5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 289
L4-03, L4-04: Speed Agreement Detection Level and Detection Width (+/-)
Parameter L4-03 sets the detection level for the digital output functions “Speed agree 2,” “User-set speed agree 2,”
“Frequency detection 3,” and “Frequency detection 4.”
Parameter L4-04 sets the hysteresis level
for these functions.
Refer to H2-01 to H2-03: Terminal M1-M2, M3-M4, and M5-M6 Function Selection on page 246, Settings 13, 14, 15,
and 16.
L4-05: Frequency Reference Loss Detection Selection
The drive can detect a loss of an analog frequency reference from input A1, A2, or A3. Frequency reference loss is
detected when the frequency reference drops below 10% of the reference before or below 5% of the maximum output
frequency within 400 ms. Restoring the analog frequency reference to the L4-06 value or higher before loss occurs will
clear the frequency reference loss status.
Figure 5.105
Figure 5.105 Loss of Reference Function
To have a digital output trigger when frequency reference loss occurs, set H2-01, H2-02, or H2-03 to C. Refer to Setting
C: Frequency reference loss on page 250 for details on setting the output function.
Parameter L4-05 selects the operation when a frequency reference
loss is detected.
Setting 0: Operate following the frequency reference
Setting 1: Continue operation with reduced frequency reference
The drive will continue operation at the frequency reference value set in parameter L4-06. When the external frequency
reference value is restored, the operation is continued with the frequency reference.
L4-06: Frequency Reference at Reference Loss
Sets the frequency reference level the drive runs with when L4-05 = 1 and a reference loss was detected. The value is set
as a percentage of the frequency reference when the loss was detected.
L4-07: Speed Agree Detection Selection
Determines when frequency detection is active using parameters L4-01 through L4-04.
Setting 0: No detection during baseblock
Setting 1: Detection always enabled
No. Name Setting Range Default
L4-03
<1> In AOLV/PM and CLV/PM control modes, the setting units and range are expressed as a percent (-100.0 to 100.0%) instead of in Hz.
Speed Agreement Detection Level (+/-)
-400.0 to 400.0 Hz
<1> 0.0 Hz <1>
L4-04
Speed Agreement Detection Width (+/-)
0.0 to 20.0 Hz Determined by A1-02
No. Name Setting Range Default
L4-05 Frequency Reference Loss Detection Selection 0 or 1 0
No. Name Setting Range Default
L4-06 Frequency Reference at Reference Loss 0.0 to 100.0% 80.0%
No. Name Setting Range Default
L4-07 Speed Agree Detection Selection 0 or 1 0
Loss of
Reference
output
100%
L4-06 (%)
time
10%
nalog
frequency
reference
400 ms
ON
OFF
Ratio of analog
frequency reference
before loss
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