Datasheet

STPMC1 Theory of operation
Doc ID 15728 Rev 7 37/77
9.14 Negative power accumulation (configuration bit ABS, status
bit
SIGN )
The ABS bits govern energy accumulation in case of negative power; they only affect active
power P and fundamental active power F.
The 3-ph status bit
SIGN depends upon 3-ph cumulative power direction while the phase
status bits
SIGN
X
depends upon phase X power direction.
Tabl e 22 shows power calculation modes according to ABS
9.15 Phase delay calculation
The STPMC1 allows the calculation of the phase delays between voltages. If the line
frequency f
line
is 50 Hz, a 120° phase delay corresponds to 6.7 ms.
Table 21. LED pin configuration for APL
= 2, 3
APL (2 bits) KMOT (2 bits) LED energy output Phase Freq
2 - Active energy wide band P 3-ph C
3
0
Active energy wide band P 3-ph
C/64
1C/128
2C/32
3C/256
Table 22. Accumulation mode for negative power
ABS
(2 bits)
Accumulation mode Power calculation 3-ph SIGN MA - MB
0 3-phase Ferraris mode P
Σ
= P
R
+ P
S
+ P
T
P
Σ
< 0 → SIGN = 0
P
Σ
≥ 0 → SIGN = 1
P
Σ
< 0 → MA and MB low
P
Σ
≥ 0 → see Figure 12
1
Absolute accumulation per
phase
P
Σ
= |P
R
| + |P
S
| + |P
T
|P
Σ
≥ 0 → SIGN = 1 P
Σ
≥ 0 → see Figure 12
2 Ferraris mode per phase
if P
X
< 0 → P
X
= 0
P
Σ
= P
R
+ P
S
+ P
T
P
Σ
≥ 0 → SIGN = 1 P
Σ
≥ 0 → see Figure 12
3 Signed accumulation P
Σ
= P
R
+ P
S
+ P
T
P
Σ
< 0 → SIGN = 0
P
Σ
≥ 0 → SIGN = 1
P
Σ
< 0 → see Figure 12
P
Σ
≥ 0 → see Figure 12