Editing Regenerative resistor
Your changes will be displayed to readers once an authorized user accepts them. (help) |
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.
The edit can be undone.
Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
Latest revision | Your text | ||
Line 3: | Line 3: | ||
Servo drive with motor can act two ways: energy supply and energy generator. The generator behavior occurs during decelerations and this causes current flow from motor to drive power supply capacitors. If that generated energy is not absorbed anywhere, the voltage of capacitors will rise above overvoltage threshold and trigger an software clearable overvoltage fault. | Servo drive with motor can act two ways: energy supply and energy generator. The generator behavior occurs during decelerations and this causes current flow from motor to drive power supply capacitors. If that generated energy is not absorbed anywhere, the voltage of capacitors will rise above overvoltage threshold and trigger an software clearable overvoltage fault. | ||
− | {{tip|In most installations braking resistor is not needed at all. Resistor is needed in cases where fast moving motor with high inertial load is stopped rapidly causing conversion of the kinetic energy into electric current which needs to be dissipated by a resistor. Experimenting without resistor is safe as drive's overvoltage protection will prevent any damage occurring. If drive faults to overvoltage fault during deceleration, then try adjusting | + | {{tip|In most installations braking resistor is not needed at all. Resistor is needed in cases where fast moving motor with high inertial load is stopped rapidly causing conversion of the kinetic energy into electric current which needs to be dissipated by a resistor. Experimenting without resistor is safe as drive's overvoltage protection will prevent any damage occurring. If drive faults to overvoltage fault during deceleration, then try adjusting [[FOV]] to higher value or add a braking resistor.}} |
==Overvoltage faults== | ==Overvoltage faults== | ||
Line 12: | Line 12: | ||
<gallery widths="330px" heights="500px"> | <gallery widths="330px" heights="500px"> | ||
File:regeneration1.png|Voltage generation during deceleration of motor (motor current is negative, current is pumped to HV DC bus causing a 40 VDC rise). | File:regeneration1.png|Voltage generation during deceleration of motor (motor current is negative, current is pumped to HV DC bus causing a 40 VDC rise). | ||
− | File:regeneration2.png|Voltage generation during deceleration of motor (motor current is negative, current is pumped to HV DC bus). However, in this case drive is equipped with regenerative resistor and tightly set | + | File:regeneration2.png|Voltage generation during deceleration of motor (motor current is negative, current is pumped to HV DC bus). However, in this case drive is equipped with regenerative resistor and tightly set [[FOV]] parameter which prevents the significant voltage rise (only 5 VDC rise). |
File:regeneration3accel.png|Example of accelerating motor (motor current is positive, power is drawn from HV DC bus which is causing a temporary voltage drop). Rectified 50 Hz mains AC ripple is easily seen in the voltage graph. | File:regeneration3accel.png|Example of accelerating motor (motor current is positive, power is drawn from HV DC bus which is causing a temporary voltage drop). Rectified 50 Hz mains AC ripple is easily seen in the voltage graph. | ||
</gallery> | </gallery> | ||
Line 18: | Line 18: | ||
==See also== | ==See also== | ||
*[[Overvoltage and undervoltage faults]] - practical guide for sizing regenerative resistor | *[[Overvoltage and undervoltage faults]] - practical guide for sizing regenerative resistor | ||
− | |||
− |