User Manual
11
Wiring the UPS
Before connecting the UPS, read the siting considerations above and check you have selected breakers
and cables with the correct ratings.
WARNING!
BEFORE ATTEMPTING TO WIRE THE UPS ENSURE ALL BREAKERS ARE IN THE OFF
POSITION.
Caution:
If your system uses external batteries, DO NOT mix batteries from different
manufacturers or mix different types of batteries. DO NOT use old and new batteries together.
Note:
In addition to the normal tools required for electrical installation you will need a PH2 Phillips
screwdriver to remove the UPS gland box and panels. Do not use a pozidrive (PZ) screwdriver.
To connect the UPS to your system:
1. If your system uses external batteries:
a. Check that the number of 12 V blocks in each string (positive and negative) is equal and matches
the number specified in your order.
b. Measure the battery voltage. The voltage should be approximately 192 Vd.c. for 16 batteries, 216
Vd.c. for 18 batteries and 240 Vd.c. for 20 batteries. [192Vdc / 16 batteries is default.]
2. On the rear of the unit, remove the bypass box (4 screws).
3. Remove the gland box cover.
4. Remove the terminal cover.
5. Feed all the cables through the gland box cover.
Caution:
Ring crimps are required on all wires to ensure the connections are secure.
Note:
Complete steps 6 and 7 in the order shown or you won’t be able to access the earth
terminals.
6. Wire the input and output earth cables to the UPS bypass box terminals. Ensure that both
connections are made.
7. Wire the input, output and battery cables to the UPS bypass box terminals.
WARNING!
CHECK THAT ALL CABLES ARE WIRED TO THE CORRECT TERMINALS. DO NOT
REVERSE THE INPUT LIVE AND NEUTRAL CONNECTIONS OR THE POLARITY OF
ANY OF THE BATTERY W IRES.
8. Refit all the covers and ensure all cable glands if fitted are fully tightened
9. Refit the bypass box to the UPS.
VFI-KT Series User Manual
