Delta CP2000 Series User Manual

Chapter 12 Description of Parameter SettingsCP2000
12.1-06-3
Traditional over-voltage stall prevention
 Used for uncertain load inertia. When it stops under normal load, the over-voltage does not
occur during deceleration and fulfills the deceleration time setting. However, load regenerative
inertia may occasionally increase and does not trip due to over-voltage when decelerating to
stop. In this case, the drive automatically increases the deceleration time until it stops.
 Because of the motor load inertia, the motor may exceed the synchronous speed when the drive
decelerates; in this case, the motor becomes generator. If the motor load inertia is larger, or the
setting for drive’s decelerating time is too small, the motor regenerates energy to the drive, and
makes the DC bus voltage increase to the maximum allowable value. Thus, when traditional
over-voltage stall prevention is enabled, the drive does not decelerate further and maintains the
output frequency until the voltage drops below the setting value again.
 When the over-voltage stall prevention is enabled, the drive deceleration time is larger than the
setting time.
 When there is a problem with the deceleration time, this function is disabled. See below for
solution:
1. Increase the deceleration time properly.
2. Install a brake resistor (refer to Section 7-1 Brake Resistors and Brake Units Selection
Chart for details) to dissipate the heat, that is, the electrical energy regenerating from the
motor.
Smart over-voltage stall prevention
 Adopts closed-loop control and takes the setting for Pr.06-01 over-voltage stall prevention as
target command during acceleration, deceleration and constant speed. When the DC bus
voltage is higher than the stall prevention level, the controller increases the output frequency
gradually according to closed-loop response until the DC bus voltage drops below the stall
prevention level, and returns to target frequency based on the previous setting for deceleration
time when the DC bus voltage is lower than the stall prevention level. If the DC bus voltage is
still higher than the stall prevention level during the adjustment, the output frequency increases
to the maximum operation frequency (Pr.01-00).

Delta CP2000 Series Specifications

General

Output Voltage	0 ~ Input Voltage
Communication Interface	RS-485
Storage Temperature	-20°C to 60°C
Input Voltage	200-240V AC, 380-480V AC
Protection Functions	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short Circuit