October 2012 IL42-4031C
Elster
Raleigh, North Carolina United States
+1 800 786 2215 (US toll free)
+1 905 634 4895 (Canada)
support@us.elster.com
www.elster.com
ALPHA Plus
®
and A3 ALPHA
®
Switchboard Meters
with the CPS Power Supply
General
This leaflet contains general installation instructions for ALPHA Plus and A3 ALPHA meters with the CPS power supply in FT-21 cases. The
electronic module used in the switchboard meter is the same as is used in the corresponding socket or A-base meter. This leaflet does
not discuss the electronic assembly–refer to the technical manual for the specific meter: ALPHA Plus Meter Technical Manual (TM42-2182
or TM42-2185 [Canadian]) or A3 ALPHA Meter Technical Manual (TM42-2190 or TM42-2195 [Canadian]) for information about the
electronic assembly.
The meter is mounted on a removable chassis, which is held in the case by two latches. All metering connections between the case and
the chassis are made through the test switches.
To prevent electrical shock and bodily injury, automatic shorting switches are provided on all current circuits so
that current transformers are not inadvertently opened when you test or remove the chassis.
The voltage and current inputs to the switchboard meter are located on the rear of the case. The switchboard meter has an operating
range of 96 to 528 Vrms. The maximum current is 20 A.
An optional AnyPhase™ power supply is available for A3 ALPHA meters. When equipped with the AnyPhase power supply, the meter
will operate as long as voltage remains on any two voltage input connections (phase-phase or phase-neutral).
When using the AnyPhase power supply on 4-wire wye applications, the absolute phase-phase voltage must not
exceed 528 V. Meters with the AnyPhase power supply cannot be used on 347/600 V services.
Provisions have been made for optional relay outputs and optional communications. One optional relay output has a three-terminal
molded insulation block installed in three knockouts at the top back of the case (Figure 5). This is the configuration used for a single KYZ
output from the meter (when supplied).
A separate FT case configuration is provided for any meter that has either: 1) a communication output; or 2) two or more relay outputs.
This configuration uses a 24-position connector mounted on the chassis with a mating connector mounted in the back of the case.
Signals from the case-mounted connector go to two 12-pin terminal blocks on the back of the case (Figure 6). Terminal block positions are
identified by number (numbered 21 through 44) rather than by function. The function of the individual terminal is dependent on the
particular configuration of the ALPHA module or switchboard chassis. Some terminal numbers have different functions depending on the
supplied relay and communications options. See the following figures for specific function terminal numbers: Figure 7, Figure 8, Figure 9,
Figure 10, Figure 11, and Figure 12.
To Next Page
Need help?
General
