YASKAWA E1000 User Manual

5.8 L: Protection Functions
228 YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual
■ 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 5.76
Figure 5.76 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.
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.
■
L4-07: Speed Agreement Detection Selection
Determines when frequency detection is active using parameters L4-01 through L4-04.
Setting 0: No detection during baseblock
Setting 1: Detection always enabled
◆ L5: Fault Restart
After a fault has occurred, this function attempts to automatically restart the motor and continue operation instead of
stopping.
The drive can be set up to perform a self-diagnostic check and resume the operation after a fault has occurred. If the self-
check is successful and the cause of the fault has disappeared, the drive restarts by first performing Speed Search (Refer
to b3: Speed Search on page 139 for details).
DANGER! Never use the fault restart function in hoist-type applications.
No. Name Setting Range Default
L4-05 Frequency Reference Loss Detection Selection 0 or 1 1
No. Name Setting Range Default
L4-06 Frequency Reference at Reference Loss 0.0 to 100.0% 80.0%
No. Name Setting Range Default
L4-07 Speed Agreement Detection Selection 0 or 1 0
100%
400 ms
Analog
frequency
reference
Loss of
Reference
output
time
10%
ON
OFF
common_TMonly
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YASKAWA E1000 Specifications

General

Brand	YASKAWA
Model	E1000
Category	Controller
Language	English