Mitsubishi Electronics FR-S500 instruction manual Zero current detection Pr. 50 , Pr, Setting

Current detection function parameters

2.5.2Zero current detection (Pr. 50 , Pr. 51 )

When the inverter's output current falls

Start signal OFF ON Pr.50

to "0[A]", torque will not be generated. This may cause a gravity drop when the inverter is used in vertical lift application.

Output current 0 [A] Zero current detection signal output (Y13)

				"zero
Pr.50				current
		100ms		detection
OFF	ON	OFF	ON	level"
	Pr.51	Pr.51
	detection period detection period

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 "0[A]".

Parameter	Name	Factory	Setting	Remarks
		Setting	Range
50	Zero current detection level	5%	0 to 200%	Setting is enabled when
				Pr. 30 = "1"
51	Zero current detection period	0.5s	0.05 to 1s

POINT

If the output is lower than the Pr. 50 setting for longer than the time set in Pr. 51 during inverter operation, the zero current detection (Y13) signal is output from the inverter's open collector output terminal or contact output terminal.

<Setting>

Parameter Description

Set the zero current detection level.

50Set the level of zero current detection in terms of the percentage of the rated inverter current from the output current value of 0 [A].

Set the zero current detection period.

51Set a period of time from when the output current falls to or below the Pr. 50 setting to when the zero current detection signal (Y13) is output.

Use Pr. 64 or Pr. 65 (output terminal function selection) to assign the terminal used for Y13 signal output.

CAUTION

•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.

•When the terminal functions are changed using Pr. 64, Pr. 65, the other functions may be affected. Please make setting after confirming the function of each terminal.

•When running (connecting) multiple motors with one inverter in due order, the zero current detection signal (Y13) may be output. Set 13% or more for the 0.1K and 8% or more for the 0.2K.

(when the total capacity of motors is less than the zero current detection level and the motor capacity per inverter is less than the zero current detection level)

♦Related parameters♦

•Assignment of Y13 signal to terminal ⇒ Pr. 64 "RUN terminal function selection", Pr. 65 "A, B, C terminal function selection" (refer to page 100)

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FUNCTIONS

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