Lenze i950

17.14 Device overload monitoring (i*t)
The inverter calculates the i*t
ulisaon in order to protect itself against thermal overload. In
simple terms: a higher current or an overcurrent that connues for a longer me causes a
higher i*t ulisaon.
DANGER!
Uncontrolled motor movements by pulse inhibit.
When the de
vice overload monitoring funcon is acvated, pulse inhibit is set and the motor
becomes torqueless. A load that is connected to motors without a holding brake may there-
fore cause uncontrolled movements! Without a load, the motor will coast.
▶
Only operate the inverter under permissible load condions.
Details
The device overload monitoring funcon primarily oers
protecon to the power secon.
Indirectly, also other components such as lter chokes, circuit-board conductors, and termi-
nals are protected against overheang. Short-me overload currents followed by recovery
periods (mes of smaller current ulisaon) are permissible. The monitoring funcon during
operaon checks whether these condions are met, taking into consideraon that higher
switching frequencies and lower stator frequencies as well as higher DC currents cause a
greater device ulisaon.
•
If the t
otal ulisaon exceeds the total warning threshold set in 0x2D40:008 (de
fault set-
ting: 95 %), the inverter outputs a warning.
•
If the device ulisaon exceeds the permanent error threshold 100 %, the inverter is disa-
bled immediately and generates an error message.
•
The device overload can be obtained from the conguraon document.
Parameter
Address Name / seng range / [default seng] Info
0x2D40:001 Device ulisaon ixt: Power unit actual ulisaon
•
R
ead only: x %
Display of the power module ulisaon.
0x2D40:002 Device ulisaon ixt: Power unit warning threshold
0 ... [95] ... 101 %
If the device
ulisaon exceeds the threshold set, the inverter outputs a
warning.
0x2D40:003 Device ulisaon ixt: Power unit error threshold
•
Read only: x %
If the power module ulisaon exceeds the displayed threshold, the
inverter outputs a warning.
0x2D40:004 Device ulisaon ixt: Device actual ulisaon
•
R
ead only: x %
Display of the current device ulisaon.
0x2D40:005 Device ulisaon ixt: Device warning threshold
0 ... [95] ... 101 %
0x2D40:006 Device ulisaon ixt: Device error threshold
•
R
ead only: x %
If the device ulisaon exceeds the displayed threshold, the device out-
puts an error.
0x2D40:007 Device ulisaon ixt: Actual total ulisaon
•
R
ead only: x %
Display of the current total device ulisaon.
0x2D40:008 Device ulisaon ixt: Total ulisaon warning thresh-
old
0 ... [95] ... 101 %
If the total ulisaon exceeds the set threshold, the device outputs a
w
arning.
0x2D40:009 Device ulisaon ixt: Total ulisaon error threshold
•
Read only: x %
If the total ulisaon exceeds the displayed threshold, the device out-
puts an error.
Device funcons
Device overload monitoring (i*t)
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