Powerware 9170+ User Manual

Page 58

UPS Startup

Powerware

9170 User's Guide

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.