Thermistor function (ATEX) vacon • 37
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8
8.2 Commissioning
NOTE! Installation, testing and service work on the OPTBJ board can be performed only by quali-
fied persons.
NOTE! It is not allowed to perform any repair work on the OPTBJ board. Return faulty boards to
Vacon for analysis.
NOTE! It is recommended to test the ATEX functionality using thermistor input on OPTBJ board pe-
riodically (typically once a year). For testing, activate the thermistor functionality (e.g. remove Atex-
thermistor plug from the OPTBJ board). The drive enters to fault state and indicates fault 29 (Atex-
thermistor fault, subcode 280).
8.2.1 General wiring instructions
The thermistor connection must be done using a separate control cable. It is not allowed to use
wires belonging the motor supply cables or any other main circuit cables. A shielded control cable
must be used. See also Chapter
3.
8.2.2 Fault diagnosis of thermistor function
The table below shows the normal fault / warning, generated when thermistor input is active
See the fault table in chapter 6.1.
Maximum cable length without
short circuit monitoring
X23 : OFF
Maximum cable length without short
circuit monitoring
X23 : ON
>= 1.5 sq mm 1500 meters 250 meters
Fault code Fault ID Explanation Correcting measures
29 Atex-thermistor 280
Atex-thermistor has detected
overtemperature.
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