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Current detection (Pr. 150 to Pr. 153)
PARAMETERS
3
3.16.2 Zero current detection (Pr. 152, Pr. 153 )
<Setting>
Refer to the following table and set the parameters.
When the inverter's output current falls to "0", torque will not be generated. This may cause a gravity drop to
occur 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".
z If the output current remains lower than the Pr. 152 setting during inverter operation for longer than the
period 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 and Pr. 195 to assign the terminal used for Y13 signal output.)
Parameter Name Factory Setting Setting Range
152 Zero current detection level 5.0% 0 to 200.0%
153 Zero current detection period 0.5s 0 to 1s
Parameter Description
152
Set the zero current detection level.
Set this parameter to define the percentage of the rated current at which the zero current will be detected.
153
Set the zero current detection period.
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.
CAUTION
1. If the current rises above the preset detection level and the 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 auto tuning.
3. Changing the terminal function using any of Pr. 190 to 192 and Pr. 195 may affect the other functions.
Confirm the functions of the corresponding terminals before making setting.
4. When "0 to 0.04" is set in Pr. 153, the zero current detection period is about 50ms.
CAUTION
The zero current detection level setting should not be too high, and the zero current detection period
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.
Related parameters
• Y13 signal terminal assignment ⇒ Pr. 190 to Pr. 192, Pr. 195 (output terminal function selection) (Refer to page 152.)
speed torque position
OFF ON
Start signal
Pr. 152 "zero current
detection level"
OFF ON
Zero current
detection
signal output (Y13)
Pr. 153 "detection period" Pr. 153 "detection period"
Pr.152
OFF ON
Output current 0[A]
100ms
(Caution1)