Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual page 158

Pr. 167 = 0 or 1
Output
current
Pr.152
Pr.152
0[A]
OFF ON
Start signal
OFF
Zero current
detection time
Pr. 153
(Y13)
Detection time
* Once turned ON, the zero current detection time
signal (Y13) is held on for at least 0.1s.
CAUTION
⋅ The response time of Y12 and Y13 signals is approximately 0.1s. Note that the response time changes according to the load
condition.
⋅ 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.
The zero current detection level setting should not be too low, 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 ♦
Pr. 190 to Pr. 196 (output terminal function selection)
(2) Zero current detection (Y13 signal, Pr. 152, Pr.
⋅ 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
the inverter's open collector or relay output terminal.
0.1s
Time
*
⋅ 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,
OFF
ON ON
the output current zero signal (Y13) can be output from the
Pr. 153
inverter to close the mechanical brake when the output
Detection time
current has fallen to "0".
⋅ When Pr.167 = "10" or "11", turning Y13 signal ON stops the
inverter output and causes output current detection fault
(E.CDO) to be displayed. ON status of Y13 signal is held for
0.1s at the fault. Setting Pr. 167 = "10" or "11" while Y13
signal is ON does not cause E.CDO. Setting to Pr. 167
becomes effective after Y13 is turned OFF.
⋅ 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.
CAUTION
Refer to page 140
Function assignment of external
153, Pr. 167)
terminal and control
147
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