Danfoss VFD500 Series Manual page 54

VFD500 high performance vector control frequency inverter user manual
Function
Parameter name
code
DC braking is used to make the running motor stop & restart. Pre-excitation is used to establish
asynchronous motor magnetic field, then start, improve the response speed.
DC braking is only valid when start directly, the inverter performs DC braking according to
P02-06 firstly, and runs after P02-07. If DC braking time is 0, the inverter starts directly. The
bigger the DC braking current is, the greater the braking force
If the start mode is pre-excitation start, then the inverter establishes magnetic field according to
the set pre-excitation current firstly, runs after the set pre-excitation time. If the pre-excitation
time is 0, the inverter starts directly.
DC braking current before start/pre-excitation current refers to the percentage of the inverter
rated current.
P02.08 Stop method
Startup frequency of DC
P02.09
brake at stop
DC braking current at
P02.10
stop
P02.11 DC brake time at stop
Description
0：ramp to stop
after the stop command becomes
valid, the inverter decelerates to reduce
the outputfrequency during the set time.
When the frequency
decreases to 0Hz, the inverter stops.
1：free coast to stop
after the stop command becomes valid,
the inverter ceases the output
immediately. And the load coasts
to stop at the mechanical inertia.
0.00Hz～50.00Hz
start the DC braking when running
frequency reaches starting frequency
determined by P02.09.
0～200% motor rated current(Maximum value
not higher than drive rated current)
the value of P02.10 is the percentage of
rated current of inverter. The bigger the
DC braking current is, the greater the
braking torque isDC braking time: the
retention time of DC braking. If the
time is 0, the DC braking is invalid. The
inverter will stop at the set deceleration
time.
0.000s～30.000s
Inverters blocks the output before
starting the DC braking. After this
waiting time, the DC braking will be
started so as to prevent over-current
fault caused by DC braking at high
speed.
51
Chapter 5 function code table
Default Property
☆
0
★
1.00Hz
☆
100%
★
0.000s