Peak Current Detection Function - Mitsubishi Electric MELSEC-Q series User Manual

4.7

Peak Current Detection Function

An abnormal current value from a CT can be detected. The peak current occurred excessively at a system start-up or
an overload of devices can be detected using the peak current detection function. Doing so improves maintainability of
devices and the failure diagnosis for a measured target.
(1) Notifying the peak current detection
When CH Digital output value (Un\G11 to Un\G18) exceeds set CH Peak current detection value (Un\G326 to
Un\G333) consecutively for the duration of set CH Peak current detection time (Un\G318 to Un\G325), an error
is notified as follows.
• Peak current detected (1) is stored in Peak current detection flag (Un\G301).
• Peak current detection signal (X7) turns on.
• The ALM LED flashes.
• Alarm code 120 is stored in Latest error code (Un\G19).
Alarm codes are stored as below.
However, digital conversion on the channel where an error is notified was held.
CH1 Peak current
detection flag
(Un\G301.b0)
Peak current detection
signal (X7)
Error clear request (YF)
44
120
Fixed
Peak current detection channel number
Digital output value
Peak current
detection time
Peak current
detection value
OFF
OFF
OFF
Controlled by the CT input module
Controlled by the sequence program
ON
OFF
ON
OFF
ON
OFF
Time