34 Operation principle and hardware description
Supply module (frame D7T)
Description
A DSU module, frame size D7T, front
B DSU module, frame size D7T, back
1. DC output busbars
2. Cover panel of the module’s DC fuses
3. Terminal block [X53]. 24 V DC power for supply module control unit.
4. Fan
5. AC input busbars
6. Unpainted fastening hole. The grounding point (PE) between module frame and cabinet frame.
7. Terminal block [X50] (power supply for internal boards; DOL fan supply, option +C188)
8. Fiber optic connectors. Communication link to the supply module control unit. When speed-controlled
fan is in use: Communication link to fan control unit.
9. Lifting eyes
10. Type designation label