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100%
400ms
Analog
frequency
reference
Loss of
Reference
output
time
80%
10%
ON
OFF
Figure 5.85 Loss of Reference Function
To have a fault output trigger when frequency reference loss occurs, set H2-01, H2-02, or H2-03 to “C”.
Frequency Reference Loss on page 199
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 or 1
0
Setting 0: Stop
The drive will stop 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.
n
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 before the loss was detected.
No.
Name
Setting Range
Default
L4-06
Frequency Reference at Reference Loss
0.0 to 100.0%
80.0%
n
L4-07: Speed Agreement Detection Selection
Determines when frequency detection is active using parameters L4-01 through L4-04.
No.
Name
Setting Range
Default
L4-07
Speed Agreement Detection Selection
0, 1
0
Setting 0: No Detection During Baseblock
Setting 1: Detection Always Enabled
n
L4-08: Speed Agreement Detection Conditions
Note:
Parameter available in drive software versions PRG: 1016 and later.
Determines whether soft-starter output or estimated motor speed constitutes a speed agreement situation.
No.
Name
Setting Range
Default
L4-08
Speed Agreement Detection Conditions
0, 1
0
Setting 0: Match Speed with the Soft-Starter Output
Setting 1: Match Frequency Reference and Motor Speed
Note:
In V/f control the drive ignores the value set to L4-08 and refers to the soft-starter output to determine whether a speed agreement situation
has been reached.
The following functions are influenced by the speed agree condition:
•
Overtorque alarms oL3 and oL4 when parameters L6-01 or L6-04 are set to 1, 3, 5, or 7.
•
DriveWorksEZ functions that use speed agree output
•
The Up 2/Down 2 functions
•
Multi-Function Digital Output Settings
5.8 L: Protection Functions
228
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual