YASKAWA T1000V - L4: Speed Detection

5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual 195
Parameter Details
5
Setting 1: Enabled
When the DC bus voltage rises due to regenerative load, an overvoltage fault is prevented by increasing the output
frequency.
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L3-17: Target DC Bus Voltage for Overvoltage Suppression and Stall Prevention
Sets the target DC bus voltage target level used by the overvoltage suppression function (L3-11 = 1) and Intelligent Stall
Prevention during deceleration (L3-04 = 2).
◆ L4: Speed Detection
These parameters set up the speed agree and speed detection functions which can be assigned to the multi-function
output terminals.
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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.
Refer to H2-01 to H2-03: Terminal MA, MB and MC, P1-C1 and P2-C2 Function Selection on page 168, Settings 2, 3,
4, and 5.
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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.
Refer to H2-01 to H2-03: Terminal MA, MB and MC, P1-C1 and P2-C2 Function Selection on page 168, Settings 13,
14, 15, and 16.
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L4-05: Frequency Reference Loss Detection Selection
The drive can detect a loss of an analog frequency reference from input A1 or A2. Reference loss is detected when the
frequency reference value reduces for 90% within 400 ms.
Figure 5.72
Figure 5.72 Loss of Reference Function
No.
<1> Values are for 200 V class drives and must be doubled for 400 V class drives.
<2> This value is initialized when E1-01 is changed.
Name Setting Range Default
L3-17
Target DC Bus Voltage for Overvoltage Suppression and Stall
Prevention
150 to 400 <1> 370 V <1> <2>
No. Name Setting Range Default
L4-01 Speed Agreement Detection Level –400.0 to 400.0 Hz 0.0 Hz
L4-02 Speed Agreement Detection Width 0.0 to 20.0 Hz 2.0 Hz
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
100%
400ms
Analog
frequency
reference
Loss of
Reference
output
time
80%
10%
ON
OFF