The current fan speed control depends only on the AUX-PS sensor and the built-in power modules when loaded. However the SMX with 24 relays in extreme cases can get seriously heated. The situation is somewhat better with PREL which has only 6 relays. For this reason, you will need to measure the temperature of the MCU (i.e. Temperature sensor channel) and control the fan speed with it. OTP is not required on new modules. Other possibility is to start fan if more then e.g. certain number of relays are turned on.
The current fan speed control depends only on the AUX-PS sensor and the built-in power modules when loaded. However the SMX with 24 relays in extreme cases can get seriously heated. The situation is somewhat better with PREL which has only 6 relays. For this reason, you will need to measure the temperature of the MCU (i.e. Temperature sensor channel) and control the fan speed with it. OTP is not required on new modules. Other possibility is to start fan if more then e.g. certain number of relays are turned on.