Zero Current Detection (Pr. 152, Pr. 153) - Mitsubishi Electric FR-E 500 Instruction Manual

" " Zero current detection (Pr. 152, Pr. 153)

4.2.39 Zero current detection (Pr. 152, Pr. 153)
Pr. 152 "zero current detection level"
Pr. 153 "zero current detection period"
When the inverter's output current falls to "0", torque will not be generated. This may
cause a gravity drop when the inverter is used in vertical lift application.
To prevent this, the output current "zero" signal can be output from the inverter to close
the mechanical brake when the output current has fallen to "zero".
! 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 output terminal.
(Use any of Pr. 190 to Pr. 192 to assign the terminal used for Y13 signal output.)
Parameter Factory
Number Setting
152
153
Start signal
Pr. 152 "zero current
detection level"
Zero current
detection signal
output (Y13)
<Setting>
Refer to the following list and set the parameters:
Parameter
Number
Set the zero current detection level.
152 Set this parameter to define the percentage of the rated current at which the
zero current will be detected.
Set the zero current detection time.
153 Set a period of time from when the output current falls to or below the
Pr. 152 setting to when the zero current detection signal (Y13) is output.
Note: 1. If the current falls below the preset detection level but the timing condition is
not satisfied, the zero current detection signal is held on for about 100ms.
2. This function is also valid during execution of offline auto tuning.
3. When the terminal functions are changed using Pr. 190 to Pr. 192, the other
functions may be affected. Confirm the functions of the corresponding
terminals before making settings.
Setting
Range
5.0% 0 to 200.0%
0.5 s 0.05 to 1 s
OFF ON
Pr.152
OFF
Pr. 153 "detection time"
Related parameters
Pr. 190 to Pr. 192 (output
terminal function selection)
(Note)
Output current 0 [A]
100ms
OFF
ON
ON
Pr. 153 "detection time"
Description
143
PARAMETERS
4