User`s guide

32
4. Operation
164201085 Rev. F0
The ZTT/Plus UPS can operate in NORMAL mode (AC operation) with the inverter module
removed. The module can be safely removed without disturbing the output.
To prevent outages and improper operation:
1. Turn the DC circuit breaker off (down) before removal or installation.
2. Remove the inverter module by loosening the thumbscrews and pulling the handle.
Leave the DC circuit breaker off.
3. When installing, verify the DC circuit breaker is OFF, then fully insert and seat the
module and tighten the thumbscrews, then turn the DC Circuit breaker on (up).
4.3 Front panel
The following tables describe the front panel LEDs, connectors, and the LCD panel.
TEST JACKS
DC CIRCUIT BREAKER
AC CIRCUIT BREAKER
EXTERNAL LED CONNECTOR
LCD PANEL
LCD CONTROL BUTTONS
GREEN (NORMAL) LED
RED (FAULT/STANDBY) LED
YELLOW (ALARM) LED
STATUS MONITOR
INTERFACE CONNECTOR
4.2 Inverter Module Removal
Figure 4-2 Front panel controls, ZTT/Plus Power Supply
DESCRIPTIONMODE
The Normal LED is green and on when the ZTT/Plus
determines utility power is present and usable. This
indicates output power is coming from AC input (utility).
NORMAL (AC operation)
The Alert LED is yellow and on when there is a UPS alarm
condition. See the following LCD table for alarm
descriptions.
ALERT
The Fault/Standby LED is red and on when the ZTT/Plus
is running on battery power (Standby mode) or when the
ZTT /Plus diagnoses a module fault condition. See the
following LCD table for fault conditions and descriptions.
FAULTS/Standby
Used for connecting to external LEDs (Normal and Fault/
Standby), typically located on the front of the cabinet door.
External LED Connector
Used for connecting to the optional Status Monitor
Interface module or directly to status monitoring
transponders (certain manufacturers only).
Status Monitor Interface
DESCRIPTIONCONNECTOR