F07018 — Additional temperature fault threshold exceeded

F07018 is raised when the additional (supplementary) temperature has risen above the fault threshold stored in p4102[1]. The drive records a fault value in r0949, to be interpreted as a decimal number, which distinguishes the two conditions behind this message: a genuine overtemperature (0) or a fault in the temperature sensor circuit (1).

• Fault value 0: the supplementary temperature in r4105 stayed above the fault threshold (p4102[1] or p4102[0]) for longer than the delay time in p4103 — a genuine overtemperature.
• Fault value 1: a problem in the sensor circuit — wire breakage, a sensor that is not connected, or a measured resistance that is too low.

1. Read the fault value in r0949 (interpret decimal) to see whether the drive signalled overtemperature (0) or a sensor circuit problem (1).
2. Make sure that the temperature sensor is connected correctly.
3. Check the sensor type parameterization in p4100.
4. If the fault value is 0, compare the actual supplementary temperature in r4105 with the thresholds in p4102[0] and p4102[1], and check the delay time in p4103.

The drive writes the fault value into r0949; interpret it as a decimal number:

• 0 — Overtemperature (r4105 > p4102[1] or r4105 > p4102[0] for longer than the time in p4103).
• 1 — Wire breakage or sensor not connected (KTY: R > 1630 Ohm, PT1000: R > 1720 Ohm). Measured resistance too low (KTY: R < 50 Ohm, PT1000: R < 603 Ohm).

• p4100 — sensor type of the supplementary temperature measurement; the remedy for this code is to check that it matches the sensor actually connected.
• p4102 — supplementary temperature fault/alarm threshold; the fault threshold named by this code is p4102[1], and the overtemperature condition also compares r4105 against p4102[0].
• p4103 — supplementary temperature delay time; the temperature must exceed the threshold longer than this before the fault is raised.
• r4105 — CO actual value of the supplementary temperature; compare it with the thresholds in p4102 to confirm whether a genuine overtemperature exists.
• r0949 — fault value; read it as a decimal number to tell overtemperature (0) apart from a sensor circuit fault (1).

The fault is acknowledged immediately. Once the sensor is connected correctly and the sensor type in p4100 has been verified, acknowledge the fault and restart the drive.