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Application Manual CDA3000
5 Software functions
Note: With KTY 84-Evaluation the current motor temperature is
displayed in parameter 407-MTEMP in ˚C (actual value/VAL
menu).
Ixt monitoring
Ixt monitoring protects the motor against overheating over its entire speed
range. This is especially important for internally cooled motors, since in
lengthy service at low speed the cooling provided by the fan and the hou-
sing is insufficient. When set correctly, this function replaces a motor cir-
cuit-breaker. The characteristic can be adapted to the operating conditi-
ons by way of interpolation points.
Motor protection characteristic in factory setting
Figure 5.20 Factory setting of the motor protection characteristic
Explanatory notes
The inverter module shuts off the motor with the error message E-OTM if
the temperature exceeds a limit value.
The following temperature sensors can be used:
• Linear PTC (KTY 84, yellow)
• Threshold PTC (to DIN 44082)
• Thermostatic circuit-breaker (Klixon)
I
N
= 335-MOPCN
f
N
= 336-MOPFN
I[A]
f
N
f
b
f [Hz]
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