Vacon NX User Manual
Also see for NX: Installation manualUser manualQuick helpUser manualUser manual
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4vacon • 37 THERMISTOR FUNCTION (ATEX)Tel. +358 (0) 201 2121 • Fax +358 (0)201 212 2054.1.2 Hardware and connectionsThe thermistor (PTC) is connected between the terminals 28(TI1+) and 29(TI1-) of the OPT-AF board.The optocoupler isolates the thermistor inputs from the control board potential.* If 230 VAC is used as control voltage from the output relays, the control circuitry must be powered with a se-parate isolation transformer to limit short circuit current and overvoltage spikes. This is to prevent the weldingon the relay contacts. Refer to standard EN 60204-1, section 7.2.9.The overtemperature is detected by hardware on OPT-AF board. See temperature versus resis-tance curve as in the figure below.Table 6. OPT-AF I/O terminalsTerminalParameter referenceon keypad andNCDriveTechnical information1 SD1+ DigIN:B.2 Isolated STO input 1 +24 V +-20% 10... 15 mA2 SD1- Virtual GND 13 SD2+ DigIN:B.3 Isolated STO input 2 +24 V +-20% 10... 15 mA4 SD2- Virtual GND 2212223RO1/normal closedRO1/commonRO1/normal open DigOUT:B.1Relay output 1 (NO/NC) *Switching capacity 24 VDC/8 A250 VAC/8 A125 VDC/0.4 AMin. switching load 5 V/10 mA2526RO2/commonRO2/normal openDigOUT:B.2Relay output 2 (NO) *Switching capacity 24 VDC/8 A250 VAC/8 A125 VDC/0.4 AMin. switching load 5 V/10 mA2829TI1+TI1- DigIN:B.1Thermistor input; Rtrip > 4.0 kΩ (PTC)max voltage = 10 Vmax current = 6,7 mA |
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