Omron VARISPEED L7 User 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 Standard Short Floor Advanced Short Floor
During Acceleration
Leveling Signal before 40% of the nominal speed
has been reached
Leveling speed signal before V
Opt
is reached
Leveling Signal after 40% of the nominal speed has
been reached.
Leveling speed signal after V
Opt
has been reached
v
Nominal
V
Leveling
f
out
Leveling
command
40% x
V
Nominal
S3-20
V
Nominal
V
Opt
V
Leveling
f
out
Leveling
command
v
Nominal
V
Leveling
f
out
Leveling
command
40% x
V
Nominal
V
Nominal
V
Opt
V
Leveling
f
out
Leveling
command
Optimal speed profile
(S2-20 calculated)

Omron VARISPEED L7 Specifications

General

Brand	Omron
Model	VARISPEED L7
Category	Inverter
Language	English