Mitsumi electronic 55K Zero current detection Pr , Pr, Zero current detection level

			PARAMETERS
4.2.42 Zero current detection (Pr. 152, Pr. 153)
Pr. 152	"zero current detection level"		Related parameters
		Pr. 190 to Pr. 195
Pr. 153	"zero current detection period"	(output terminal function selection)

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. 195 to assign the terminal used for Y13 signal output.)

Parameter	Factory Setting	Setting Range
Number
152	5.0%	0 to 200.0%
153	0.5 s	0 to 1 s

Start signal

OFF ON

Pr. 152 "zero current				Output current 0 [A]
detection level"	Pr.152
			100 ms (Note)
Zero current detection
	OFF	ON	OFF	ON
signal output (Y13)
	Pr. 153 "detection time"		Pr. 153 "detection time"

<Setting>

Refer to the following list and set the parameters:

Parameter	Description
Number

152Set the zero current detection level.

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.

153Set 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.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.

CAUTION

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.

Pr. 154 % Refer to Pr. 22.

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