SAMES PM9105AFA, PM9105AFE Datasheet

SA9105 APPLICATION NOTE

sames

PM9105AF

THREE PHASE POWER/ENERGY METERING MODULE

PULSE OUTPUT

FEATURES

n Performs one, two or three phase power

and energy measurement

n Meets the accuracy requirements for

Class 1 AC Watt hour meters

n Operates over a wide Temperature

Range

DESCRIPTION

The SAMES three phase power/energy metering module, the PM9105AF provides three
pulse rate output options, the frequency of which are proportional to the active power
consumption.

Energy consumption can be determined by the power measurement being integrated
over time.

The method of calculation takes the power factor into account.
The output of this innovative universal three phase power/energy metering circuit is

ideally suited for energy calculations in applications using a µ-controller or mechanical
counter.

The application utilises the SAMES SA9105AF, SA9105EF or SA9105FF three phase
power metering integrated circuits for power measurement.

n Uses current transformers for current

sensing

n Three pulse rate outputs available
n Protected agianst ESD

4310 PDS038-SA9105-001 Rev. B 13-09-95

1/10

PM9105AF

BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS *

Parameter Symbol Min Max Unit

Supply Voltage (Note 1) V
Storage Temperature T
Operating Temperature (Note 2) T

AC

STG

O

-25 +125 °C

-10 +70 °C

540 V

Note 1: Voltages are specified with reference to Neutral.
Note 2: The SA9105 integrated circuit is specified to operate over the temperature

range -10°C to +70°C. The module functionality will however depend upon
the external components used.

* Stresses above those listed under "Absolute Maximum Ratings" may cause permanent

damage to the device. This is a stress rating only. Functional operation of the device
at these or any other conditions above those indicated in the operation sections of this
specification, is not implied. Exposure to Absolute Maximum Ratings for extended
periods may affect device reliability.

2/10

sames

PM9105AF

ELECTRICAL CHARACTERISTICS

(Over the temperature range -10°C to +70°C, unless otherwise specified. Power
consumption figures are applicable to the PM9105AFE only.)

Parameter Symbol Min Typ Max Unit Condition

Supply Voltage (x3 Phases) V

AC

180 230 265 V PM9105AFE

(Continuous) 90 115 138 V PM9105AFA
Frequency Output FOUTX Refer to applicable IC data sheet

Power Consumption

1

100 mW VDD = 5V

Note 1: Power consumption specifications exclude power consumed by the current

sensors.

CONNECTION DESCRIPTION

Designation Description

PL5 Voltage Supply connected to Phase 1

Voltage Supply connected to Phase 2
Voltage Supply connected to Phase 3
Voltage Supply connected to Neutral Line (Common)

PL6 Power Output: 4Hz at rated current

Power Output: 290 Hz at rated current
Power Output: 1160 Hz at rated current
0V (Common)

PL4 5V DC Supply Voltage

0V DC Supply Voltage
CT1 Phase 1 (Direction indicated on PCB)
CT2 Phase 2 (Direction indicated on PCB)
CT3 Phase 3 (Direction indicated on PCB)

FUNCTIONAL DESCRIPTION

1. Power Calculation

In the Application Circuit (see Figure 2), the output currents from the current sensors
will be between 0 and 16µA. The current input stages saturate at input currents
greater than 18µA

. The mains voltage (mains voltage + 15% - 20%) is used for

RMS

the power calculation, together with the current information from the current sensors
(current transformers).

The calculated power for the 3 phases is integrated over time and converted into a
corresponding frequency.

sames

3/10