Parameter L4-04 sets the hysteresis level for these functions.
No. Name Setting Range Default
L4-03 Speed Agreement Detection Level (+/-) 0.0 to 400.0 Hz 0.0 Hz
L4-04 Speed Agreement Detection Width (+/-) 0.0 to 20.0 Hz 2.0 Hz
Refer to H2-01 to H2-03: Terminal MA/MB/MC, P1/PC and P2/PC Function Selection on page 186, Settings 13, 14,
15, and 16.
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L4-05: Frequency Reference Loss Detection Selection
The drive can detect a loss of an analog frequency reference from input A1 or A2. Reference loss is detected when the
frequency reference value reduces for 90% within 400 ms.
100%
400ms
Analog
frequency
reference
Loss of
Reference
output
time
80%
10%
ON
OFF
Figure 5.85 Loss of Reference Function
To have a fault 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 190 for details on setting the output function.
Parameter L4-05 selects the operation when a frequency reference loss is detected.
No. Name Setting Range Default
L4-05 Frequency Reference Loss Detection Selection 0 or 1 0
Setting 0: Stop
The drive will stop the motor.
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.
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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 before the loss was detected.
No. Name Setting Range Default
L4-06 Frequency Reference at Reference Loss 0.0 to 100.0% 80.0%
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L4-07: Speed Agreement Detection Selection
Determines when frequency detection is active using parameters L4-01 through L4-04.
No. Name Setting Range Default
L4-07 Speed Agreement Detection Selection 0, 1 0
Setting 0: No Detection During Baseblock
Setting 1: Detection Always Enabled
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L4-08: Speed Agreement Detection Conditions
Note: Parameter available in drive software versions PRG: 1016 and later.
Determines whether soft-starter output or estimated motor speed constitutes a speed agreement situation.
No. Name Setting Range Default
L4-08 Speed Agreement Detection Conditions 0, 1 0
Setting 0: Match Speed with the Soft-Starter Output
5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
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5
Parameter Details
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