Mitsubishi Electric FR-F800 Series Instruction Manual page 341

Pr.166 "9999", Pr.167 = "0"
Pr.150
Output current
Output current
detection signal
(Y12)
 Zero current detection (Y13 signal, Pr.152, Pr.153)
• If the inverter output during inverter running remains higher than the Pr.152 setting for the time set in Pr.153 or longer, the
Zero current detection (Y13) signal is output from the inverter's open collector or the relay output terminal.
• Once the Zero current detection (Y13) signal turns ON, the signal is retained ON for at least 0.1 second.
• 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 parameter from 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 output 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 400
Offline auto tuningpage
Pr.190 to Pr.196 (Output terminal function
340
5. PARAMETERS
5.8 (M) Item and output signal for monitoring
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Pr.151
Time
Pr.166
OFF OFF
ON
Pr.152
0.1s ∗
Time
OFF OFF
ON ON
Pr.153 Pr.153
Detection time Detection time
383, page 392
selection)page 330
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