Shenzhen Hpmont Technology Co., Ltd
Chapter 6 Function Introduction
HD20 Series Inverters User Manual
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99
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Protection of stall overvoltage (F19.18
－
F19.19)
During deceleration, the motor’s decelerate rate may be lower than that of the inverter’s output
frequency due to the load inertia. At this time, the motor will feed the energy back to the inverter,
resulting in voltage rise on the inverter's DC bus. If no measures taken, the inverter will trip due to
overvoltage.
No.
Name Description
Range
【
factory setting
】
F19.18
Protection of stall overvoltage
0,1
【
1
】
0: Disabled. The braking resistor is recommended to be installed if F19.18 is set to 0.
1: Enabled. During the deceleration, the inverter detects the bus voltage and compares it with the stall
overvoltage point defined by F19.18.
• If the detecting bus voltage exceeds F19.19 (stall overvoltage point), the inverter will stop reducing
its output frequency. When detect again, if the bus voltage becomes lower than F19.19, the
deceleration continues.
Note: If stall overvoltage lasts more than 1 minute, the inverter will alarm fault (E0007). And at this
time, the inverter stops output.
F19.19
Stall overvoltage point
0
－
999V
【
dependent on inverter
model
】
If the stall overvoltage point is set a little lower, deceleration time should be comparatively longer.
• Corresponding to input 380V bus voltage.
Auto current limiting function (F19.20
－
F19.22)
Auto current limiting function is used to limit the load current in real time smaller than the auto
current limiting threshold (F19.21). Therefore the inverter will not trip due to surge current. This
function is especially suitable for applications with big load inertia or big change of load.
In auto current limiting process, the inverter’s output frequency may change; therefore, it is
recommended not to enable this function when stable output frequency is required.
No.
Name Description
Range
【
factory setting
】
F19.20
Auto current limiting selection
0
－
2
【
1
】
0: Disabled.
1: Enabled in acceleration/deceleration operating process, but disabled in constant speed operating
process.
2: Enabled both in acceleration/deceleration operating process and in constant speed operating process.
• When the auto current limiting function is enabled, the output overload capacity will impaired if auto
current limiting threshold is set too low.
F19.21
Auto current limiting threshold
20.0
－
200.0
【
150%
】
F19.21 defines the threshold of auto current limiting. It is a percentage of the inverter’s rated current.
F19.22
Deceleration time at auto current limiting
0.00
－
600.00
【
10.00s
】
F19.22 defines the speed rate for the output frequency adjustment at auto current limiting action.
• If the setting is too small, it will not be easy to over the auto current limiting status and finally result in
overload fault.
• If the setting is too big, the frequency will change too sharply and therefore, the inverter may be in
generating status for a long time, which may result in overvoltage protection.
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