SA2005M Datasheet, PDF (6/12 Pages) Sames – Pin Selectable Three Phase Power / Energy Metering IC for Stepper Motor / Impulse Counter Applications with Anti Tamper Features

SA2005M
sames
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.
3600
LED pulses/kWh = 36.8 x RA x Imax x Vnom x 3
1000
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)
1
x
RE
3600
1
Motor pulses/kWh = 36.8 x RA x Imax x Vnom x 3 x
ImFactor
1000
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
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.
Imax
10
20
30
40
60
80
Vmax
230
230
230
230
230
230
RA
PH/DIR
PH/DIR
VDD
PH/DIR
VDD
PH/DIR
RE
PH/DIR or VDD
PH/DIR or VDD
PH/DIR or VDD
VSS or Open
VSS or Open
VSS or Open
IM
VDD
VDD
VDD
VDD
VDD
VDD
LED Pulse rate
(Pulses/kWh)
3200
1600
1600
3200
3200
1600
Motor Pulse
Rate (Pulses/kWh)
800
400
400
200
200
100
ANTI-TAMPER CONDITIONS
The SA2005M caters for the following meter tamper conditions, which are indicated as follows:
Method
Description
Result
Phase
Voltages
One LED is provided for each phase to indicate abnormal
operating conditions.
During normal conditions, the LEDs
are continuously switched on.
Phase Failure, In case of a phase failure, the corresponding LED is
no voltage switched off.
The SA2005M will record the energy
consumption accurately under this condition
Phase
Sequence
Error
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.
The SA2005M will record the energy
consumption accurately under this condition
Input / Output
Terminals
Interchanged
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.
Missing
Neutral
Connection
The architecture of the meter should provide for a good
"phantom neutral" in cases where the neutral is disconnected
from the meter.
Return
The SA2005M will therefore record the energy consumption
through Earth accurately under this condition.
Load
Imbalance
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The SA2005M will record the energy
consumption accurately under this condition
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