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UPS Startup
54
Powerware
®
9170 User's Guide S LTM-1344 B Uncontrolled Copy
9. Use an AC voltmeter to measure voltages on the terminal block
inside the bypass switch cabinet. See Figure 22 on page 32,
which shows the terminal numbering for input and output UPS
connections.
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.
10. If the bypass switch is a Break-Before-Make type, skip this step
and proceed to Step 11.
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. These measurements must be no more than
20 Vac; if they are, call your service representative.
Terminal 7 to 11
Terminal 8 to 12
11. Measure the AC voltage between the following points on the
terminal block. This reading must be no more than 1 Vac; if it
is, call your service representative.
Terminal 6 to 10
12. Switch the bypass switch to LINE. Measure the voltage to the
protected equipment (at the load distribution panel) and verify
that it is correct.
13. Switch the bypass switch to UPS and verify the voltage to the
protected equipment is still correct.
14. Reinstall the cover on the bypass switch, and tighten all cover
screws.