Low Frequency Fault (Freq Low Alarm)
Fault Definition: Indicates that the 3 Phase Frequency connected to the terminals “25-24-23”, which are defined as
“R-S-T” is lower than the value entered to the “P147 Mains Frequency Low Alarm” parameter. It is a malfunction that
stops the compressor rapidly.
Possible Causes and required actions: There may be a decrease in the frequency of mains voltage. The value that is
entered to the parameter may have been wrong for the application.
Phase Sequence / Unbalance Error (Phase Unbalance)
Fault Definition: Indicates that the sequence of 3 Phase Frequency connected to the terminals “25-24-23”, which are
defined as “R-S-T”, is not suitable for the device or is unbalanced. It is a malfunction that stops the compressor
rapidly.
Possible Causes and required actions: There may be a problem with the mains connections. The value of the "P142
Unbalance%" parameter may not be suitable for the system. If the phase sequence / unbalance control is not
needed, the parameter "P152 PhaseSequence Protect" must be set as "0" (passive).
1.6.3 Functional Faults
Service Time (Service Level 1, 2, 3, 4, 5)