Yaskawa AC Drive-P1000 Industrial Fan - Manual (Page 252)

u L4: Speed Detection
These parameters set up the speed agree and speed detection functions that can be assigned to the multi-function output
terminals.
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.
No. Name Setting Range Default
L4-01 Speed Agreement Detection Level 0.0 to 400.0 Hz 0.0 Hz
L4-02 Speed Agreement Detection Width 0.0 to 20.0 Hz 2.0 Hz
Refer to H2-01 to H2-03: Terminal M1-M2, M3-M4, and MD-ME-MF Function Selection on page 214 , Settings 2, 3, 4,
and 5.
n 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. Name Setting Range Default
L4-03 Speed Agreement Detection Level (+/-) -400.0 to 400.0 Hz 0.0 Hz
L4-04 Speed Agreement Detection Width (+/-) 0.0 to 20.0 Hz 2.0 Hz
Refer to H2-01 to H2-03: Terminal M1-M2, M3-M4, and MD-ME-MF Function Selection on page 214 , Settings 13, 14,
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, A2, or A3. Frequency reference loss is detected
when the frequency reference drops below 10% of the reference or below 5% of the maximum output frequency within 400
ms.
100%
400 ms
Analog
frequency
reference
Loss of
Reference
output
time
10%
ON OFF
Figure 5.80 Loss of Reference Function
Set H2-01, H2-02, or H2-03 to C for a digital output to trigger when frequency reference loss occurs. Refer to Setting C:
Frequency Reference Loss on page 218 for details on setting the output function.
Parameter L4-05 selects the operation when a frequency reference loss is detected.
No. Name Setting Range Default
L4-05 Frequency Reference Loss Detection Selection 0, 1 0
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 to parameter L4-06. When the external frequency
reference value is restored, the operation is continued with the frequency reference.
5.8 L: Protection Functions
252 YASKAWA SIEP YAIP1U 01B AC Drive - P1000 Technical Manual