Mitsubishi Electric FR-E700 Instruction Manual page 288

Function assignment of external terminals
Zero current detection (Y13, Pr. 152, Pr. 153)
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 col-
lector or relay output terminal. As soon as the signal is output to terminal Y13, it remains turned on for
100 ms.
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, the output current zero
signal (Y13) can be output from the inverter to close the mechanical brake when the output current
has fallen to "zero".
Set "13" (source logic) or "113" (sink logic) to any of Pr. 190 to Pr. 192 "Output terminal function se-
lection" to assign the function of the output power detection signal (Y13) to the output terminal.
Fig. 6-64: Zero current detection
NOTES This function is also valid during execution of the online auto tuning.
The response time of Y12 and Y13 signals is approximately 0.1 s. 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. 192 "Output terminal function selection"
may affect the other functions. Make setting after confirming the function of each terminal.
CAUTION:
E
The zero current detection level setting should not be too high, 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.
6 - 134
Output current
Pr. 152
Start signal
Zero current detection
signal Y13
Pr. 152
100 ms
ON
ON
Pr. 153
Parameter
Time
ON
Pr. 153
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