2.8 L: Protection Functions
210 YASKAWA ELECTRIC TOEP C710687 03B FSDrive-MV1000 Parameter Guide
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.
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L4-01, L4-02: Speed Agreement Detection Level and Detection Width
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.
Refer to H2: Contact Outputs on page 181.
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L4-03, L4-04: Speed Agreement Detection Level and Detection Width (+/-)
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.
Refer to H2-01 to H2-16: Functions for Contact Outputs 1 to 16 on page 181.
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L4-05: Frequency Reference Loss Detection Selection
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
Figure 2.76 Loss of Reference Function
To trigger a contact output when frequency reference loss occurs, set H2-01, H2-02, or H2-03 to C. Refer to Setting C:
Frequency Reference Loss on page 186 for details on setting the output function.
Note: This parameter is effective only when b1-01 (Frequency Reference Selection 1) is set to 1 (Analog input terminals).
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.
No. Name Setting Range Default
L4-01 Speed Agreement Detection Level 0.0 to 120.0 Hz <1> 0.0 Hz
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 Control Mode Dependent Parameter Default Values on page 84.
Speed Agreement Detection Width 0.0 to 20.0 Hz Determined by A1-02 <2>
No. Name Setting Range Default
L4-03
<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 Control Mode Dependent Parameter Default Values on page 84.
Frequency Detection Level (+/-) -120.0 to 120.0 Hz <1> 0.0 Hz
L4-04 Speed Agreement Detection Width (+/-) 0.0 to 20.0 Hz Determined by A1-02 <2>
No. Name Setting Range Default
L4-05 Frequency Reference Loss Detection Selection 0, 1 0
100%
400 ms
Analog
frequency
reference
Loss of
Reference
output
(H2-01 to -03 = C)
time
10%
ON
OFF
MV1000ParameterGuide_E_conditional.book 210 ページ ２０１３年１０月１１日 金曜日 午後８時１８分
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