CHAPTER 12: DESCRIPTION OF PARAMETER SETTINGS
175 63-4528—04
06 Protection Parameters ~ The parameter can be set during operation
• It is used to set the Lv level. When the drive is in the low voltage, it will stop output and free to stop.
• When the setting is 0.0, the over-voltage Stall prevention is disabled.
• During deceleration, the DC bus voltage may exceed its Maximum Allowable Value due to motor regeneration. When this
function is enabled, the VFD 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 VFD will auto add the deceleration time
until drive stops.
• 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)
a
06 - 00 Low Voltage Level
Factory Setting: 180.0/360.0
Settings 230V models: 160.0~220.0V
460V models: 320.0~440.0V
a
06 - 01 Over-voltage Stall Prevention
Factory Setting: 380.0/760.0
Settings 230V models: 350.0~450.0V
460V models: 700.0~900.0V
0: Disable this function
M33665
LV
INPUT VOLTAGE
30V (60V)
PR.06-00
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