5-46
H98
Protection/Maintenance (Selection)
Specifies a combination between automatic lowering of carrier frequency, output
phase loss protection, input phase loss protection.
Automatic lowering of carrier frequency
Select this feature to protect the system from any failure which could result from the
inverter tripping due to the heat sink overheating (
OH1) or overload (OLU), ab-
normally high ambient temperature or a cooling mechanism failure. This feature
lowers the output frequency before the inverter enters Alarm mode. However, the
level of motor noise may increase.
Input phase loss protection (
L )
If a phase loss is detected in the three-phase input power source, the inverter will
enter Alarm mode and issue an alarm (
L
). This prevents the inverter from un-
dergoing heavy stress that may be caused by input phase loss or interphase volt-
age unbalance exceeding 6%.
If connected load is light or a DC reactor is connected to the inverter, this
function will not detect input phase loss if any.
For inverters with single-phase input, this protection does not take effect.
Do not enable it. When you single-phase an inverter designed for a
three-phase input for the testing purposes, you may disable this protection
only if you can reduce its load.
Output phase loss protection (
OPL)
The inverter will enter the alarm mode activated by the output phase loss protection,
and issue the alarm
OPL if it detects an output phase loss while it is running.
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