SA9607M

http://www.sames.co.za.

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INPUT SIGNALS

VREF

The VREF pin is the reference for the bias resistor and is the

recommended point for calibration. With a bias resistor of

24k

Ω optimum conditions are set. It may be varied within

±10% for calibration purposes. Any changes to the bias

resistor will affect the output pulse rate quadratically (i.e.

(R

= +5%,

(f=10%).

Motor pulse rate select (MP1 and MP0)

The pulse rate of the motor driver ouput of the SA9607M is

selected by the inputs MP1 and MP0. Three pulse rate options

are available as shown in the following table:

Pulse rate selection

OUTPUT SIGNALS

Motor output (MOP, MON)

The MON pulse will follow the MOP pulse within 142ms. This

prevents that the motor armature is in the wrong position after

a power failure. Both MOP and MON outputs are active high.

The motor drive wave forms are shown below:

LED output (LED)

The LED output pulse at a fixed rate of 6400 pulses per kWh.

The LED output is active low. The LED waveform is shown

below:

Please note that the device will not perform metering functions

as described in this document while in test mode.

Rated condition select (RATED)

The rated condition select pin gives the option of having a

3:2:1 scaling ratio of the rated current easily available. This

feature is particularly useful in circumstances where a

manufacturer requires a meter for use in a system rated for

two different conditions, for example 230V/60A and 230V/

40A. With the rated condition select the SA9607M allows for

the development of different rated meters requiring minimal

changes. The following table below lists the options available

(assuming the rated condition to be 230V/60A).

Rated condition select (RATED)

Motor drive

output

selection

Unit

MP1

MP0

V

SS

V

SS

V

DD

V

DD

V

SS

V

DD

V

SS

V

DD

1

10

100

Device test

mode

pulses/kWh

pulses/kWh

pulses/kWh

Pulse Rate Selection

Input

Signal Input RATED

V

SS

OPEN

V

DD

Rated Conditions

230V / 20A

230V / 40A

230V / 60A

Figure 5: Motor drive waveform

t

VD D

VD D

VSS

VSS

MON

MOP

t

m

t

m

t

m

D R -01 559

Figure 4: LED pulse output

t

VD D

VSS

LED

D R - 01332

Selected input indication (SEL1)

The SA9607M continuously compares the power consumptions

on current channel 1 inputs and current channel 2 inputs. The

larger of the two measurements are used for metering. The

SEL1 output pin indicates which channel is currently being

used for the pulse output.

Signal

Output

Description

0

1

Channel 1selected (IIN1/IIP1)

Channel 2selected (IIN2/IIP2)

SEL1

Value