Mitsubishi Electric 800 Series Instruction Manual page 309

 Zero current detection (Y13 signal, Pr.152, Pr.153)
• If the inverter output during inverter running remains lower than the Pr.152 setting for the time set in Pr.153 or longer, the
Zero current detection (Y13) signal is output.
• Once turned ON, the zero current detection time signal (Y13) is held ON for at least 0.1s.
• If the inverter output current decreases, slippage due to gravity may occur, especially in a lift application, because the
motor torque decreases. To prevent this, the Y13 signal can be output from the inverter to apply the mechanical brake
when the output current falls below the Pr.152 setting.
• For 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.
• Select whether the inverter output stops or the inverter operation continues when Y13 signal turns ON, by setting Pr.167.
Pr.167 = "0"
Output
current
Pr.152
Pr.152
0 [A]
OFF ON
Start signal
OFF
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
• The signals are enabled even when online or offline auto tuning is being executed.
• The response time of the Y12 and Y13 signals is approximately 0.1 s. Note that the response time varies with the load.
• When Pr.152 = "0", detection 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 zero current detection level setting should not be too low, and the zero current detection time setting not too long. When the output
current is low and torque is not generated, the detection signal may not be output.
• Even when using the zero current detection signal, a safety backup such as an emergency brake must be provided to prevent hazardous
machine or equipment conditions.
Parameters referred to
Online auto tuning
Offline auto tuning
Pr.190 to Pr.196 (Output terminal function selection)
308
5. PARAMETERS
5.8 (M) Monitor display and monitor output signal
0.1 s ∗
Time
OFF
ON ON
Pr.153 Pr.153
Detection time Detection time
page 371
page
353, page 363
page 297