IMO VXSM75-1 Instruction Manual page 49

F40 Torque limiter 1 (Driving)
F02 Torque limiter 1 (Braking)
•
The torque limiting operation calculates the
motor torque from the output voltage, current,
resistance of the primary winding of the motor
and other data to control the frequency so
that the calculated value does not exceed the
control value. This operation insures inverter
operation without tripping upon abrupt
changes in the load torque while the limit
value is maintained.
•
Select the limit values of the driving torque
and braking torque.
•
The acceleration/deceleration operation time
during activation of this function becomes
longer than the set acceleration/deceleration
time. When the driving torque is limited during
constant speed operation, the frequency is
lowered to reduce the load torque. (When the
braking torque is limited, the contrary occurs.)
Setting range: 20 to 200,999%
Set "999" to inactivate the torque limiter.
Set only the braking torque to "0" to
automatically avoid OU tripping caused by
power regeneration.
WARNING
If the torque limiter has been
selected, the inverter may operate at
an acceleration/deceleration time or speed
different from the set ones. Design the
machine so that safety is ensured even in
such cases.
Otherwise an accident could occur.
F02
Torque vector control 1
•
The torque vector control calculates the
torque suitable for the load to make the most
of the motor torque, and controls the voltage
and current vectors to optimum ones
according to the calculated value.
Setting State of operation
Inactive
–
Active
–
•
When "1" (active) is selected, the settings of
the following function codes become different
from the written ones.
1) F09 "Torque boost 1"
Works as "0" value (automatic torque boost).
2) P09 "Slip compensation control"
5-20
Slip compensation is automatically activated.
When "0" is set, the slip compensation
amount of a standard three-phase motor is
assumed. When the setting is other than "0",
the written setting is applied.
•
Use the torque vector control function under
the following conditions.
1) A single motor
If two or more motors are connected, vector
control is not possible.
2) The data of function codes of motor 1 (P03
"Rated current", P06 "No-load current", P07
"%R1" and P08 "%X") must be accurate Use
PO4, Auto tuning.
3) The rated motor current must not be much
smaller than the rated inverter current.
Though it depends on the model, the one
smaller by two ranks than the standard
applicable motor of the inverter is the
allowable smallest motor.
4) The wiring distance between the inverter
and motor must be up to 50 m. Too long a
wiring distance disables accurate control due
to the leakage current flowing through the
static capacitance between the cable and the
ground.
5) When a reactor is connected between the
inverter and the motor or when the wiring
impedance is too large to be overlooked,
change the data using P04 "Auto tuning".
If these conditions cannot be satisfied, leave
the setting at "0" (inactive).
Selecting Functions