Delta CT2000 Series User Manual page 288

06 Protection Parameters
Low Voltage Level

Settings Frame A to D:
 It is used to set the Lv level. When the drive is in the low voltage, it will stop output and free to stop.
Over-voltage Stall Prevention

Settings
 When Pr.06-01 is set to 0.0, the over-voltage stall prevention function is disabled.
 During deceleration, the DC bus voltage may exceed its Maximum Allowable Value due to motor
regeneration. When this function is enabled, the AC motor drive will not decelerate further and
keep the output frequency constant until the voltage drops below the preset value again.
 This function is used for the occasion that the load inertia is unsure. When it stops in the normal
load, the over-voltage won't occur during deceleration and fulfill the setting of deceleration time.
Sometimes, it may not stop due to over-voltage during decelerating to stop when increasing the
load regenerative inertia. At this moment, the AC drive will auto add the deceleration time until drive
stop.
 When the over-voltage stall prevention is enabled, drive deceleration time will be larger than the
setting.
 When there is any problem as using deceleration time, refer to the following items to solve it.
1. Add the suitable deceleration time.
2. Add brake resistor (refer to appendix B-1 for details) to consume the electrical energy that
regenerated from the motor with heat type.
 Related parameters: Pr.01-13, 01-15, 01-17, 01-19 (settings of decel. time 1~4), Pr.02-13~02-14
(Multi-function Output 1 RY1, RY2), Pr. 02-16~02-17 Multi-function Output (MO1, 2)
Chapter 12 Description of Parameter SettingsCT2000 Series
460V Series: 300.0~440.0V
Frame E and frames above E: 380.0~440.0V
input voltage
Pr. 06-00
460V Series:0.0~900.0V
0: Disabled
12.1-06-1
 This parameter can be set during operation.
30V(60V)
LV
Factory Setting: 760.0
Factory Setting:
360.0
400.0