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October 2012
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.
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
IL42-4031C
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Related Manuals for Elster ALPHA Plus
Summary of Contents for Elster ALPHA Plus
- Page 1 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...
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Page 2: Installation
IL42-4031C October 2012 ALPHA Plus and A3 ALPHA meters are available in FT-21 cases for the following wiring configurations: • 3-phase 3-wire (2 element equivalent) - see Figure 2 • 3-phase 4-wire wye (2 1/2 element equivalent) - see Figure 3 •... -
Page 3: Interface Connections
October 2012 IL42-4031C Figure 1. FT-21 case and mounting Approximate Unit Weight: 10 lbs. (4.6 Kg) Approximate Shipping Weight: 12 lbs (5.6 Kg) Interface Connections It is the user's responsibility to apply the correct interface connectors, wired properly, to use the communications features supplied per the figures listed in Table 1-1, Table 1-2, and Table 1-3. - Page 4 To determine the options supplied on the removable switchboard chassis, refer to the style coding in the upper left corner of the nameplate. For the A3 ALPHA meter the style coding begins with ZD and for the ALPHA Plus meter the style coding begins with ZQ (Fields 1 and 2).
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Page 5: Communications Cables
The switchboard meter is largely maintenance-free, with the exception of the battery used on some styles. A 3.6 volt lithium battery is used in conjunction with a supercapacitor to maintain real time clock operations of the ALPHA Plus and A3 ALPHA meters during power interruptions. - Page 6 Replace the switchboard meter chassis in the case. Close the metering switches and install the cover. If you like, you can use Elster Electricity meter support software to reset the power outage log. Replacing the outage reporting battery The optional internal modem with outage reporting capabilities has a lithium battery present to provide energy for modem operation during a power outage.
- Page 7 October 2012 IL42-4031C Figure 2. 3-phase, 3-wire (2-element equivalent) Figure 3. 3-phase, 4-wire Wye (2½ element equivalent)
- Page 8 IL42-4031C October 2012 Figure 4. 3-phase, 4-wire Wye (3-element equivalent)
- Page 9 October 2012 IL42-4031C Figure 5. FT-21 case with single KYZ relay...
- Page 10 IL42-4031C October 2012 Figure 6. FT-21 case with terminal block outputs relay communications options options terminal block terminal block The FT case terminals 21-44 support wire size 26-14 AWG.