Lenze i550

13.6 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 device 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 voltages cause a
greater device ulisaon.
•
If the device ulisaon exceeds the warning threshold set in 0x2D40:002 (default seng:
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 any further operaon is stopped.
•
Device overload monitoring depends on the inverter load characterisc 0x2D43:001
(P306.01).
•
The device overload can be obtained from the conguraon document.
Parameter
Address Name / seng range / [default seng] Info
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.
•
With the seng 0 % or ≥ 100 %, the warning is deacvated.
0x2D40:004
(P135.04)
Device ulisaon ixt: Device actual ulisaon
(Device ulisat.: ixt ulisaon)
•
Read only: x %
Display of the current device ulisaon.
0x2D40:005
(P135.05)
Device ulisaon ixt: Device ulisaon (i*t): Error
response
(Device ulisat.: Error response)
Selecon of the response to be executed when the device overload
monitoring funcon is triggered.
Associated error code:
•
9090 | 0x2382 - I*t error
2 Trouble
4Error types^ 611
3 Fault
13.7 Heatsink temperature monitoring
Parameter
Address Name / seng range / [default seng] Info
0x2D84:001
(P117.01)
Heatsink temperature: Heatsink temperature
(Heatsink temp.: Heatsink temp.)
•
Read only: x.x °C
Display of the current heatsink temperature.
0x2D84:002 Heatsink temperature: Heatsink temperature: Warn-
ing threshold
50.0 ... [80.0]* ... 100.0 °C
* Default seng depending on the size.
Warning threshold for temperature monitoring.
•
If the heatsink temperature exceeds the threshold set here, the inver-
ter outputs a warning.
•
The warning is reset with a hysteresis of approx. 5 °C.
•
If the heatsink temperature increases further and exceeds the non-
adjustable error threshold (100 °C), the inverter changes to the
"Fault" device status. The inverter is disabled and thus any further
operaon is stopped.
Device funcons
Heatsink temperature monitoring
511