17.14 Device overload monitoring (i*t)
The inverter calculates the i*t
ulisaon in order to protect itself against thermal overload. In
simple terms: a higher current or an overcurrent that connues for a longer me causes a
higher i*t ulisaon.
DANGER!
Uncontrolled motor movements by pulse inhibit.
When the de
vice overload monitoring funcon is acvated, 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 condions.
Details
The device overload monitoring funcon primarily oers
protecon to the power secon.
Indirectly, also other components such as lter chokes, circuit-board conductors, and termi-
nals are protected against overheang. Short-me overload currents followed by recovery
periods (mes of smaller current ulisaon) are permissible. The monitoring funcon during
operaon checks whether these condions are met, taking into consideraon that higher
switching frequencies and lower stator frequencies as well as higher DC currents cause a
greater device ulisaon.
•
If the t
otal ulisaon exceeds the total warning threshold set in 0x2D40:008 (de
fault set-
ting: 95 %), the inverter outputs a warning.
•
If the device ulisaon 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 conguraon document.
Parameter
Address Name / seng range / [default seng] Info
0x2D40:001 Device ulisaon ixt: Power unit actual ulisaon
•
R
ead only: x %
Display of the power module ulisaon.
0x2D40:002 Device ulisaon ixt: Power unit warning threshold
0 ... [95] ... 101 %
If the device
ulisaon exceeds the threshold set, the inverter outputs a
warning.
0x2D40:003 Device ulisaon ixt: Power unit error threshold
•
Read only: x %
If the power module ulisaon exceeds the displayed threshold, the
inverter outputs a warning.
0x2D40:004 Device ulisaon ixt: Device actual ulisaon
•
R
ead only: x %
Display of the current device ulisaon.
0x2D40:005 Device ulisaon ixt: Device warning threshold
0 ... [95] ... 101 %
0x2D40:006 Device ulisaon ixt: Device error threshold
•
R
ead only: x %
If the device ulisaon exceeds the displayed threshold, the device out-
puts an error.
0x2D40:007 Device ulisaon ixt: Actual total ulisaon
•
R
ead only: x %
Display of the current total device ulisaon.
0x2D40:008 Device ulisaon ixt: Total ulisaon warning thresh-
old
0 ... [95] ... 101 %
If the total ulisaon exceeds the set threshold, the device outputs a
w
arning.
0x2D40:009 Device ulisaon ixt: Total ulisaon error threshold
•
Read only: x %
If the total ulisaon exceeds the displayed threshold, the device out-
puts an error.
Device funcons
Device overload monitoring (i*t)
359
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