Motor Controllers AC Variable Frequency Drives
RVBS
Specifications are subjected to change without notice.10/08/2021
21
-
F07 specifies the acceleration time, the length of time the frequency increases from 0 Hz to the
maximum frequency.
-
F08 specifies the deceleration time, the length of time the frequency decreases from the maximum
frequency down to 0 Hz.
➢
Selecting an S-shaped pattern with function code H04 (Acceleration/deceleration pattern) makes the
actual acceleration/deceleration times longer than the specified ones. Refer to the paragraph 2.2.6
“S-curve acceleration/deceleration”.
➢
Specifying an improperly short acceleration/deceleration time may activate the current limiter or anti-
regenerative control, resulting in a longer acceleration/ deceleration time than the specified one.
< Speed profile with linear acceleration/deceleration >
Function
Code
Mod.
add.
Description
Def
Min
Max
U.M.
R/W
F07
0x0007
Acceleration Time 1
500
1
65500
0.01Sec.
R/W
F08
0x0008
Deceleration Time 1
500
1
65500
0.01Sec.
R/W
4.2.4.2
Start/Stop
At the startup of an RVBS, the initial output frequency is equal to the starting frequency 1 specified by F18.
The inverter stops its output when the output frequency reaches the stop frequency specified by F20.
Set the starting frequency to a level at which the motor can generate enough torque for startup. Generally,
set the motor's rated slip frequency as the starting frequency. In addition, to compensate for the delay time for
the establishment of a magnetic flux in the motor, F19 specifies the holding time for the starting frequency. To
stabilize the motor speed at the stop of the motor, F23 specifies the holding time for the stop frequency.
➢
If the starting frequency is lower than the stop frequency, the inverter will not output any power as
long as the reference frequency does not exceed the stop frequency.
