PowerWalker VFI 20000-40000TAP 3/3 BI, User Manual

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4-5
4.4 External Power Wiring Installation
Without accessory cabinets, conduit and wiring enter from the bottom of the UPS
conduit landing plate. With accessory cabinets, wiring can be installed between the
UPS and accessory cabinets by using conduit or by routing wiring through the
power terminal cover base wiring channels.
NOTE
To install wiring:
1. Route the wiring to the UPS terminal blocks in the UPS. Figure 4-4 and Figure 4-5 for wiring access
information and terminal locations.
2. Ground the UPS according to local and/or national electrical wiring codes by routing and connecting the
ground wire to the input ground lug.
3. Connect phase A, B and C rectifier input power wiring from the utility source to the rectifier input, See
paragraph 3.2.2 for wiring and termination requirements.
4. Bypass input power wiring from the utility source to the bypass input terminals and neutral terminals. See
paragraph 3.2.2 for wiring and termination requirements.
5. Connect phase A, B and C power wiring from output terminals to the critical load. See paragraph 3.2.2 for
wiring and termination requirements.
6. Mains input N , Output N and Bypass input N are connected together inside UPS.
7. If wiring interface connections, proceed to paragraph 4.5.
WARNING
• HIGH TOUCH CURRENT. EARTH CONNECTION ESSENTIAL BEFORE CONNECTING
SUPPLY. As a result of the connected loads high leakage current is possible. Connection of the
earth (ground) is required for proper product operation. Do not check UPS operation by
removal of the Earth (ground) connection.
• BAT+/BAT- are terminals connected to the battery cabinet, polarity should use red
cable, battery - polarity should use black or blue cable.
• This device may not be fitted with an optional internal mains disconnection device. If not
fitted, it is essential that the customer install such a device at the installation site near the
UPS.
• Input neutral line should be directly connected to input “N” terminal of UPS wire connection
terminal bay without AC input idle-run.
• There are protective earthing terminals within the UPS for mains supply, load supply and
battery. The battery cabinet earth protection can be connected either to the UPS or to a
common earthing terminal outside the UPS.