Fuji Electric Frenic Mega Series - Page 369

5.4 Details of Function Codes
5-188
 Cancel torque control signal - Hz/TRQ (Function Code E01 to E09, Data = 23)
When torque control is enabled (H18 = 2 or 3), switching between speed control and torque control is
possible by setting data = 23 (torque control cancel) to the general-purpose digital input.
Table 5.4-120
Cancel torque control signal Hz/TRQ Operation
ON
Cancel torque control (Enable speed control)
OFF
Enable torque control
 Torque control (Speed limit 1, 2) (d32, d33)
Torque control controls the motor-generating torque, not the speed. The speed is determined secondarily by
torque of the load, inertia of the machinery, and other factors. To prevent a dangerous situation, therefore,
the speed limit functions (d32 and d33) are provided inside the inverter.
There are cases that the motor unexpectedly starts rotating in high speed due to the regenerative
load in droop control (which is not generated usually) or due to the incorrect setting of the function
code. In order to protect the machinery, the overspeed level can be freely set.
- Forward overspeed level = Maximum output frequency (F03) x Speed limit 1 (d32) x 120 (%)
- Reverse overspeed level = Maximum output frequency (F03) x Speed limit 2 (d33) x 120 (%)
Running/stopping method
Under torque control, the inverter does not control the speed, so it does not perform acceleration o
r
deceleration by soft-start and stop (acceleration/deceleration time) at the time of startup and stop.
Turning on a run command starts the inverter to run and output the commanded torque. Turning of
f
a run command stops the inverter so that the motor coasts to a stop.
At the start of torque control under the "Vector control without a sensor," the starting operation
differs depending upon whether auto search is enabled or disabled by the function code d67 as
shown below.
Table 5.4-121
Data for d67 Operation
0: Disable
1: Enable (Only at restart
after momentary power
failure)
At startup, the inverter starts from zero frequency. Then it
accelerates according to a torque command. Select this
operation for use in which the motor is surely stopped before
startup.
2: Enable (At normal start
and at restart after
momentary power
failure)
At startup, auto searches for idling motor are executed, and the
torque control starts.