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4.2.42 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 drop due to
gravity 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. 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 (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 period.
153
Set this parameter to define the period from when the output current drops below the Pr. 152 value until 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. Changing the terminal function using any of Pr. 190 to Pr. 195 may affect the other functions.
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 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.
% % % % Refer to Pr. 22.
Pr. 154
Setting Range
0 to 200.0%
0 to 1 s
OFF ON
Pr.152
100 ms (Note)
OFF
ON
Pr. 153 "zero detection time"
Description
CAUTION
135
PARAMETERS
Related parameters
Pr. 190 to Pr. 195
(output terminal function selection)
Output current 0 [A]
OFF
ON
Pr. 153 "current detection time"
4
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