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Zero Current Detection (pr. 152, Pr. 153) - Mitsubishi Electric FR-V560 Instruction Manual

Vector inverter.
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Current detection (Pr. 150 to Pr. 153)
4.16.2 Zero current detection (Pr. 152, Pr. 153
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".
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
152
Zero current detection level
153
Zero current detection period
Start signal
Pr. 152 "zero current
detection level"
Zero current
detection
signal output (Y13)
<Setting>
Refer to the following table and set the parameters.
Parameter
Set the zero current detection level.
152
Set this parameter to define the percentage of the rated current at which the zero current will be detected.
Set the zero current detection period.
153
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.
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 165.)
Name
Factory Setting
OFF ON
Pr.152
OFF
Pr. 153 "detection period"
CAUTION
with
without
Encoder
Encoder
Speed
Setting Range
5.0%
0 to 200.0%
0.5s
0 to 1s
Output current 0[A]
100ms
(Caution1)
ON
OFF
ON
Pr. 153 "detection period"
Description
160
with
without
Condi-
tional PLC
SSC
Encoder
Encoder
Torque
Position
)

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