Overtemperature unit (OHI)
The inverter is not a temperature measuring device!
➢ The detection of the temperature only serves to protect the inverter
and is, depending on the device type and the current measuring
point, subject to varying degrees of tolerance and error.
internal temperature PU
values
Internal temperature in the power unit (PowerUnit)
at different points (depending on the inverter size)
internal temperature PU 1
Internal temperature in the power unit measuring
point 1
internal temperature PU 2
Internal temperature in the power unit measuring
point 2
internal temperature PU 3
Internal temperature in the power unit measuring
point 3
Display of the smallest difference between an inter-
nal temperature and the associated error trigger
value
Internal temperature on the control board (Con-
trolBoard)
temperature warning set-
ting mode
Selection of the reference level for generating the
overtemperature warning
Internal temperature (of the power unit or control
board) when OHI warning is triggered
Error reaction (=> see Chapter 4.3.1 Errors)
Error reaction to pre-warning (=> also chapter 4.3.1
Errors)
Display of the warnings bit-coded (=> 4.3.3 Warn-
ings)
Mask for warning bit in the status word (=> 4.3.3
Warnings)
The internal temperature is measured at several points, with one sensor on the
control board and one or more sensors in the power unit.
On reaching an unit-dependent maximum internal temperature, the drive behaves
according to the setting of pn10 E.OHI stop mode.
The length of time required to shutdown the drive depends on many factors. The
maximum time between occurence overtemperature and switch-off modulation is 2
seconds.
If the time exceeds 2 seconds and the overtemperature error is still present, it will
be switched off with error message 111: ERROR time OHI.
If these 2 seconds are too small to ensure a meaningful completion of the machine
cycle, a warning level pn09 OHI warning level can be programmed. Upon reaching
this temperature, bit 3 is set in ru02 warning bits and with respective setting of the
warning mask also bit 7 in the status word.