Which products are affected?
starttec motor starter, software version 2.0
What happens?
If a starttec motor starter is disconnected by a contactor on the mains side another inhibited starttec (24 V control voltage available) connected to the mains via a contactor may indicate an Er255/OC9 error message.
When does the problem occur?
If each of the 2 starttec motor starters is connected to the same mains via a contactor and if one of the starttecs is disconnected by means of the contactor, a voltage/current peak may occur on the mains side. If the second starttec motor starter is connected to this mains (contactor closed) and the starttec is inhibited, the voltage/current peak may lead to an Er255 error message or OC9 TRIP in this motor starter when the contactor is disconnected.
Possible diagnostics?
Check whether the mains cable of the motor starter affected is connected in correct phase relation and read out the error history buffer (codes C0161 … C0164) regarding Er255 error message or OC9 TRIP while the motor starter is inhibited after disconnection of a contactor in the voltage supply of another motor starter connected to the same mains.
Short-term measures/recommendations?
In case of an enabled motor starter the error message mentioned before does not occur when another starttec motor starter is disconnected.
Evaluation:
The starttec motor starter is interfered at the mains input by a contactor of another motor starter when the motor starter is inhibited. It cannot be excluded that the device is damaged since the starttec is internally automatically disconnected whenever the voltage/current peak appears.
The function restriction is eliminated as of software version 2.1 of the starttec motor starter.
