L4: Speed Detection - YASKAWA T1000V Technical Manual

Setting 1: Enabled
When the DC bus voltage rises due to regenerative load, an overvoltage fault is prevented by increasing the output
frequency.
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).
No.
Target DC Bus Voltage for Overvoltage Suppression and Stall
L3-17
<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.

◆ L4: Speed Detection

These parameters set up the speed agree and speed detection functions which can be assigned to the multi-function
output terminals.
■ 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.
L4-01
L4-02
Refer to H2-01 to H2-03: Terminal MA, MB and MC, P1-C1 and P2-C2 Function Selection on page
4, and 5.
■ 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.
L4-03
L4-04
Refer to H2-01 to H2-03: Terminal MA, MB and MC, P1-C1 and P2-C2 Function Selection on page
14, 15, and 16.
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
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
Name
Prevention
Name
Speed Agreement Detection Level
Speed Agreement Detection Width
Name
Speed Agreement Detection Level (+/–)
Speed Agreement Detection Width (+/–)
Analog
frequency
reference
400ms
Loss of
Reference
OFF
output
Figure 5.72 Loss of Reference Function
Setting Range
150 to 400
Setting Range
–400.0 to 400.0 Hz
0.0 to 20.0 Hz
Setting Range
–400.0 to 400.0 Hz
0.0 to 20.0 Hz
100%
80%
10%
ON
time
5.8 L: Protection Functions
Default
370 V
<1> <1> <2>
Default
0.0 Hz
2.0 Hz
168, Settings 2, 3,
Default
0.0 Hz
2.0 Hz
168, Settings 13,
5
195