Mitsubishi FR-A800

(M) Monitor display and monitor output signal
396
PARAMETERS
Zero current detection (Y13 signal, Pr.152, Pr.153)
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.
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Parameters referred to
Online auto tuning page 460
Offline auto tuning page 442, page 452
Pr.190 to Pr.196 (output terminal function selection) page 384
• If the 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 relay output
terminal.
• Once turned ON, the zero current detection time signal (Y13) is held
ON for at least 0.1s.
• If the inverter output current drops to "0", because torque is not
generated, slippage due to gravity may occur, especially in a lift
application.
To prevent this, the Y13 signal, which closes the mechanical brake at
"0" output current, can be output from the inverter.
• 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.
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.
OFF ON
Start signal
Time
Output
current
OFF
ON
Zero current
detection time
(Y13)
Pr.153
Detection time
Pr.153
Detection time
Pr.152
OFF
ON
0[A]
0.1s ∗
Pr.152
∗ When the output is restored to the Pr.152 level, the Y13
signal is turned OFF after 0.1 s.
Pr.167 = "0"