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4–20kVA Users Guide P-164000669 4–20kVA Users Guide P-164000669—Rev 10
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1.
If your unit is wired to an external BPM bypass switch, you must perform a voltage and phase check
(Steps 2 through 1 ). Otherwise, skip to Step 1 .
Before operating the bypass switch, use the following procedure to check the wiring for correct installation. To
prevent damage to the load, turn off the main circuit breaker in the load service panel or verify that the load
cannot receive power from the UPS.
If the UPS is in the standby mode and the bypass switch is in the LINE or UPS positions pressing the
red bypass switch interlock button will energize the UPS output.
Do not attempt to push the red interlock button or attempt to move the bypass switch handle if the
UPS is operating on battery power.
2.
At the bypass switch, press the red button and turn the switch to UPS.
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 (7 to 8*)
3 to 4*
N to L1 (6 to 7*)
2 to 3*
N to L2 (6 to 8*)
2 to 4*
8.
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 3 (AC From UPS Output) To Terminal 7 (AC To UPS Input)
Terminal 4 (AC From UPS Output) To Terminal 8 (AC To UPS Input)
Summary of Contents for 9PXM8S4K
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