1.0 Introduction (continued)
Internal Electronic Assemblies
The unit is comprised of two or three major
subassembly boards; main power board,
optional modem board and display board.
All three circuit cards are mounted inside
either a NEMA 12/13 or NEMA 4X enclosure.
NOTE: Units supplied in a NEMA 12/13
metal enclosure are suitable for indoor
applications only. Units supplied in a
NEMA 4X fi berglass enclosure are suitable
for either indoor or outdoor applications, within the defi ned specifi cations.
Refer to section 2.0 for a defi nition of suitable environmental conditions for
indoor and outdoor units.
Main Power Board
Connections to this board include the MAINS input voltage and current sensors.
The MAINS input terminals are covered with a protective clear shield for safety
purposes. The current sensor assemblies interface to three header
connectors, TB2, TB3 and TB4. Each header connector input corresponds to
an input voltage phase therefore care
must be exercised to ensure each
current sensor is connected to the
correct input header.
Display Board
The display board interconnects to the main power board via a fl ex ribbon cable
and the board mounts on the inside of the housing door. The only required
connection is for RS485 communications. When operated as a stand-alone
unit using the optional modem for communications, the RS485 connections are
not required. The display board LCD readout cycles through the available data
which is described later.
Optional Modem Board
The optional modem module is mounted to the main power supply board via four
standoffs. At the bottom of the module is an RJ44 (4-wire) connector used to
interface cable to a phone line. The optional modem is confi gured to operate at
9600 Baud, No parity, 8 Data Bits and 1 Stop Bit.
Page 3
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