Chapter 5 Function parameter
69
state.
The hold time for start frequency is inactive when switching between forward rotation and
reverse rotation The hold time for start frequency is not included in the acceleration time, but
the simple PLC run-time.
Example 1:
F0.03＝0 the frequency source is set to digital reference
F0.01＝2.00Hz the digital set frequency is 2.00Hz
F3.03＝5.00Hz the start frequency is 5.00Hz
F3.04＝2.0s the hold time for start frequency is 2.0s, at this time, the inverter will be in the
standby state with the output frequency of 0.00Hz.
Example 2:
F0.03＝0 the frequency source is set to digital reference
F0.01＝10.00Hz the digital set frequency is 10.00Hz
F3.03＝5.00Hz the start frequency is 5.00Hz
F3.04＝2.0s the hold time for start frequency is 2.0s
At this point, the inverter accelerates to 5.00Hz for 2.0s, and then accelerates to the
reference frequency of 10.00Hz.
Start DC braking, generally is used to stop and then restart the motor. Pre-excitation is used
to create magnetic field for asynchronous motor and then start the motor to improve the
response speed.
Start DC braking is only active when the start mode is the direct startup. The inverter
firstly performs DC braking at the set start DC braking current, after the start DC braking time
is passed, and then start running. If the DC braking time is set to 0, the inverter will directly
start and neglect DC braking. The larger DC braking current, the greater braking force.
If the startup mode is the asynchronous motor pre-excitation start, the inverter firstly
creates magnetic field at the preset pre-excitation current, after the set pre-excitation time is
passed and then start running. If the pre-excitation time is set to 0, the inverter will directly start
and neglect pre-excitation.Start DC braking current/pre-excitation current is the percentage of
inverter rater current.
0:deceleration parking ；1:free stop
Initial frequency of stop DC
braking
0.00Hz～F0.19(Maximum
frequency)
Waiting time of stop DC
braking
Initial frequency of stop DC braking: if the operating frequency is reduced to the initial
frequency when decelerating, DC braking process is started.
Waiting time of stop DC braking: if the operating frequency is reduced to the said initial
frequency, the inverter firstly stops output for some time, and then DC braking process is
started. In order to prevent overcurrent fault that DC braking may cause at the higher speeds.
Stop DC braking current: it indicates the percentage of the DC braking output current in
the rated motor current. The larger this value, the stronger the DC braking effect, but the greater
the heat of the motor and the inverter.
Stop DC braking time: If this value is 0, DC braking process is canceled. Please see the
schematic diagram for the DC braking process.
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