Detection Of Output Torque (Tu Signal, Pr. 864) - Mitsubishi Electric FR-A720-0.4K Instruction Manual
Fr-a700 series
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- Instruction manual (235 pages)
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Function assignment of external terminal and control
Output
current
Pr.152
0[A]
OFF
Start signal
Zero current
detection time
(Y13)
* Once turned on, the zero current detection time
signal (Y13) is held on for at least 100ms.
CAUTION
⋅ This function is also valid during execution of the online or offline auto tuning.
⋅ The response time of Y12 and Y13 signals is approximately 350ms.
⋅ When terminal assignment is changed using Pr. 190 to Pr. 196 (output terminal function selection), the other functions may be
affected. Please make setting after confirming the function of each terminal.
The zero current detection level setting should not be too high, and the zero current detection time setting not
too long. Otherwise, the detection signal may not be output when torque is not generated at a low output
current.
To prevent the machine and equipment from resulting in hazardous conditions by use of the zero current
detection signal, install a safety backup such as an emergency brake.
♦ Parameters referred to ♦
Online auto tuning
Offline auto tuning
Pr. 190 to Pr. 196 (output terminal function selection)
4.15.8 Detection of output torque (TU signal, Pr. 864)
Output the signal when the motor torque rises above the setting value.
Pr.863
This function can be used for electromagnetic brake operation, open signal, etc.
page 116
Pr.865
Parameter
page 235
Number
864
Torque detection
Pr.864
TU
CAUTION
⋅ When terminal assignment is changed using Pr. 190 to Pr. 196 (output terminal function selection), the other functions maybe
affected. Please make setteing after confirming the function of each terminal.
♦ Parameters referred to ♦
Pr. 190 to Pr. 196 (output terminal function selection)
238
Pr.152
100ms
*
ON
OFF
OFF
ON
ON
Pr. 153
Pr. 153
Detection time
Detection time
Refer to page 191
Refer to page 181
Name
ON
OFF
(2) Zero current detection (Y13 signal, Pr. 152, Pr.
153)
⋅ If the output current remains lower than the Pr. 152 setting
during inverter operation for longer than the time set in Pr.
153, the zero current detection (Y13) signal is output from
Time
the inverter's open collector or relay output terminal.
⋅ When the inverter's output current falls to "0", torque will not
be generated. This may cause a drop due to gravity when
the inverter is used in vertical lift application. To prevent this,
the Y13 signal can be output from the inverter to close the
mechanical brake when the output current has fallen to
"zero".
⋅ Set "13 (positive logic)" or "113 (negative logic)" in any of Pr.
190 to Pr. 196 (output terminal function selection) to assign the
function of the Y13 signal to the output terminal.
CAUTION
Refer to page 228
Initial Value
Setting Range
150%
0 to 400%
⋅ When the output torque reaches or exceeds the
detected torque value set in Pr. 864 under real sensor-
less vector control, advanced magnetic flux vector
control, or vector control, the torque detection signal
(TU) turns on.
It turns off when the torque falls below the detection
torque value.
⋅ For the TU signal, set "35 (positive logic) or 135 (neg-
Time
ative logic)" in Pr. 190 to Pr. 196 (output terminal function
selection) and assign functions to the output terminal.
Refer to page 228
Sensorless
Sensorless
Sensorless
Magnetic flux
Magnetic flux
Magnetic flux
Vector
Vector
Vector
Description
Set the torque value where the TU sig-
nal turns on.
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