Callout Component Name
Description
1
Heatsink FRU
Assembly for 6KW,
8KW
Behind hinged panel
for all others
Power board (A1)
The power board is bolted onto the Insulated Gate
Bipolar Transistor (IGBT) blocks mounted on a heat
sink. The complete heat sink assembly with IGBTs
and power board is a single Field Replaceable Unit
(FRU) that converts all the power:
Input AC power converted to DC bus.
Battery power boosted to DC bus.
DC bus power converted to output AC power using
PWM technology for a smooth AC sine wave.
If a catastrophic failure occurs, the heat sink
assembly can be replaced using only a screwdriver.
The power board also has the housekeeping power
supplies and drivers for the IGBTs. The entire
assembly provides the landing place for all internal
input, output, DC cables, and metering devices for
controlling and monitoring the unit input and output
currents.
Bypass static switch
(PB2)
Bypass static switch is closed only upon inverter fault
or output overload condition.
Inverter static switch
(PB1)
The SCR solid-state switch connects the output of the
inverter (UPS) to the load. It is connected on the
primary side of the optional output isolation
transformer. If problem or failure occurs in the unit,
this switch shuts off and transfers the load directly to
the utility input via the bypass static switch. It
maintains its status opposite to that of the bypass
switch.
2
Input 2-Pole terminal block (TB1)
Customer Input power connection. See 4.3.6 (page
32)
3
Ground Lug (Input and Output)
2-barrel lug for Input and Output Ground. See 4.3.6
(page 32)
4
Output 2-Pole / 3-pole terminal block (TB1)
Customer output connection. See 4.3.6 (page 32)
5
Control board (A2)
The microprocessor with unit specific firmware and
control circuitry is located on the Control Board. The
Control Board is mounted on the cabinet door and
communicates with the Power Board (A2) via a ribbon
cable. It monitors the input and output voltages and
generates the command to close or open the input
contactor and to sense and change the status of the
bypass static switch. The Control Board sends data to
the LCD panel located on the door where actual
status and parameters are displayed. It additionally
provides optional AS400, RS232, and RS485 output
capabilities and supports various communication
including SNMP options.
6
LCD display panel
Provides continuously updated input, output, battery
metering and alarm data, and UPS status for
customer use on a constantly scrolling set of 2 default
screens.
Beghelli U.S.A., 3250 Corporate Way, Miramar, Florida, Tel: (800) 726-4316 Tel: (954) 442-6600 Fax: (954) 442-6677
NOVA
6, 8, 10, 15 & 17KW