sames

sames

SA2005M

http://www.sames.co.za

7/12

Figure 6: Multiplexing of the LED Drivers

D1

VFAIL1

D3

VFAIL2

D4

DIR2

D2

DIR1

D5

VFAIL3

D6

DIR3

R9

R10

R11

PH/DIR

PH1

PH2

PH3

DIR 1

DIR 2

DIR 3

DIR (Sink)

PH (Drive)

VFAIL 1

VFAIL 2

VFAIL 3

Channel 1

Channel 2

Channel 3

dr-01603

Figure 5: Motor drive on MON and MOP pins of device

VDD

VDD

VSS

VSS

MON

MOP

t

m

t

m

2t

m

DR-01618

Figure 4: LED pulse output

LED

t

LED

DR-01332

VDD

VSS

OUTPUT SIGNALS

LED Output (LED)

Various LED output pulse rates are available. Refer to the

“Using the RA, RE and IM inputs” section. With RA pin open the

LED output is 1252Hz at rated conditions. In this mode t

is

LED

71uS, for the other pulse rate options t

is 10ms. The LED

LED

output is active low as shown in figure 4.

An integrated anti-creep function prevents any output pulses if

the measured power is less than 0.01% of the meters rated

current.

Motor Output (MOP, MON)

The motor pulse width is fixed at 142ms. The MON pulse will

follow the MOP pulse within double the pulse width time. This

prevents the motor armature is in the wrong position after a

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

low voltage stepper may be driven directly from the device by

connecting it between the MOP and MON pins, alternatively

an impulse counter may be driven directly by connecting it

between MOP and V . The motor drive waveforms are shown

SS

in figure 5.

Multiplex Output (PH/ DIR)

The PH/DIR output enables either direction or voltage

information on the phase LED driver outputs (PH1, PH2 and

PH3). This multiplex output switches between logic 0 and 1 at a

frequency of approximately 113Hz. A logic 0 enables energy

direction information on the LED driver outputs and a logic 1

enables voltage information.

The PH/DIR output is used in conjunction with the LED driver

outputs to display information about each individual phase,

see figure 6.

Phase LED Drivers (PH1, PH2, PH3)

The LED driver outputs present either direction information or

voltage information. The three LED driver outputs are used in

conjunction with the PH/DIR output to display information

about each individual phase (refer to figure 6) as follows:

PH/DIR = 0 (Direction indication)

When PH/DIR is low (logic 0) energy direction information for

each individual phase is available on PH1, PH2 and PH3. A

logic 1 indicates reverse energy flow and a logic 0 indicates

positive energy flow. Reverse energy flow is defined as the

condition where the voltage sense input and the current sense

inputs are out of phase (greater than 90 degrees). Positive

energy flow is defined as the condition where the voltage

sense and current sense inputs are in phase.

PH/DIR = 1 (Voltage fail / phase sequence error)

When PH/DIR is high (logic 1) voltage information is available

on PH1, PH2 and PH3. A logic 1 on any of these pins indicates

a voltage failure, the SA2005M does not detect a zero crossing

on the applicable voltage sense input. Referring to figure 6 the

voltage fail LED will be on when the voltage phase is present

and off when the voltage phase is missing.

In the case of a phase sequence error all three LED driver

outputs PH1, PH2 and PH3 will pulse with a repetition rate of

approximately 1Hz.