Mitsubishi Electric FR-D720-070 Instruction Manual page 130

Function assignment of external terminal and control
Pr. 152
Pr. 152
0[A]
0.1s*
OFF ON
Start signal
Zero current
OFF OFF
ON
detection time
(Y13)
Pr. 153
Detection time
* The zero current detection signal (Y13) holds the
signal for approximately 0.1s once turned on.
REMARKS
This function is also valid during execution of the offline auto tuning.
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.
NOTE
Changing the terminal assignment using Pr. 190, Pr. 192 (output terminal function selection) may affect the other functions.
Make setting after confirming the function of each terminal.
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 detection signal, install a
safety backup such as an emergency brake even the zero current detection function is set valid.
Parameters referred to
Offline auto tuning Refer to page 105
Pr. 190, Pr. 192 (output terminal function selection)
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
(2) Zero current detection (Y13 signal, 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 collector or relay output terminal.
When the inverter's output current falls to "0", torque will not
be generated. This may cause a drop due to gravity when
Time
the inverter is used in vertical lift application.
To prevent this, the Y13 signal can be output from the
inverter to close the mechanical brake when the output
ON
current has fallen to "zero".
For the Y13 signal, set "13 (positive logic) or 113 (negative
Pr. 153
Detection time
logic)" in Pr. 190 or Pr. 192 (output terminal function selection)
and assign functions to the output terminal.
CAUTION
Refer to page 119
4
125