5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual 223
Parameter Details
5
u L4: Speed Detection
These parameters set up the speed agree and speed detection functions which can be assigned to the multi-function
output terminals.
A speed agree situation can be detected by the motor speed when using Closed Loop Vector Control and Closed Loop
Vector Control for PM motors.
n
L4-01, L4-02: Speed Agreement Detection Level and Detection Width
Parameter L4-01 sets the detection level for the digital output functions “Speed agree 1,” “User-set speed agree 1,”
“Frequency detection 1,” and “Frequency detection 2.”
Parameter L4-02 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 190, Settings 2, 3, 4, and 5.
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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 190, 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, 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.
Figure 5.85
Figure 5.85 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 194 for details on setting the output function.
Parameter L4-05 selects the operation when a frequency reference loss is detected.
Setting 0: Stop
Drive follows the frequency reference (which is no longer present) and simply stops the motor.
No.
<1> The setting range depends on the control mode selected for the drive. The setting range is 0.0 to 100.0% in AOLV/PM and CLV/PM.
<2> The setting range depends on the control mode selected for the drive. The setting range is 0.0 to 40.0% in AOLV/PM and CLV/PM.
Name Setting Range Default
L4-01
Speed Agreement Detection Level
0.0 to 400.0 Hz <1> Determined by A1-02 <1>
L4-02
Speed Agreement Detection Width
0.0 to 20.0 Hz <2> Determined by A1-02 <2>
No.
<1> The setting range depends on the control mode selected for the drive. The setting range is –100.0 to 100.0% in AOLV/PM and CLV/PM.
<2> The setting range depends on the control mode selected for the drive. The setting range is 0.0 to 40.0% in AOLV/PM and CLV/PM.
Name Setting Range Default
L4-03
Speed Agreement Detection Level (+/-)
–400.0 to 400.0 Hz <1> 0.0 Hz
L4-04
Speed Agreement Detection Width (+/-)
0.0 to 20.0 Hz <2>
Determined by A1-02
No. Name Setting Range Default
L4-05 Frequency Reference Loss Detection Selection 0 or 1 0
100%
400 ms
Analog
frequency
reference
Loss of
Reference
output
time
10%
ON
OFF
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