Lust CDA3000 - Device Protection

Application Manual CDA3000
5-63
5 Software functions
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5.3.3 Device
protection
The software and hardware of the CDA3000 inverter module autono-
mously monitors and protects the frequency inverter.
The power stage protects itself against overheating dependent on
• the heat sink temperature
• the current DC-link voltage
• the power stage transistor module used and
• the modulation switching frequency
Note: The current heat sink temperature of the inverter module in
the range of the power transistors (KTEMP) and the device
interior temperature (DTEMP) are displayed in ˚C (actual
value/VAL menu).
Under high load the I
2
xt integrator is activated. The I
2
xt monitor protects
the device against permanent overload. The shutdown limit is calculated
from the rated current of the device, which can be outputted for
60 seconds.
Function Effect
• Protection of the CDA3000
inverter module against
destruction by overload
The inverter module shuts off the
motor with an error message:
• E-OTI, if the device tempera-
ture exceeds a fixed limit
value.
• E-OLI if the up-integrated
current/time value exceeds
the preset limit value
dependent on the inverter
module for a specific release
time.
• E-OC in case of short-circuit
or ground fault detection
• The inverter module can
deliver a warning message
when the I
2
xt device protec-
tion integrator starts.