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4–20kVA Users Guide P-164000669 4–20kVA Users Guide P-164000669—Rev 10
3.
Remove the six screws in the bypass switch front cover and remove the cover to gain access to the
terminal block for voltage measurements.
4.
If external battery cabinets are installed, ensure that the battery cabinet is plugged into its external AC
source (if applicable) and close the DC emergency disconnect switch button on the back of each external
battery cabinet. Insert the switch key supplied with the cabinet into the button and turn clockwise 1/2-turn.
Pull the button out to close the switch. Turn the key back counter-clockwise, and remove the key.
5.
The UPS front panel display automatically turns on whenever input power is present and at least one
power module is installed. Set up the initial operating parameters through the front panel display (see “
” ).
6.
Use an AC voltmeter to measure voltages on the terminal block inside the bypass switch cabinet. See
, which shows the terminal numbering for input and output UPS connections.
7.
Record your measurements in the following chart. The voltages in the first column should be nearly equal
to the voltages in the second column. If the values differ by more than a few volts, check the terminal
block connections and correct any wiring problems.
AC Line input
Measurement
AC from UPS Output
Measurement
L1 to L2 (11 to 12*)
7 to 8*
N to L1 (10 to 11*)
6 to 7*
N to L2 (10 to 12*)
6 to 8*
* For some installations, there is no connection at terminals 6, 8, 10, or 12.
8.
Determine what type of bypass switch you are using:
If the bypass switch is a Break-Before-Make type, skip this step and proceed to Step 13.
If the bypass switch is a Make-Before-Break type, verify that the AC voltages from the UPS and the AC line
input are in phase. Measure the voltage between the following points on the terminal block and record in
the spaces below. These measurements must be no more than 20 Vac; if they are, call your service
representative.
Terminal 7 to 11
Terminal 8 to 12
9.
Measure the AC voltage between the following points on the terminal block and record in the space
below. This reading must be no more than 1 Vac; if it is, call your service representative.
Terminal 6 to 10
10. Switch the bypass switch to LINE. Measure the voltage to the protected equipment (at the load
distribution panel) and verify that it is correct.
11. Switch the bypass switch to UPS and verify the voltage to the protected equipment is still correct.
12. Reinstall the bypass switch front cover and UPS front covers using the original screws.
13. If the UPS will not be operated immediately, switch the bypass switch to SERVICE and push in the DC
emergency disconnect switch button on the back panel of the external battery cabinet closest to the UPS.
Otherwise, continue to Step 14.
Summary of Contents for 9PXM8S4K
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