Short Floor Operation - Omron VARISPEED L7 Manual

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Short Floor Operation

The short floor operation is activated if the leveling speed command is set before the nominal speed was
reached. The L7 inverter supports 2 methods of short floor operation:
Simple short floor operation which can be enabled by setting S3-01 = 1.
When the leveling speed input is set and the reached speed is higher than 40% of the nominal speed, the
inverter decelerates to 40% and keeps this speed for a calculated time before it decelerates to the leveling
speed and finally stops. If the reached speed is below 40% of the nominal speed, the inverter accelerates to
40% speed and keeps it for a calculated time before it decelerates to the leveling speed.
If the leveling input is set during constant speed run and the speed reference is lower than 40% of the nom-
inal speed, the speed is hold for a calculated time in order to minimize the leveling distance. If the speed
reference is higher than 40% but lower than the nominal speed, the speed is decreased to t 40% first, is
hold for a calculated time an then decreased to the leveling speed.
Advanced short floor operation which can be enabled by setting S3-01 = 2.
If the leveling speed command is set the inverter calculates the optimal speed using the speed reference,
two gain factors (S3-21/22) and a time constant (S3-20). If the leveling input is set before the optimal
speed has been reached, the inverter accelerates to the optimal speed and keeps it for the time constant S3-
20. If the leveling input is set when the optimal speed was exceeded, the inverter keeps the reached speed
for a certain time before it decelerates to the leveling speed.
The table below shows the behavior of the short floor functions under different conditions.
Condition
Leveling Signal before 40% of the nominal speed
f
out
Leveling
command
During Acceleration
Leveling Signal after 40% of the nominal speed has
f
out
Leveling
command
Standard Short Floor
has been reached
v
Nominal
40% x
V
Nominal
V
Leveling
been reached.
v
Nominal
40% x
V
Nominal
V
Leveling
Advanced Short Floor
Leveling speed signal before V
S3-20
f
out
Leveling
command
Leveling speed signal after V
Opt
f
out
Leveling
command
is reached
Opt
V
Nominal
V
Opt
6
V
Leveling
has been reached
V
Nominal
V
Opt
Optimal speed profile
(S2-20 calculated)
V
Leveling
17
6-

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