scope:

Description of Driving Event:

During a materials science investigation process run within the MSG on-board ISS on 7/23/02, the SUBSA Eurotherm Controller (Zone 1) on the Process Control Module (PCM) would not take a command to raise the Thermal chamber main heater setpoint above 825 degrees C.

Files were uplinked to query setpoint limits in the Eurotherm Controller; a local Mod Bus setpoint limit of 825C was found and confirmed why the anomaly occurred.

SUBSA's Investigation Control Software (ICS) was reconfigured to route Zone 1 setpoint temperature commands to Mod Bus 160 instead of Mod Bus 24 in the Eurotherm Controller. The Mod Bus 160 command address does not have a local setpoint limit. The desired setpoint of 845 degrees C was properly configured.

After these steps, no further problems were encountered prior to the completion of all on-board experiment processing.