YASKAWA V1000 Technical Manual page 217

Parameter L4-04 sets the hysteresis level for these functions.
No.
L4-03
L4-04
Refer to H2-01 to H2-03: Terminal MA/MB/MC, P1/PC and P2/PC Function Selection on page
15, and 16.
n 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.
To have a fault output trigger when frequency reference loss occurs, set H2-01, H2-02, or H2-03 to "C".
C: Frequency Reference Loss on page 190
Parameter L4-05 selects the operation when a frequency reference loss is detected.
No.
L4-05 Frequency Reference Loss Detection Selection
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.
n 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.
L4-06
n L4-07: Speed Agreement Detection Selection
Determines when frequency detection is active using parameters L4-01 through L4-04.
No.
L4-07
Setting 0: No Detection During Baseblock
Setting 1: Detection Always Enabled
n 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.
L4-08
Setting 0: Match Speed with the Soft-Starter Output
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
Name
Speed Agreement Detection Level (+/-)
Speed Agreement Detection Width (+/-)
Analog
frequency
reference
400ms
Loss of
Reference
OFF
output
Figure 5.85 Loss of Reference Function
for details on setting the output function.
Name
Name
Frequency Reference at Reference Loss
Name
Speed Agreement Detection Selection
Name
Speed Agreement Detection Conditions
Setting Range
0.0 to 400.0 Hz
0.0 to 20.0 Hz
100%
80%
10%
ON
time
Setting Range
Setting Range
0.0 to 100.0%
Setting Range
Setting Range
5.8 L: Protection Functions
Default
0.0 Hz
2.0 Hz
186, Settings 13, 14,
Refer to Setting
Default
0 or 1 0
Default
80.0%
Default
0, 1 0
Default
0, 1 0
5
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