SA2005M
ssaammeess
OUTPUT SIGNALS
Multiplex Output (PH/ DIR)
LED Output (LED)
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.
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.
The PH/DIR output is used in conjunction with the LED driver
outputs to display information about each individual phase,
see figure 6.
VDD
LED
VSS
DR-01332
Phase LED Drivers (PH1, PH2, PH3)
t
LED
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:
Figure 4: LED pulse output
An integrated anti-creep function prevents any output pulses if
the measured power is less than 0.01% of the meters rated
current.
PH/DIR = 0 (Direction indication)
Motor Output (MOP, MON)
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.
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.
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.
VDD
MOP
VSS
VDD
MON
VSS
DR-01618
tm
2tm
tm
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.
Figure 5: Motor drive on MON and MOP pins of device
PH (Drive)
DIR (Sink)
PH/DIR
D1
D2
D3
D4
D5
D6
VFAIL 1
R9
VFAIL1
DIR1
VFAIL2
DIR2
VFAIL3
DIR3
Channel 1
DIR 1
PH1
VFAIL 2
R10
Channel 2
DIR 2
PH2
VFAIL 3
R11
Channel 3
DIR 3
dr-01603
PH3
Figure 6: Multiplexing of the LED Drivers
7/12
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