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P O W E R I N G T E C H N O L O G Y
Document Number: MS0031-MAN rev. 7
guardian_access_ms31-man-rev7-0521.indd
4.6 Removing the Covers (Optional)
The transparent plastic top cover and the front door of the Distribution Unit should be
removed for connecting AC cables, alarm cables and DC cables.
1. Push the top cover backwards to remove it (Figure 4-2, #1)
2. Unscrew the retaining screws on the left side of the front door and open the front door
(Figure 4-2, #2).
3. To remove the front door completely, lift it upwards once opened.
1
2
FRONT DOOR
RETAINING SCREWS
TOP COVER
Figure 4-2 Removing the Top Cover
4.7 Connecting Grounding Cable
An earth grounding connection is essential before connecting the AC supply.
The positive DC busbar is connected to the grounding point in the rear of the subrack using a
copper bar. The grounding pole of the power rack is located in the rear right corner.
1.
Switch off all breakers on the distribution panel.
2. Connect an insulated cable with a cross-section area of 16mm² (5AWG) between the
earth connection point of the subrack and the Main Earth Terminal (MET).
3. Tighten the cable connection to a torque of 8Nm.
