YASKAWA FSDrive-MV1000 Parameter Manual page 210

2.8 L: Protection Functions
u L4: Speed Detection
These parameters set up the speed agree and speed detection functions, which can be assigned to the contact output
terminals.
The speed is detected using the motor speed when A1-02 = 3.
L4-01, L4-02: Speed Agreement Detection Level and Detection Width
n
Parameter L4-01 sets the detection level for the contact 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.
No.
L4-01
L4-02
<1> Range upper limit is determined by the maximum output frequency (E1-04) and the upper limit of the frequency reference (d2-01).
<2> For details on the default settings, refer to
Refer to H2: Contact Outputs on page
L4-03, L4-04: Speed Agreement Detection Level and Detection Width (+/-)
n
Parameter L4-03 sets the detection level for the contact 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 Speed Agreement Detection Width (+/-)
<1> Range upper limit is determined by the maximum output frequency (E1-04) and the upper limit of the frequency reference (d2-01).
<2> For details on the default settings, refer to
Refer to H2-01 to H2-16: Functions for Contact Outputs 1 to 16 on page
L4-05: Frequency Reference Loss Detection Selection
n
The drive can detect a loss of an analog frequency reference from analog input 1 or 2. Frequency reference loss is
detected when the frequency reference drops below 10% of the master speed frequency reference before or below 5% of
the maximum output frequency within 400 ms.
Figure 2.76
To trigger a contact output when frequency reference loss occurs, set H2-01, H2-02, or H2-03 to C. Refer to
Frequency Reference Loss on page 186
Note: This parameter is effective only when b1-01 (Frequency Reference Selection 1) is set to 1 (Analog input terminals).
No.
L4-05 Frequency Reference Loss Detection Selection
Setting 0: Stop
Drive follows the frequency reference (which is no longer present) and stops 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.
210
Name
Speed Agreement Detection Level
Speed Agreement Detection Width
Control Mode Dependent Parameter Default Values on page
181.
Name
Frequency Detection Level (+/-)
Control Mode Dependent Parameter Default Values on page
Analog
frequency
reference
400 ms
Loss of
Reference
OFF
output
(H2-01 to -03 = C)
Figure 2.76 Loss of Reference Function
for details on setting the output function.
Name
Setting Range
0.0 to 120.0 Hz
<1>
0.0 to 20.0 Hz
Setting Range
-120.0 to 120.0 Hz
<1>
0.0 to 20.0 Hz
181.
100%
10%
ON
time
Setting Range
0, 1
YASKAWA ELECTRIC TOEP C710687 03B FSDrive-MV1000 Parameter Guide
Default
0.0 Hz
Determined by A1-02
84.
Default
0.0 Hz
Determined by A1-02
84.
common_TMonly
Default
0
<2>
<2>
Setting C: