Overload early warning/Current detection (level and timer)
Related function codes:
E37, E38 (Current detection 2/Low current detection level and timer)
E55, E56 (Current detection 3, level and timer)
These function codes define the detection level and time for the Motor overload early warning “OL”, Current
detected “ID”, Current detected 2 “ID2”, Current detected 3 “ID3”, and Low current detected “IDL” output signals.
Output
signal
E20,E21, E27
Assigned data
Detection level Timer
Motor
characteristics
Thermal time constant
Range:
See below
Range: 0.01 to 600.00 s
“OL” 7 E34 — F10 F12
“ID2” 37 E34 E35
— —
“ID2” 38 E37 E38
“ID3” 39 E55 E56
“IDL” 41 E37 E38
• Data setting range
Detection level: 0.00 (Disable), 1 to 200% of inverter rated current
Motor characteristics 1: Enable (For a general-purpose motor with shaft-driven cooling fan)
2: Enable (For an inverter-driven motor, non-ventilated motor, or motor with separately
powered cooling fan)
■ Motor overload early warning signal – “OL”
The OL signal is used to detect a symptom of an overload condition (alarm code
0l1
) of the motor so that the
user can take an appropriate action before the alarm actually happens. The OL signal turns ON when the inverter
output current exceeds the level specified by E34. In typical cases, set E34 data to 80 to 90% against F11 data
(Electronic thermal overload protection for motor 1, Overload detection level). Set the temperature characteristics
of the motor with electronic thermal (motor characteristics selection, thermal time constant).
■ Current detected, Current detected 2 and Current detected 3 – “ID”, “ID2” and “ID3”
When the inverter output current exceeds the level specified by E34, E37 or E55 for the period specified by E35,
E38 or E56, the ID, ID2 or ID3 signal turns ON, respectively. When the output current drops below 90% of the
specified detection level, the ID, ID2 or ID3 turns OFF. (The minimum ON-duration is 100 ms.)
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