Vacon NX User Manual

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Vacon NX User Manual Manual pdf 40 page image

4vacon • 39 THERMISTOR FUNCTION (ATEX)Tel. +358 (0) 201 2121 • Fax +358 (0)201 212 2054.2 CommissioningNote: Installation, testing and service work on the OPT-AF board can be performed only by profes-sional persons.Note: It is not allowed to perform any repair work on the OPT-AF board.4.2.1 General wiring instructionsThe thermistor connection must be done using a separate control cable. It is not allowed to usewires belonging the motor supply cables or any other main circuit cables. It is recommended to usea shielded control cable.Note: It is recommended to test the ATEX functionality using thermistor input on OPT-AF board pe-riodically (typically once a year). For testing, the thermistor connection to the OPT-AF board is dis-connected. The drive ready signal goes low (green LED on the keypad goes OFF). Check for thecorresponding warning or fault indication in the drive according to the parameter setting explainedin Chapter 4.2.2.4.2.2 Parameter setting for ATEX functionIn case of overtemperature, the drive modulation is disabled. The drive will not anymore feed ener-gy to the motor thus preventing further overheating of the motor. See Figure 16.When drive is connected to the main power and if the motor temperature is below overtemperaturelimits (see Figure 18), the drive goes to ready state. The motor may start in presence of start com-mand from a selected control place.If the motor temperature is above the overtemperature limits (see Figure 18), fault /warning (F29)thermistor is activated depending on the programming in the application.The application programming for the thermistor fault is as follows e.g. in factory applications.* With OPT-AF board according to ATEX directive 94/9/EC (i.e jumper wire X12 not cut) , responseto thermistor fault = 2 is always same as response to thermistor fault =3, i.e. stop by coasting.When the resistance of the thermistor(s) mounted in the motor goes above 4 kΩ due to motor over-heating, the drive modulation is disabled within 20 ms. Fault F29 or warning A29 is generated in thedrive according to the above-mentioned programming.According to the curve, when the temperature falls below 2 kΩ (see Figure 18), the thermistor func-tion allows the drive to be enabled again.Maximum cable length withoutshort circuit monitoringX10: OFFMaximum cable length withshort circuit monitoringX10: ON>= 1.5 sq mm 1500 meters 250 metersCode Parameter Default ID NoteP2.7.21 Response toThermistor Fault2 732 0= No Response1= Warning2= Fault according to Stop Mode. *3= Fault, stop by coasting.