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POWERING TECHNOLOGY
Manual No. MS0027-MAN rev. 4
guardian_access_3u_ms27-man-rev4-0817.indd
Figure 4-8 Grounding Connection with Extended Rear Cover - Single Point
4.5 AC Input Connection
WARNING Ensure that mains input is turned o before connecting. The grounding must
be connected to PE terminal as rst.
WARNING High leakage current. Ensure earth is connected before connecting mains
supply.
WARNING Only a qualied electrician may carry out the mains installation.
CAUTION Depending on deployment region with regards to lightning strikes and heavy
inductive energy, it is highly recommended to install AC Surge Protection Class C, if not
delivered with the system..
WARNING Used cable must be inserted into the terminal with as little insulation removed
as possible, so as to prevents any stranded conductor coming loose and touching any other
conductive parts. Tighten terminals securely with torque 1.5-1.8Nm.
1. Strip the AC input cable conductors to the correct length for connection to the terminals.
2. Route the AC input cable through the AC cable entry and connect the cable to the AC
terminals and tighten the screws to 1.5 - 1.8 Nm.
3. The mains input terminal blocks can be connected to:
• 1-phase 110VAC or 230VAC (Figure 4-9)
• 3-phase 110/190VAC or 230/400VAC (Figure 4-10).
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