User's Manual

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REX Meter
2 Product Description Technical Manual
2-8 30 November 2006
Main Circuit Board
The main circuit board consists of the following components:
■ LCD
■ power supply
■ EEPROM
■ meter engine
■ microcontroller
■ 900 MHz radio
■ supporting electronics
See “General Theory of Operation” on page 2-2 for an explanation of the general
operation of the REX meter.
Circuit Board Support Frame
The REX meter circuit board support frame is designed to house the main circuit
board and up to three option boards efficiently and conveniently. Two option
boards can be installed above the main circuit board and one below the main
circuit board using the circuit board support frame.
Meter Base
The meter base contains the following components:
■ base housing
■ current and voltage blades
■ either 1 or 2 current sensing transformers (depending on form)
■ disconnect link (Form 2S meters only)
■ hanger
Table 2-2 shows the available ANSI compatible configurations for a socket-
connected (S-base) REX meter according to the type of service being metered.
Table 2-2. REX meter available wiring forms
Meter style
1
Form Test
Amps
Class Elements K
h
Type of service
ZCA3xxxxxxx 1S 30 200 1 1.0 2-wire single phase
ZCA4xxxxxxx 1S 50 320 1 1.0 2-wire single phase
ZCC3xxxxxxx 2S 30 200 1 1.0 3-wire single phase
ZCCWxxxxxxx
2S 30 200 1 1.0 3-wire single phase (without voltage disconnect
link)
ZCC4xxxxxxx 2S 50 320 1 1.0 3-wire single phase
ZCA2xxxxxxx 3S 2.5 20 1 1.0 2- or 3-wire single phase
ZCC2xxxxxxx 4S 2.5 20 1 1.0 3-wire single phase
ZC5Wxxxxxxx 12S 30 200 2 1.0 3-wire wye, network meter (without voltage
disconnect link)