sames

sames

SA2005M

http://www.sames.co.za

6/12

Return

through Earth

Load

Imbalance

Phase

Voltages

During normal conditions, the LEDs

are continuously switched on.

Phase Failure,

no voltage

The SA2005M will record the energy

consumption accurately under this condition

Phase

Sequence

Error

Method

Result

The SA2005M will record the energy

consumption accurately under this condition

Input / Output

Terminals

Interchanged

The SA2005M will record the energy

consumption accurately under this condition

Missing

Neutral

Connection

In this case, the meter would register the

energy consumption correct.

A indication for this condition could be

realized external to the IC.

The SA2005M will record the energy

consumption accurately under this condition

One LED is provided for each phase to indicate abnormal

operating conditions.

In case of a phase failure, the corresponding LED is

switched off.

In case of phase sequence error, the phase LED’s are flashing

with a repetition rate of approximately 1Hz. The direction LED’s

will show which phases is swapped, by switching the corres-

ponding two direction LED’s off. A connection of a line voltage

to the neutral terminal would be indicated in the same way.

Description

One LED is provided for each current sensor to indicate

reverse energy flow. If detected, the corresponding LED is

switched off. The SA2005M can be configured to accumulate

the absolute energy consumption for each phase measured,

irrespective of the direction of the energy flow.

The architecture of the meter should provide for a good

"phantom neutral" in cases where the neutral is disconnected

from the meter.

The SA2005M will therefore record the energy consumption

accurately under this condition.

ANTI-TAMPER CONDITIONS

The SA2005M caters for the following meter tamper conditions, which are indicated as follows:

Using the RA, RE and IM inputs

The following formulas can be used to calculate the LED

output and motor pulse rates. Note that for the motor pulse

rates shown in the datasheet a MOP pulse followed by a

MON pulse is treated as two energy pulses.

The following table shows the combinations for some the common rated conditions. IM is selected so that the counter increments to

the highest possible rate.

10

20

30

40

60

80

230

230

230

230

230

230

PH/DIR

PH/DIR

VDD

PH/DIR

VDD

PH/DIR

PH/DIR or VDD

PH/DIR or VDD

PH/DIR or VDD

VSS or Open

VSS or Open

VSS or Open

VDD

VDD

VDD

VDD

VDD

VDD

3200

1600

1600

3200

3200

1600

800

400

400

200

200

100

Motor Pulse

Rate (Pulses/kWh)

LED Pulse rate

(Pulses/kWh)

IM

RE

RA

Vmax

Imax

LED pulses/kWh = 36.8 x RA x

Where:

Imax = Meters maximum rated current

Vnom = Meters nominal voltage

RA = 1/3, 2/3 or 3/3 (see Rated RA section)

RE = 1 or 4 (see resolution RE section)

3600

Imax x Vnom x 3

1000

1

RE

x

Motor pulses/kWh = 36.8 x RA x

Where:

Imax = Meters maximum rated current

Vnom = Meters nominal voltage

RA = 1/3, 2/3 or 3/3 (see Rated RA section)

ImFactor depends on IM:

IM = VDD then ImFactor = 16

IM = PH/DIR then ImFactor = 160

IM = VSS then ImFactor = 1600

3600

Imax x Vnom x 3

1000

1

ImFactor

x