Mitsubishi Electronics FR-S500 Stall prevention function and current limit function Pr

Explanation of functions (parameters)

2.3.12 Stall prevention function and current limit function (Pr. 21 )

You can make setting to prevent stall caused by overcurrent and/or to prevent the inverter from resulting in an overcurrent trip (to disable high-response current restriction that limits the current) when an excessive current flows due to sudden load fluctuation or ON-OFF on the output side of a running inverter.

•Stall prevention

If the current exceeds the stall prevention operation level (Pr.22), the output frequency of the inverter is automatically varied to reduce the current.

•High response current limit

If the current exceeds the limit value, the output of the inverter is shut off to prevent an overcurrent.

Parameter	Name	Factory	Setting	Remarks
		Setting	Range
21	Stall prevention	0	0 to 31, 100	Setting is enabled when Pr. 30 =
	function selection			"1".

		Stall
		Prevention	OL Signal
	High	Operation	Output
	Response	Selection	:
	Current	:	Operation
Pr. 21	Limit	Activated	continued
		: Not
Setting	:		:
		activated
	Activated		Operation
		Acceleration Constant speed Deceleration
	: Not		not
	activated		continued
			(*)

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

*When "Operation not continued for OL signal output" is selected, the "OLT" alarm code (stopped by stall prevention) is displayed and operation stopped.

(Alarm stop display " ")

			Stall		OL Sig-
			Prevention		nal Out-
		High	Operation		put
		Response	Selection		:
		Current	:		Opera-
Pr. 21		Limit	Activated		tion con-
			:Not
Setting		:			tinued
			activated
		Activated			:
		:Not	Acceleration Constant speed	Deceleration	Opera-
		activated			tion not
					contin-
	16				ued(*)
	17
	18
	19
	20
	21
	22
	23
	24
	25
	26
	27
	28
	29
	30
	31
100	Driving
	Regene rative

2

FUNCTIONS

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