L4: Reference Detection; L5: Fault Restart - YASKAWA P1000 Technical Manual

n L3-25: Load Inertia Ratio
Determines the ratio between the rotor inertia and the load. Set this parameter when using Single Drive KEB 2
<1>
(L2-29 = 1 ), Intelligent Stall Prevention during deceleration (L3-04 = 2), or the overvoltage suppression function
(L3-11 = 1).
No.
L3-25
When set incorrectly, a fairly large current ripple can result during Single Drive KEB 2 (L2-29 = 1
overvoltage suppression (L3-11 = 1) or other faults such as ov, Uv1, and oC.
Calculate parameter L3-25 in the formula below:
<1> Details on this function can be found in the standard P1000 Technical Manual (SIEPYAIP1U01) at www.yaskawa.com.
u

L4: Reference Detection

These parameters set up the Loss of Frequency Reference function.
n 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 or below 5% of the maximum output frequency within 400
ms.
Parameter L4-05 selects the operation when a frequency reference loss is detected.
No.
L4-05 Frequency Reference Loss Detection Selection
Setting 0: Stop
Drive follows the frequency reference (which is no longer present) and stops the motor.
Setting 1: Continue operation with reduced frequency reference
The drive will continue operation at the frequency reference value set to 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 at which the drive runs when L4-05 = 1 and when detecting a reference loss. The value is
set as a percentage of the frequency reference before the loss was detected.
No.
L4-06
u

L5: Fault Restart

After a fault has occurred, Fault Restart attempts to automatically restart the motor and continue operation instead of stopping.
YASKAWA SIEP YAIP1B 01B YASKAWA AC Drive – P1000 Bypass Technical Manual
Name
Load Inertia Ratio
L3-25 =
Analog
frequency
reference
400 ms
Loss of
Reference
OFF
output
Figure 5.46 Loss of Reference Function
Name
Name
Frequency Reference at Reference Loss
Setting Range
Machine Inertia
Motor Inertia
100%
10%
ON
time
Setting Range
Setting Range
0.0 to 100.0%
5.8 L: Protection Functions
Default
1.0 to 1000.0
<1>
). This may cause
Default
0, 1
Default
80.0%
1.0
5
0
139