YASKAWA V1000 Series Technical Manual page 194

5.8 L: Protection Functions
Setting
2 Decelerates at Decel Time 2 (C1-04)
• L3-05 = 0
Disabled. Drive runs a set frequency. A heavy load may cause the drive to trip on an OC or OL fault.
• L3-05 = 1
In order to avoid stalling during heavy loading, the drive will decelerate at Decel Time 1 (C1-02) if the output current exceeds the level set by L3-06.
Once the current level drops below the L3-06 level for 100 ms, the drive will accelerate back to its frequency reference at the active acceleration rate.
• L3-05 = 2
Same as setting 1 except the drive decelerates at Decel Time 2 (C1-04). When output frequency is 6Hz or less, stall prevention during run is disabled
regardless of the setting in L3-05.
L3-23: Automatic Reduction Function Selection for Stall Prevention during Run
n
No.
L3-23 Automatic Reduction Function Selection for Stall Prevention during Run
Note: When L3-23 = 0, the Stall Prevention level during run becomes the value set to L3-06. When L3-23 = 1, the Stall Prevention level during run is automatically reduced in the
constant output range. The lower limit value becomes 40% of L3-06.
L3-11: OV Suppression Function Selection
n
Suppresses voltage in the DC bus to prevent an OV fault from occurring when a regenerative load is added.
No.
L3-11
*Motor speed will exceed the frequency reference when overvoltage suppression is triggered from an increase in a regenerative load. Consequently,
overvoltage suppression is not appropriate in applications that require a perfect match between the frequency reference and the actual motor speed. Disable
overvoltage suppression when using a braking resistor. Overvoltage may still occur if there is a sudden increase to a regenerative load.
• L3-11 = 1 (enabled)
When there in an increase to a regenerative load, this function prevents overvoltage from resulting by increasing the output frequency. It suppresses
the DC bus voltage as well as keeps it within the desired level set to L3-17. Be aware that the motor can speed up while OV suppression is operating.
This function is helpful in punch press applications, in addition to motoring and regenerative applications that involve repetitive crank movement.
Overvoltage suppression is adjusted with other parameters, including DC bus voltage gain (L3-20), deceleration rate calculations gain (L3-21), inertia
calculations for motor acceleration time (L3-24), and the load inertia ratio (L3-25).
Note: Not for use with applications in where the motor speed and frequency reference must be exactly the same. Disable this settings when using a braking resistor. Overvoltage may
occur even when this function is enabled if there is a sudden increase to a regenerative load. This function is enabled only when operating just below the maximum frequency
reference and there is an increase to a regenerative load.
L3-17: Overvoltage Suppression and Deceleration Stall and Desired DC Bus Voltage during Motor Stall
n
No.
Overvoltage Suppression and Deceleration Stall and Desired DC Bus
L3-17
*1. Double this value when using a 400 V class unit.
*2. This value is initialized when E1-01 is changed.
Note: This parameter is enabled when overvoltage suppression selection is also enabled (L3-11 = 1), and also when Stall Prevention during deceleration is set for automatic adjustment
(L3-04 = 2). This setting rarely needs to be changed.
L3-20: Main Circuit Voltage Adjustment Gain
n
Determines the proportional gain for suppressing DC voltage to the desire levels (L3-11 = 1) when KEB Ride-Thru 2 or automatic adjustments for Stall
Prevention during deceleration is enabled.
No.
L3-20
Note: If overvoltage or undervoltage (UV1) occurs at the beginning of deceleration while KEB Ride-Thru 2 is enabled or while intelligent, automatic adjustment is set for Stall
Prevention during deceleration, try increasing this setting slowly in increments of 0.1. If this setting is too high, then a fair amount of speed or torque ripple can result. If
overvoltage suppression is enabled (L3-11 = 1) and there is a sudden increase in a regenerative load, overvoltage may still result. To counteract this problem, try increasing
this setting in increments of 0.1. Note that a fair amount of speed or current ripple may result if set too high.
L3-21: Accel/Decel Rate Calculation Gain
n
Determines the proportional gain used in calculating acceleration and deceleration in order to keep DC bus voltage within the desired range when
overvoltage supression is enabled (L3-11 = 1) for KEB Ride-Thru 2 and intelligent Stall Prevention during deceleration (L3-04 = 2).
No.
L3-21
*Reset to its default value when the control mode is changed (A1-02). The value shown here is for Open Loop Vector Control.
Note: The gain for the acceleration calculations may need to be reduced in small increments of 0.05 if there is a fairly large speed or current ripple during KEB Ride-Thru 2 or when
using the automatic, intelligent adjustment feature in Stall Prevention during deceleration. Small reductions in the acceleration gain can also help solve problems with overvoltage
and overcurrent. Be careful not to decrease this setting too much, as that may result in too slow of a response in controlling DC bus voltage and may also slow deceleration
times beyond optimal levels. Increase this setting in small increments of 0.1 if overvoltage occurs as a result of a regenerative load when overvoltage suppression is enabled
(L3-11 = 1). If there is a fairly large speed ripple when overvoltage suppression is enabled, then slowly decrease L3-21 in increments of 0.05.
194
Name
Name
OV Suppression Function Selection
Name
Voltage during Motor Stall
Name
Main Circuit Voltage Adjustment Gain
Name
Accel/Decel Rate Calculation Gain
Description
Setting Range
0: Disabled
1: Enabled
Setting Range
0: Disabled
1: Enabled*
Setting Range
150 to 400 *1
Setting Range
0.00 to 5.00
Setting Range
0.00 to 200.00
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
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