Output Torque Detection Function - Mitsubishi Electric FR-A800 Series Instruction Manual

• If the inverter output current drops to zero, slippage due to gravity may occur, especially in a lift application, because the
motor torque is not generated. To prevent this, the Y13 signal can be output from the inverter to apply the mechanical brake
at zero current output.
• To use the Y13 signal, set "13 (positive logic) or 113 (negative logic)" in any of Pr.190 to Pr.196 (Output terminal function
selection) to assign the function to the output terminal.
• Use Pr.167 to select the inverter operation at the time when Y13 signal turns ON, whether the inverter output stops or the
inverter operation continues.
Pr.167 = "0"
Output
current
Pr.152
0[A]
OFF ON
Start signal
Zero current
detection time
(Y13)
∗ When the output is restored to the Pr.152 level, the Y13
signal is turned OFF after 0.1 s.
NOTE
• This function is enabled during online or offline auto tuning.
• The response time of the Y12 and Y13 signals is approximately 0.1 second. However, the response time varies according to
the load condition.
• When Pr.152 = "0", the zero current detection function is disabled.
• Changing the terminal assignment using Pr.190 to Pr.196 (Output terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
CAUTION
• The setting of the zero current detection level should not be too low, and the setting of the zero current detection time
should not be too long. Doing so may cause the signal for the zero current detection not to be outputted when the output
current is very low and the motor torque is not generated.
• A safety backup such as an emergency brake must be provided to prevent machines or equipment in hazardous
conditions even if the Zero current detection is used.
Parameters referred to
Online auto tuningpage 558
Offline auto tuningpage
Pr.190 to Pr.196 (Output terminal function

5.11.9 Output torque detection function

Magnetic flux Sensorless Magnetic flux Magnetic flux Sensorless Vector Sensorless
If the motor torque which reaches a specific value is detected, the relative signal is output.
The signal is useful for applying or releasing electromagnetic brake, etc.
Pr.
864
Torque detection
M470
• The Torque detection (TU) signal turns ON when the motor output torque reaches the value of torque set in Pr.864 or
higher. The TU signal turns OFF when the motor output torque drops lower than the set value.
• Pr.864 is not available under V/F control.
488
5. PARAMETERS
5.11 (M) Item and output signal for monitoring
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Pr.152
0.1s ∗
Time
OFF OFF
ON ON
Pr.153 Pr.153
Detection time Detection time
532, page 551
selection)page 473
Vector Vector PM PM PM
Name
150%
search engine
Initial value Setting range
0 to 400%
Description
Set a value of the torque at which the TU
signal turns ON.