YASKAWA OYMC V1000, Programming Manual

Page: 196 / 408

1.8 L: Protection Functions
196 YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual
back to speed when the power is restored.
KEB Related Adjustment Parameters
The KEB 1 functions can be adjusted using the following parameters:
• L2-05, Undervoltage Detection Level
• L2-06 or C1-09, KEB Deceleration Time or Fast Stop Time
• L2-07, KEB Acceleration Time
• L2-08, Frequency Gain at KEB Start
Use the following parameters when adjusting the KEB 2 function:
• L2-05, Undervoltage Detection Level
• L2-08, Frequency Gain at KEB Start
• L2-11, Desired DC Bus Voltage during KEB
• L3-20, Main Circuit DC Voltage Adjustment Gain
Sets the proportional gain for controlling the DC bus voltage and keeping it at the desired
level during KEB 2 operation.
• L3-21, Accel/Decel Rate Calculation Gain
Sets the gain used to calculate the acceleration or deceleration rate when KEB 2 is active.
• L3-24, Motor Acceleration Time
This value is used to estimate the regenerative power fed back from the mechanics to the
drive DC bus during KEB 2.
• L3-25, Load Inertia Ratio
This value is used to estimate the regenerative power fed back from the mechanics to the
drive DC bus during KEB 2.
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L2-06: KEB Deceleration Time (KEB 1 only)
Sets the time to decelerate from the frequency reference when the KEB command was input
down to zero speed. It can be used to decelerate different drives down to zero in the same
time and thereby keep a constant speed ratio.
When L2-06 is set to 0.0 s, the time set in parameter C1-09 (set for deceleration from
maximum frequency to zero) is used for the deceleration.
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L2-07: KEB Acceleration Time (KEB 1 only)
Sets the time to reaccelerate from the speed when KEB was deactivated to the frequency
reference. It can be used to accelerate different drives up to their frequency reference in the
same time and thereby keep a constant speed ratio.
When set to 0, the drive will accelerate back up to speed according to parameters C1-01
through C1-08 (set for acceleration from zero to maximum frequency).
No. Name Setting Range Default
L2-06 KEB Deceleration Time 0.0 to 200.0 s 0.0 s