YASKAWA A1000 Technical Manual page 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.
No.
L4-03
L4-04
<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.
Refer to H2-01 to H2-03: Terminal M1-M2, M3-M4, and M5-M6 Function Selection on page
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
To have a digital output trigger when frequency reference loss occurs, set H2-01, H2-02, or H2-03 to C.
C: Frequency reference loss on page 250
Parameter L4-05 selects the operation when a frequency reference loss is detected.
No.
L4-05
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.
No.
L4-06

L4-07: Speed Agree 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
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Name
Speed Agreement Detection Level (+/-)
Speed Agreement Detection Width (+/-)
Analog
frequency
reference
400 ms
Loss of
OFF
Reference
output
Figure 5.105 Loss of Reference Function
for details on setting the output function.
Name
Frequency Reference Loss Detection Selection
Name
Frequency Reference at Reference Loss
Name
Speed Agree Detection Selection
Setting Range
-400.0 to 400.0 Hz
Ratio of analog
frequency reference
before loss
100%
L4-06 (%)
10%
ON
time
Setting Range
Setting Range
Setting Range
5.8 L: Protection Functions
Default
0.0 Hz
<1>
0.0 to 20.0 Hz Determined by A1-02
246, Settings 13, 14, 15,
Refer to Setting
Default
0 or 1
Default
0.0 to 100.0% 80.0%
Default
0 or 1
<1>
0
5
0
289