Mitsubishi Electric FR-F740 EC Instruction Manual page 282

Function assignment of external terminals
Zero current detection (Y13, Pr. 152, Pr. 153, Pr. 167)
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. As soon as the signal is output to terminal Y13, it remains
turned on for 100ms.
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".
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.
Set "13" (source logic) or "113" (sink logic) to any of Pr. 190 to Pr. 196 "Output terminal function
selection" to assign the function of the output power detection signal (Y13) to the output terminal.
Fig. 6-71:
NOTE 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.
When terminal assignment is changed using Pr. 190 to Pr. 196 "Output terminal function
selection", the other functions may be affected. Please make setting after confirming the
function of each terminal.
CAUTION:
E
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.
6 - 132
Output current
Pr. 152
Start signal
Zero current detection
signal Y13
Zero current detection
Pr. 152
100ms
ON
ON
Pr. 153
Parameter
Time
ON
Pr. 153
I001156E