Chapter 5 Function Introduction Shenzhen Hpmont Technology Co., Ltd.
―64― HD3N-TC Series Inverter User Manual V1.0
5.2.19 F25: Light Load High Speed Parameter
When present target frequency exceeds rated frequency of motor, group F25 can adjust the max.
output frequency according to present load, to avoid overcurrent or overload if the load is too heavy.
Ref. code Name Description Setting Range [Default]
F25.00 Flux weakening rate 0.0 - 300.0 [100.0%]
F25.01 Load basis 0,1 [1]
0: According to output current.
1: According to output torque.
F25.02 Rope slackening coefficient 0.0 - F25.03 [10.0%]
F25.03 Light load coefficient F25.02 - F25.04 [40.0%]
F25.04 Load tolerance F25.03 - 100.0 [80.0%]
F25.05 Detection frequency MAX (F24.02,F24.09) - F08.03
[40.00Hz]
F25.06 Detection time 0.0 - 5.0 [0.5s]
F25.07 UP amendment 0.0 - 100.0 [100.0%]
F25.08 DN amendment 0.0 - 100.0 [100.0%]
When target frequency of inverter
＞
rated frequency of motor (F08.03 / F13.04) and (F25.00)
＞
100%, light
load high speed function is enabled.
• When inverter receives starting command, it runs at F25.05, and finish time of F25.06. While within
F25.06, inverter calculates the max. output frequency that present running can reach according to
F25.01.
• Below is the formula within detection time:
• When actual load of inverter < rope slackening coefficient (F25.02) or > max. load (F25.04), max. output
frequency that is allowed: rated frequency of motor (F08.03 / F13.04).
• When rope slackening coefficient (F25.02) < Actual load < light load coefficient (F23.03), max. output
frequency that is allowed: flux weakening rate (F25.00)*rated frequency of motor.
• When F25.03 < Actual load < Max. load (F25.04), max. output frequency of inverter is interpolation.
Final output frequency is: max. frequency × F25.07 or max. frequency × F25.08.
F25.02
F25.00 ×
F08.03/F13.04
F08.03 / F13.04
F25.03 F25.04
Output load
utput frequency
Allowed max. frequency
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