3.3 Optional cabinet units 71
3.3.1 Input reactor unit (IRU) 71
3.3.2 Input filter unit (IFU) 72
3.3.3 Voltage limiter unit (VLU) 73
3.3.4 Braking units 74
3.3.4.1 Braking chopper unit 75
3.3.4.2 Resistor braking unit 76
3.3.5 Excitation unit (EXU) 77
3.3.5.1 DCS800 control panel 78
3.3.5.2 Reversing switch 78
3.3.5.3 Output disconnector 78
3.3.6 Customer interface unit (CIU) 79
3.3.6.1 Arc detection with Arc Guard (optional) 80
3.4 Air cooling 80
3.4.1 Air-to-air heat exchangers 80
3.4.2 Auxiliary fan units 81
3.5 Cabinet design 82
3.6 Door locking system 83
3.7 Arc resistant design 83
3.7.1 Internal arc classification 83
3.8 Busbars and grounding 84
3.8.1 AC busbars 84
3.8.2 DC busbars 85
3.8.3 PE busbar 85
3.8.4 PG busbar 85
4. Transportation, storage and disposal 87
4.1 Safety 87
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