text: <s>[INST] Kinetix 6000 Error E90 on 2094 IAM module. I'm currently having an issue with Kinetix 6000 Servo displaying an Error E90. Can anyone help elaborate on what causes this error and why the Precharge resistor would be overheated. System has run like this for years with no issues so i do not believe there is a sizing issue. [/INST] Hi Joshua, You are Welcome. Fault E90 is Precharge Timeout Fault, it occur when precharge resistor power exceeds the resistor rating. It is advised to wait for resistor to cool. Fault E90 is based on an algorithm to prevent the IAM's pre-charge resistor from overheating. Parameter 181 (viewable with Drive Explorer) is a warning bit that is set prior to the fault and Parameter 618 indicates the amount of time remaining before the warning bit will clear. If power is cycled while 181 is set, then the E90 fault will occur. See the release notes 2094-RN005A-EN-P_Jun05 for more information. E90 will flash on the seven segment Kinetix 6000 display and the IAM's contactor enable relay (-CONT EN, +CONT EN) will open to remove 3-phase power if it has been wired in per the installation instructions. Recovery from the E90 fault is accomplished using a MASR or MAFR, after 30-60 seconds to allow the resistor to cool and the IAM's contactor enable relay (-CONT EN, +CONT EN) will close. If the reset is attempted too soon the E90 fault will immediately reappear. Hope this helps. \\n </s>