fan has operated for 35,000 hours since initial
commissioning
Causes
The value set initially for the hours counter was too low
Replace the fan.
Measures
Set the hours counter to 35,000 hours.