6 Vector Control and Applied Functions
Multi-function Compact Inverter 3G3MX2-EV2 User’s Manual (I666-E1)
6-2 Torque Limit Function
6-2-1 Torque Limit Function Settings
Use the torque limit function to limit the output torque of motor.
This function is enabled only when the 1st/2nd Control Method (A044/A244) is set to 03 (Sensorless
vector control).
•
The Torque Limit Selection (b040) provides four modes as shown below.
Four-quadrant separate
setting mode (b040 = 00)
Use this mode to set the four-quadrant (Forward Power Running, Reverse Regen-
eration, Reverse Power Running, and Forward Regeneration) torque limits in the
Torque Limit 1 to 4 (b041 to b044).
Terminal switching mode
(b040 = 01)
Use this mode to switch the Torque Limit 1 to 4 (b041 to b044) setting based on
the combination of the torque limit switching functions 1 and 2 (TRQ1 and TRQ2)
allocated to multi-function input terminals.
The selected torque limit value is enabled for all RUN modes.
Analog input mode
(b040 = 02)
Use this mode to set the torque limit value based on the analog voltage applied to
the terminal O of the control circuit terminal block.
0 to 10 V is equivalent to the torque limit value of 0% to 200%. The torque limit
value set via the analog input terminal is enabled for all RUN modes.
Use this mode to set the torque limit value from optional equipment. At present,
OMRON provides no options that support this mode.
•
Setting one of the Multi-function Input 1 to 7 Selection (C001 to C007) to 40 (TL: Torque limit
enabled) enables the torque limit function set in the Torque Limit Selection (b040) only when the ter-
minal TL is input.
When this terminal is reset, the torque limit setting is disabled and the inverter uses the maximum
value (200%) as the torque limit value.
When the Torque limit enabled (TL) function is not allocated to any of the multi-function input termi-
nals, the torque limit function set in the Torque Limit Selection (b040) is always enabled.
•
The torque limit function regards the torque value equivalent to the rated output current of the inverter
as 100%.
To convert it to the rated motor torque ratio, use the following formula:
Rated motor torque ratio = [Torque limit set value] [Rated output current of Inverter] / [Rated
motor current]
•
When the Multi-function Output 11/12 Selection (C021/C022), or Multi-function Relay Output (AL1,
AL2) Function Selection (C026) is set to 10 (TRQ: Torque limit), you can check if the torque limit
func- tion is activated with the status of the torque limit signal.
00: Four-quadrant separate setting
01: Terminal switching
02: Analog voltage input
03: Option (No applicable Option)
Torque Limit 1
(Four-quadrant Mode For-
ward Power Running)
0. to 200.
255: no (Torque limit disabled)
Forward Power Running torque limit
when b040 = 00
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