YASKAWA CIMR-ZU A Series Programming Manual page 111

Settin 1 Enabled
When the DC bus voltage rises due to regenerative load, an overvoltage fault is prevented by decreasing the regenerative
torque limit and increasing the output frequency.
L 17 ar et DC Bus olta e or O er olta e Suppression and Stall Pre ention
Sets the target DC bus voltage level used by the overvoltage suppression function (L3-11 = 1), Intelligent Stall Prevention
during deceleration (L3-04 = 2).
No
Target DC Bus Voltage for Overvoltage Suppression
L3-17
<1> Values are specific to 200 V class drives. Double the value for 400 V class drives.
<2> This value is initialized when E1-01 is changed.
L 2 DC Bus olta e Ad ustment Gain
Determines the proportional gain used by overvoltage suppression (L3-11 = 1), Single Drive KEB 2 (L2-29 = 1), KEB Ride-
Thru 2 (H1- = 7A or 7B) ,and Intelligent Stall Prevention during deceleration (L3-04 = 2) to control the DC bus voltage.
This function is available in OLV/PM control mode.
Note:
No
L3-20
Ad ustment or Sin le Dri e EB 2 (L2 2
• Increase this setting slowly in steps of 0.1 if overvoltage or undervoltage occurs at the beginning of deceleration.
• Decrease this setting if there is a fair amount of speed or torque ripple.
Ad ustment or O er olta e Suppression
• Increase this setting slowly in steps of 0.1 if overvoltage suppression is enabled (L3-11 = 1) and a sudden increase in a
regenerative load causes an overvoltage fault.
• Decrease this setting if there is a fair amount of speed or torque ripple.
L 21 Accel/Decel ate Calculation Gain
Determines the proportional gain used by overvoltage suppression (L3-11 = 1), Single Drive KEB 2 (L2-29 = 1), and Intelligent
Stall Prevention during deceleration (L3-04 = 2) to calculate acceleration and deceleration rates.
No
L3-21
Ad ustment or Sin le Dri e EB 2 (L2 2
• Reduce L3-21 in steps of 0.05 if there is a fairly large speed or current ripple.
• Small reductions of L3-21 can help solve problems with overvoltage and overcurrent.
• Decreasing this setting too much can cause slow DC bus voltage control response and may also lengthen deceleration times
beyond optimal levels.
Ad ustment or O er olta e Suppression
• Increase this setting in steps of 0.1 if overvoltage occurs as a result of a regenerative load when overvoltage suppression is
enabled (L3-11 = 1).
• Decrease L3-21 in steps of 0.05 if there is a fairly large speed ripple when overvoltage suppression is enabled.
L 2 Motor Acceleration ime or Inertia Calculations
Sets the time to accelerate the motor from stop to the maximum speed at motor rated torque. 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).
This function is available in OLV/PM control mode.
Note:
No
L3-24 Motor Acceleration Time for Inertia Calculations
Make the calculations in the formula below:
Name
and Stall Prevention
Name
DC Bus Voltage Adjustment Gain
1) and Intelli ent Stall Pre ention Durin Deceleration
Name
Accel/Decel Rate Calculation Gain
1) and Intelli ent Stall Pre ention Durin Deceleration
Name
1 8 L Protection Functions
Settin an e
150 to 400 Vdc
Settin an e
0.00 to 5.00
Settin an e
0.00 to 200.00
Settin an e
0.001 to 10.000 s
De ault
370 Vdc
<1> <1> <2>
De ault
Determined by
A1-02
De ault
1.00
De ault
Determined by o2-04
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