User`s guide

4. Operation

164201085 Rev. F0

TURN

AND

TEST

PROCEDURE

CONTINUED

3. If the inverter module is not already installed (Verify AC and DC breakers are OFF)

fully insert and seat the module into the chassis and tighten the thumbscrews.

4. Turn on the external disconnect provided by the installer; then turn on the AC circuit

breaker on the ZTT/Plus front panel.

5. The LCD panel indicates BATTERY BREAKER OPEN and the FAULT/STANDBY (red)

LED comes on.

6. Confirm the output voltage at the test points on the front of the chassis or through the

LCD panel.

7. Turn the DC circuit breaker on (up position closes the breaker).

8. Verify the LCD displays Normal Mode.

9. The unit is now operating normally. Use step 10 through step 13 to test standby

operation.

NOTE: If the charge level of the battery is too low, the unit will not transfer to

standby operation; the battery charges automatically. Allow the batteries to

charge and then perform the standby operation tests.

10. Turn off the AC circuit breaker on the front of the ZTT/Plus chassis.

11. The unit transfers to STANDBY mode. The FAULT/STANDBY (red) LED comes on and

the LCD panel displays STANDBY mode.

12. Turn on the AC circuit breaker.

13. After restoring AC power and waiting approximately 8 to 10 seconds for the ZTT/Plus to

phase lock to the incoming AC line, the unit transfers to the NORMAL mode. The

NORMAL (green) LED comes on, the FAULT/STANDBY (red) LED turns off, and the

LCD displays NORMAL mode.

The unit is now fully functional. Close and secure the cabinet.

4.1 Startup and Initial Test

, continued