YASKAWA L1000A - Page 230

5.8 L: Protection Functions
230 YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
■ L4-05: Speed Reference Loss Detection Selection
The drive can detect a loss of an analog speed reference from input A1 and A2. Speed reference loss is detected when the
speed reference falls below 10% of the previous reference, or below 5% of the maximum output frequency within 400 ms.
Figure 5. 38
Figure 5.38 Loss of Reference Function
Parameter L4-05 selects the operation when a speed reference loss is detected.
Setting 0: Stop
Drive follows the speed reference (which is no longer present) and simply stops the motor.
Setting 1: Continue operation with reduced speed reference
The drive will continue the operation at the speed reference value set in parameter L4-06. When the external speed
reference value is restored, the operation is continued with the external speed reference.
■
L4-06: Speed Reference at Reference Loss
Sets the speed 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 speed reference before the loss was detected.
■
L4-07: Speed Agree Detection Selection
Note: Available in drive software PRG: 7017 or later.
Determines when speed detection is active using parameters L4-01 through L4-04.
Setting 0: No detection during baseblock
Setting 1: Detection always enabled
■ L4-13: Door Zone Level
Sets the speed level for the car door to open. Once the car slows to the speed set in L4-13, a multi-function output terminal
set for “Door zone reached” will close (H2- = 52).
No. Parameter Name Setting Range Default
L4-05 Speed Reference Loss Detection Selection 0 or 1 0
No. Parameter Name Setting Range Default
L4-06 Speed Reference at Reference Loss 0.0 to 100.0% 80.0%
No. Parameter Name Setting Range Default
L4-07 Speed Agree Detection Selection 0 or 1 0
No. Parameter Name Setting Range Default
L4-13 Door Zone Level 0.0 to 100.0% 0.0%
100%
400 ms
Analog
speed
reference
10%
common_TMonly
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