5.3 Description of Function Codes 5.3.5 H codes (High performance functions)
Speed limits 1 and 2 (d32, d33)
Torque control mode controls the motor-generating torque directly, 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.
The speed limit levels can be set to forward or reverse individually.
• Forward speed limit level = Maximum frequency 1 (F03) x Speed limit 1 (d32) (%)
• Reverse speed limit level = Maximum frequency 1 (F03) x Speed limit 2 (d33) (%)
If switching between torque control and speed control, ensure that d35 ≠ 999. If the overspeed level is
not set, set to 120%. If d35 = 999, the overspeed level setting will be 1 or 2 under speed control, and an
overspeed OS will occur at 120% of the level set at d32 and d33.
Speed limiting “S-LIM” (E20 to E24, E27, data = 131)
If the motor speed reaches the speed limit value during torque control (H18 = 2, 3), “S-LIM” will turn ON during
speed limiting. Speed limiting (when H18 ≠ 2 or 3, or when torque control cancel signal “Hz/TRQ” = ON) will be
disabled (OFF).
Analog speed limit value (E61, E62, E63, and E66)
You can also enter from the analog input the speed limit value. Refer to E61, E62, E63, and E66 for details.
• Forward speed limit level = Maximum frequency 1 (F03) x FWD speed limit value (analog input) (%)
• Reverse speed limit level = Maximum frequency 1 (F03) x REV speed limit value (analog input) (%)
Over speed detection level (120% of the specified speed limit levels)
If a regenerative load (which is not generated usually) is generated under droop control or function codes are
incorrectly configured, then the motor may rotate at an unintended high speed. To protect the machinery, it is
possible to specify the overspeed level with d32 and d33 as follows.
• Forward overspeed level = Maximum frequency (F03/A01/b01/r01) x Speed limit 1 (d32) x 120 (%)
• Reverse overspeed level = Maximum frequency (F03/A01/b01/r01) x Speed limit 2 (d33) x 120 (%)
When performing speed control, d32 and d33 are used as the overspeed (OS) detection level for the forward rotation
side and reverse rotation side, respectively. If switching between torque control and speed control, use d35 if an
overspeed protection alarm (OS) occurs.
Running/stopping the motor
Under torque control, the inverter does not control the speed, so it does not perform acceleration or
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 it OFF
stops the inverter so that the motor coasts to a stop.
When starting torque control under sensorless vector control, the starting operation will differ depending
on whether function code (d67) auto search is enabled or disabled.
0: Disable
1: Enable (Only at restart after
momentary power failure)
When starting up, the motor starts from zero
frequency.
Acceleration starts based on the torque command.
When starting up, be sure to use with an application
that involves the motor stopping.
2: Enable (At normal start and at
restart after momentary power
failure)
When starting up, auto search is performed and
after finding the motor as it rotates, torque control
begins.
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