A02040 — Function generator: Illegal value for offset

The drive raises alarm A02040 when the offset of a function generator no longer fits the window configured for it: the value in p4826 (function generator offset) is set higher than the upper limit in p4829 or lower than the lower limit in p4828. The manuals for the G130, G150, S120 and S150 describe the condition identically, so the same explanation and the same fix apply to each of these converters. This is a parameterization alarm: the drive takes no automatic reaction to it, and it is not cleared with a fault acknowledgment but by correcting the offset and restarting the function generator.

• The value set for the function generator offset in p4826 is higher than the value of the function generator upper limit in p4829.
• Or the offset value in p4826 is lower than the value of the function generator lower limit in p4828.

1. Compare the offset set in p4826 with the lower limit in p4828 and the upper limit in p4829 to see which limit the offset violates.
2. Adjust the offset value in p4826 accordingly, so that it lies between the lower limit (p4828) and the upper limit (p4829).

• p4826 — function generator offset (FG offset): the value that must be corrected for this alarm so that it lies inside the limits configured for the function generator.
• p4828 — function generator lower limit (FG lower limit): the offset in p4826 must not be set below this value.
• p4829 — function generator upper limit (FG upper limit): the offset in p4826 must not be set above this value.

The manual gives the reset in two steps: remove the cause of this alarm. restart the function generator. Removing the cause means bringing the offset in p4826 back between the lower limit (p4828) and the upper limit (p4829); the function generator is then restarted. No fault acknowledgment is required for this alarm — it goes away on its own once the function generator runs again with a valid offset. The manual points to p4826, p4828 and p4829 for this procedure.