YASKAWA CIMR-ZU A Series Programming Manual page 106

1 8 L Protection Functions
No
L2-07
L2 8 Fre uency Gain at EB Start
When the KEB Ride-Thru command is input, the output frequency is reduced in a single step to quickly get the motor into a
regenerative state. Calculate the amount of this frequency reduction using the formula below. L2-08 can only be used with
induction motors.
Amount of reduction = Slip frequency prior to KEB × (L2-08/100) × 2
No
L2-08
L2 1 EB Detection ime (Minimum EB ime)
Determines the duration of KEB Ride-Thru operation after it is triggered.
No
L2-10
L2 11 DC Bus olta e Setpoint durin
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
L2-11
<1> Values are specific to 200 V class drives. Double the value for 400 V class drives.
L2 2 EB Met od Selection
Selects the way the Kinetic Energy Buffering function operates.
If a multi function input is set for Single KEB Ride-Thru 2 (H1-
Note:
to L2-29 = 1 is automatically selected.
No
L2-29
Settin Sin le Dri e EB ide
Settin 1 Sin le Dri e EB ide
L Stall Pre ention
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.
L 1 Stall Pre ention Selection durin 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
L3-01
<1> Setting 2 is not available for OLV/PM.
1
Name
KEB Acceleration Time
Name
Frequency Gain at KEB Start
Name
KEB Detection Time
Name
DC Bus Voltage Setpoint during KEB
Name
KEB Method Selection
ru 1
ru 2
Name
Stall Prevention Selection during Acceleration
EB
= 7A, 7B), the setting of L2-29 is disregarded and the KEB mode equal
Settin an e
0.00 to 6000.0 s
Settin an e
0 to 300%
Settin an e
0 to 2000 ms
Settin an e
Determined by
150 to 400 Vdc
<1>
Settin an e
0, 1
Settin an e
0 to 2
<1>
De ault
0.00 s
De ault
100%
De ault
50 ms
De ault
E1-01
De ault
0
De ault
1