Mitsubishi Electric FR-E540 Instruction Manual download pdf (Page 146)

PARAMETERS

133

Pr. 190 to Pr. 195

(output terminal function selection)

arameters

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 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

Number

Factory Setting Setting Range

152 5.0% 0 to 200.0%

153 0.5 s 0 to 1 s

Output current 0 [A]

OFF ON

Pr.152

OFF ON

100 ms (Note)

Start signal

Pr. 152 "zero current

detection level"

Zero current detection

signal output (Y13)

Pr. 153 "detection time"

Refer to the following list and set the parameters:

Parameter

Number

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 time.

Set 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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Mitsubishi Electric FR-E540 Instruction Manual Page 146

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