Omron SYSDRIVE MX2 SERIES User Manual page 140

5-2 Basic Functions
Take note that, as shown in the figure, the actual acceleration/deceleration time becomes
shorter than the set acceleration/deceleration time depending on the set values of maximum
frequency, output frequency and starting frequency.
Output frequency
Maximum
Frequency
A004/A204
Starting
Frequency
b082
RUN command
FW input
No matter how shot the acceleration/deceleration time is set, the actual acceleration/
deceleration time cannot be shorter than the minimum acceleration/deceleration time
determined by the mechanical inertia J and the motor torque. If you set a time shorter than the
minimum acceleration/deceleration time, an overcurrent (OC) or overvoltage (OV) trip may
occur.
The calculations of the minimum acceleration/deceleration time are as follows. Use as a
5
reference.
Acceleration time T
t
=
S
Deceleration time T
T
=
B
5-25
Real
acceleration time
F002/F202
S
×
( J J ) N
+
L M M
×
9.55 ( − )
T T
S L
B
×
( J J ) N
+
L M M
×
( )
9.55 T + T
B L
Output Frequency
Setting (F001)
Real
Time
deceleration time
F003/F203
J
: Motor-shaft converted load J (kg
L
2
J
: Motor load J (kg m )
•
M
N
: Motor rotation speed (r/min)
M
T : Maximum acceleration torque based on inverter drive (N
S
T
: Maximum deceleration torque based on inverter drive (N
B
T : Required running torque (N
L
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
When the LAC input is turned ON,
the acceleration/deceleration time
becomes 0.01 s.
Output
frequency
FW input
LAC input
2
m )
•
m)
•
m)
•
m)
•