YASKAWA OYMC V1000, Programming Manual

Page: 197 / 408

1.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual 197
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L2-08: Frequency Gain at KEB Start
When KEB 1 is activated, the output frequency is reduced in a single step in order to quickly
get the motor into a regenerative state. The amount of this frequency reduction can be
calculated using the following formula:
Amount of reduction = Slip frequency prior to KEB x (L2-08) x 2
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L2-11: Desired DC Bus Voltage during KEB
Sets the desired voltage in the DC bus during KEB 2 operation.
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L3: Stall Prevention
When the load is too high or acceleration and deceleration times are too short, the motor may
be unable to keep up with the frequency reference, resulting in excessive slip. This “stalling”
makes it impossible to decelerate or accelerate. The drive can prevent the motor from
stalling and still reach the desired speed without the user needing to change the acceleration
or deceleration time settings. The Stall Prevention function can be set separately for
acceleration, operating at constant speeds, and deceleration.
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L3-01: Stall Prevention During Acceleration Selection
Stall Prevention during acceleration is used when the motor loses speed during acceleration
due to a relatively large load. It prevents overcurrent and motor overload (OL1) from
occurring.
This parameter sets the Stall Prevention method for acceleration.
No. Name Setting Range Default
L2-07 KEB Acceleration Time 0.0 to 25.5 s 0.0 s
No. Name Setting Range Default
L2-08 Minimum Frequency Gain at KEB Start 0 to 300% 100%
No.
<1> Values are for 200 V class drives and must be doubled for 400 V class drives.
Name Setting Range Default
L2-11 Desired DC Bus Voltage during KEB 150 to 400 V
<1>
E1-01 x 1.22
No. Name Setting Range Default
L3-01 Stall Prevention Selection during Acceleration 0 to 2
<1>
1