Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 193)

n L8-06: Input Phase Loss Detection Level
Sets the Input Phase Loss Detection (PF) Level.
Triggers PF fault when there is an imbalance larger than the value set to L8-06 in the drive input power voltage.
Detection Level = 100% = Voltage Class ×
No. Name Setting Range Default
L8-06 Input Phase Loss Detection Level 0.0 to 50.0% Det. by o2-04
n L8-07: Output Phase Loss Protection Selection
Enables or disables the output phase loss detection triggered when the output current falls below 5% of the drive rated current.
Note: Output phase loss detection may mistakenly trigger if the motor rated current is very small compared to drive rating. Disable L8-07 in such
cases.
No. Name Setting Range Default
L8-07 Output Phase Loss Protection Selection 0 to 2 1
Setting 0: Disabled
Setting 1: Fault when One Phase Is Lost
An output phase loss fault (LF) is triggered and the motor coasts to stop when one output phase is lost.
Setting 2: Fault when Two Phases Are Lost
An output phase loss fault (LF) is triggered and the motor coasts to stop when two or more output phases are lost.
n L8-09: Output Ground Fault Detection Selection
Enables or disables the output ground fault detection.
No. Name Setting Range Default
L8-09 Output Ground Fault Detection Selection 0, 1
Determined by
o2-04
Setting 0: Disabled
Ground faults are not detected.
Setting 1: Enabled
A ground fault (GF) is triggered when high leakage current or a ground short circuit occurs in one or two output phases.
n L8-38: Carrier Frequency Reduction Selection
Selects operation of the carrier frequency reduction function. Reduces the carrier frequency when the output current exceeds
a certain level. This temporarily increases the overload capability, allowing the drive to run through transient load peaks
without tripping.
No. Name Setting Range Default
L8-38 Carrier Frequency Reduction Selection 0 to 2 Det. by o2-04
Setting 0: Disabled
No carrier frequency reduction at high current.
Setting 1: Enabled for Output Frequencies below 6 Hz
The carrier frequency is reduced at speeds below 6 Hz when the current exceeds 100% of the drive rated current. The drive
returns to the normal carrier frequency when the current falls below 88% or the output frequency exceeds 7 Hz.
Setting 2: Enabled for Entire Frequency Range
The carrier frequency is reduced at the following speeds:
• Below 6 Hz when the current exceeds 100% of the drive rated current.
• Above 7 Hz when the current exceeds 112% of the drive rated current.
The drive uses the delay time set in parameter L8-40 and a hysteresis of 12% when switching the carrier frequency back to
the set value.
5.8 L: Protection Functions
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual 193
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Programming