Yaskawa AC Drive Z1000 AC Drive HVAC Fan - Manual (Page 104)

Amount of reduction = Slip frequency prior to KEB × (L2-08/100) × 2
No. Name Setting Range Default
L2-08 Frequency Gain at KEB Start 0 to 300% 100%
n L2-10: KEB Detection Time (Minimum KEB Time)
Determines the duration of KEB Ride-Thru operation after it is triggered.
No. Name Setting Range Default
L2-10 KEB Detection Time 0 to 2000 ms 50 ms
n L2-11: DC Bus Voltage Setpoint during KEB
Determines the setpoint (target value) for the DC bus voltage during Single KEB Ride-Thru 2. For Single KEB Ride-Thru 1
and System KEB Ride-Thru, parameter L2-11 defines the voltage level to end KEB Ride-Thru.
No. Name Setting Range Default
L2-11 DC Bus Voltage Setpoint during KEB 431.3 to 1150 Vdc
Determined by
E1-01
n L2-29: KEB Method Selection
Selects the way the Kinetic Energy Buffering function operates.
Note: If a multi function input is set for Single KEB Ride-Thru 2 (H1-oo = 7A, 7B), the setting of L2-29 is disregarded and the KEB mode equal
to L2-29 = 1 is automatically selected.
No. Name Setting Range Default
L2-29 KEB Method Selection 0, 1 0
Setting 0: Single Drive KEB Ride-Thru 1
Setting 1: Single Drive KEB Ride-Thru 2
u L3: Stall Prevention
The motor may experience excessive slip because it cannot keep up with the frequency reference when the load is too high or
acceleration and deceleration times are too short. If the motor slips during acceleration, it usually causes an overcurrent fault
(oC), drive overload (oL2), or motor overload (oL1). If the motor slips during deceleration, it can cause excessive regenerative
power to flow back into the DC bus capacitors, and eventually cause the drive to fault out from overvoltage (oV). The Stall
Prevention Function prevents the motor from stalling and while allowing the motor to reach the desired speed without requiring
the user to change the acceleration or deceleration time settings. The Stall Prevention function can be set separately for
acceleration, operating at constant speeds, and deceleration.
n L3-01: Stall Prevention Selection during Acceleration
Stall Prevention during acceleration prevents tripping with overcurrent (oC), motor overload (oL1), or drive overload (oL2)
faults common when accelerating with heavy loads or short acceleration times.
L3-01 determines the type of Stall prevention the drive should use during acceleration.
No. Name Setting Range Default
L3-01 Stall Prevention Selection during Acceleration 0 to 2 <1> 1
<1> Setting 2 is not available for OLV/PM.
Setting 0: Disabled
No Stall Prevention is provided. If the acceleration time is too short, the drive may not be able to get the motor up to speed
fast enough, causing an overload fault.
Setting 1: Enabled
Enables Stall Prevention during acceleration. Operation varies depending on the control mode.
• V/f Control:
Acceleration is reduced when the output current value exceeds 85% of the level set to parameter L3-02 for a longer than the
time set to L3-27. The acceleration stops when the current exceeds L3-02. Acceleration continues when the current falls
below L3-02 for longer than the time set to L3-27.
1.8 L: Protection Functions
104 YASKAWA ELECTRIC SIEP YAIZ1U 03A YASKAWA AC Drive – Z1000 Programming Manual