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SSI700 User Manual Description of Function Codes
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If the startup mode is pre-excited start (P6-00 = 3), the AC drive builds magnetic field
based on the set pre-excited current. After the pre-excited time, the AC drive starts to run.
If the pre-excited time is 0, the AC drive starts directly without pre-excitation.
The startup DC braking current or pre-excited current is a percentage relative to the base
value.
• If the rated motor current is less than or equal to 80% of the rated AC drive
current, the base value is the rated motor current.
• If the rated motor current is greater than 80% of the rated AC drive current, the
base value is 80% of the rated AC drive current.
Property
Default Setting Range
Parameter
Name
Function
Code
Group P6: Start/Stop Control
★
0
0: Linear acceleration/deceleration
1: S-curve acceleration/deceleration A
2: S-curve acceleration/deceleration B Acceleration/
Deceleration
mode
P6-07
It is used to set the frequency change mode during the AC drive start and stop process.
• 0: Linear acceleration/deceleration
The output frequency increases or decreases in linear mode. The SSI700 provides four
group of acceleration/deceleration time, which can be selected by using P4-00 to P4-08.
• 1: S-curve acceleration/deceleration A
The output frequency increases or decreases along the S curve. This mode is generally
used in the applications where start and stop processes are relatively smooth, such as
elevator and conveyor belt. P6-08 and P6-09 respectively define the time proportions of
the start segment and the end segment.
• 2: S-curve acceleration/deceleration B
In this curve, the rated motor frequency
b
f
is always the inflexion point. This mode is
usually used in applications where acceleration/deceleration is required at the speed
higher than the rated frequency.
When the set frequency is higher than the rated frequency, the acceleration/ deceleration
time is:
In the formula,
f
is the set frequency,
b
f is the rated motor frequency and
T
is the
acceleration time from 0 Hz to
b
f
.
Default Setting Range Parameter Name
Function
Code
Group P6: Start/Stop Control
30.0% 0.0% to (100.0% – P6-09) Time proportion of S-curve start segment P6-08
30.0% 0.0% to (100.0% – P6-08) Time proportion of S-curve end segment P6-09
These two parameters respectively define the time proportions of the start segment and
the end segment of S-curve acceleration/deceleration. They must satisfy the requirement:
P6-08 + P6-09
≤ 100.0%.
In Figure 6-12, t1 is the time defined in P6-08, within which the slope of the output
frequency change increases gradually. t2 is the time defined in P6-09, within which the
slope of the output frequency change gradually decreases to 0. Within the time between