Siemens SINUMERIK 828D Series Software And Hardware Service Manual page 172

Service cases - hardware
4.11 Motor Module Booksize Compact format
3. Carefully withdraw the fan.
4. Release the connector before you withdraw it.
Installing the fan
Procedure:
1. Before installing the fan, observe the direction of the airflow: The arrow on the fan must
point toward the cooling ribs.
2. Insert the cable connector until it latches into place.
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Software and hardware
Service Manual, 08/2018, 6FC5397-5DP40-6BA1