Zero Current Detection (Pr. 152, Pr. 153) - Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual

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

Pr. 152 "zero current detection level"
Pr. 153 "zero current detection time"
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".
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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. 195 to assign the terminal used for Y13 signal output.)
Parameter
Factory Setting
Number
152 5.0%
153 0.5 s
Start signal
Pr. 152 "zero current
detection level"
Zero current detection
signal output
<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 drops 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 the online or offline auto tuning.
3. When the terminal functions are changed using Pr. 190 to Pr. 195, the other functions may be
affected. Confirm the functions of the corresponding terminals before making settings.
The zero current detection level setting should not be too high, and the zero current detection
time setting not be 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.
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Pr. 190 to Pr. 195
Setting Range
0 to 200.0%
0 to 1 s
OFF ON
Pr.152
100 ms (Note)
OFF ON OFF
Pr. 153 "detection time"
Pr. 153 "detection time"
Description
CAUTION
136
PARAMETERS
Related parameters
(output terminal function selection)
Output current 0 [A]
ON