5.Description of Function Codes
EM15 User's Manual
38
complete.
b0-19
Base frequency for UP/ DOWN modification during running
Default
0
Setting
Range
0
Running frequency
1
Setting frequency
This parameter is valid only when the frequency source is digital setting.
It is used to set the base frequency to be modified by using keys and or the terminal UP/DOWN function. If
the running frequency and setting frequency are different, therewill be a large difference between the frequency
inverter's performance during the acceleration/ deceleration process.
b0-20
Acceleration/Deceleration mode
Default
0
Setting
Range
0
Linear acceleration/ deceleration
1
S-curve acceleration/deceleration A
2
S-curve acceleration/deceleration B
It is used to set the frequency changing mode during the frequency inverter start and stop process.
0: Linear acceleration/deceleration
The output frequency increases or decreases in linear mode. The EM15 provides four groups of
acceleration/deceleration time, which can be selected by using multi-function DI terminals (b3-00 to b3-11).
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 required relatively smooth, such as elevator and conveyor belt. The b0-23 and b0-24
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 fb is always the inflexion point of S curve. This mode is usually used in
applications where acceleration/deceleration is required at the speed higher than the rated frequency.
Diagram 5-2 S-curve acceleration/deceleration B diagram
b0-21
Acceleration time 1
Default
Model dependent
Setting Range
0.00s~650.00s (b0-25 = 2)
0.0s~6500.0s (b0-25 = 1)
0s~65000s (b0-25 = 0)
b0-22
Deceleration time 1
Default
Model dependent
Setting Range
0.00s~650.00s (b0-25 = 2)
0.0s~6500.0s (b0-25 = 1)
0s~65000s (b0-25 = 0)
Acceleration time indicates the time required by the frequency inverter to accelerate from 0 Hz to "Acceleration /
Deceleration base frequency" (b0-26), that is, t1 in Diagram 6-3. Including, f is setting frequency, fb is motor rated
frequency, T is the acceleration time from 0 Hz to rated frequency fb.
Deceleration time indicates the time required by the frequency inverter to decelerate from "Acceleration /
Deceleration base frequency" (b0-26) to 0 Hz, that is, t2 in Diagram 6-3.
