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 (L2-29 = 1),
Intelligent Stall Prevention during deceleration (L3-04 = 2), or the overvoltage suppression function (L3-11 = 1).
Note:
This function is available in OLV/PM control mode.
No.
Name
Setting Range
Default
L3-25
Load Inertia Ratio
0.0 to 1000.0
1.0
When set incorrectly, a fairly large current ripple can result during Single Drive KEB 2 (L2-29 = 1). This may cause overvoltage
suppression (L3-11 = 1) or other faults such as ov, Uv1, and oC.
Calculate parameter L3-25 in the formula below:
L3-25 =
Machine Inertia
Motor Inertia
n
L3-26: Additional DC Bus Capacitors
Sets the capacity of any additionally installed DC bus capacitors. This data is used in calculations for Single Drive KEB Ride-
Thru 2. Adjust this setting only if external capacity is connected to the DC bus and Single Drive KEB 2 is used.
No.
Name
Setting Range
Default
L3-26
Additional DC Bus Capacitors
0 to 65000 μF
0 μF
n
L3-27: Stall Prevention Detection Time
Sets a delay time from when the Stall Prevention level is reached and the actual Stall Prevention function is activated.
No.
Name
Setting Range
Default
L3-27
Stall Prevention Detection Time
0 to 5000 ms
50 ms
u
L4: Speed Detection
These parameters set up the speed agree and speed detection functions that can be assigned to the multi-function output
terminals.
The speed is detected using the motor speed when A1-02 = 3 or 7.
n
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.
Name
Setting Range
Default
L4-01
Speed Agreement Detection Level
0.0 to 240.0 Hz
0.0 Hz
L4-02
Speed Agreement Detection Width
0.0 to 20.0 Hz
2.0 Hz
Refer to H2-01 to H2-03: Terminal M1-M2, M3-M4, and M5-M6 Function Selection on page 82
n
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.
Name
Setting Range
Default
L4-03
Speed Agreement Detection Level (+/-)
-240.0 to 240.0 Hz
0.0 Hz
L4-04
Speed Agreement Detection Width (+/-)
0.0 to 20.0 Hz
2.0 Hz
Refer to H2-01 to H2-03: Terminal M1-M2, M3-M4, and M5-M6 Function Selection on page 82
16.
1.8 L: Protection Functions
110
YASKAWA SIEP YAIZ1U 03B YASKAWA AC Drive – Z1000 Programming Manual
Summary of Contents for Z1000 CIMR-ZU*A Series
Page 339: ......