9
105.4 Electronics Cabinet Voltage Check
Using a digital volt-ohm meter, check for correct nominal battery voltage between electronics cabinet DC Input NEG and POS wires.
Refer to table in section
105.3
for proper system DC voltage. Voltage reading should be ±10% of system DC voltage.
106. AC Connections
CAUTION:
a. All Inverter system units contain hazardous AC and DC voltages. Because of these voltages, a qualified electrician must install the
Inverter system, AC line service, and batteries. The electrician must install the AC line service according to local, state and NEC codes
and must be familiar with batteries and battery installation.
b. Before installing, maintaining, or servicing the unit, always remove or shut off all sources of AC and DC power and shut off the
Inverter system. Disconnect AC line input at the service panel and turn off the Main DC Switch and the Main AC Switch to make sure
the unit will not supply output voltage.
c. Whenever AC and/or DC voltage is applied, there will be AC voltage inside the Inverter system unit; the unit can supply
power from AC line or from its batteries. To avoid equipment damage or personal injury, always assume that there may be voltage inside
the Inverter system.
d. Remove rings, watches, and other jewelry before installing the AC wiring. Always wear protective clothing and eye protection and use
insulated tools when working near batteries. Whenever servicing an energized unit with the inside panel open, electric shock is
possible; follow all local safety codes.
TEST BEFORE TOUCHING!
e. To reduce the risk of fire or electric shock, install the Inverter system and the batteries in a temperature-controlled and
humidity-controlled indoor area free of conductive contaminants. See Section
103
for operating environment specifications.
106.1 AC Wiring Preparations
1. Remove the system's front cover. Make sure all breakers are in the off position.
2. Make sure the Inverter system input and output voltages are correct for the particular application. Remember that the
Inverter system provides single-phase power only.
3. The input circuit breaker in the input service panel provides the means for disconnecting AC to the Inverter system.
Only authorized persons shall be able to disconnect AC to the unit. (See NEC 700-20 and 700-21.)
CAUTION:
To prevent electrical shock
or equipment damage, for all units, the Main AC Switch, the Main DC Switch, all output circuit breakers, and the AC input at the service
panel are all off before making AC connections to the Inverter system.
4. If not previously done, remove knockouts for AC Input and AC Output in the top or left side of the Inverter system
(See
Fig. 1
in Section
104.4
).
CAUTION:
Do not drill the cabinet; drill filings may damage the unit and prevent it from operating. If
larger knockouts are needed, use a chassis punch to enlarge the appropriate knockout. Do not add additional or unnecessary knockouts.
5. Install the input and output conduits.
6. Run the AC Input service conductors and AC Output conductors through separate conduits. Inverter system emergency
output circuits shall be installed in dedicated conduit systems and not shared with other electrical circuits as described in NEC
700-9(b).
106.2 AC Input and AC Output Connections
Make all AC input and output connections to the Inverter system as indicated on the labels within the cabinet.
Circuit Breaker
Access Door
LED Status
Indicator Panel
Fig. 6
Installer Connections
Building Ground
Line In
Neutral In
Load 2 Neutral Out
Load 1 Neutral Out
AC Output Breaker 2
AC Output Breaker 1
Load 2 Line Out
Load 1 Line Out
Terminal Block 1
