ABB REG670 - Page 996

T
F
STARTACC
ACCINPRG
RSTACC
³1
q
-1
STOPACC
&
FALSE
&
EnaAcc
IEC13000186-4-en.vsd
q
-1
= unit delay
IEC13000186 V4 EN
Figure 457: ACCINPRG Logic diagram
The accumulated energy values (in MWh and MVArh) are available as service values
and also as pulsed output depending on the ExxAccPlsQty setting, which can be
connected to a pulse counter. Accumulated energy outputs are available for forward
as well as reverse direction. The accumulated energy values can be reset to initial
accumulated energy values (ExxPrestVal) from the local HMI reset menu or with the
input signal RSTACC. Figure
458 shows the logic for integration of energy in active
forward direction. Similarly, the integration of energy in active reverse, reactive
forward and reactive reverse is done.
T
F
T
F
T
F
S
X
60.0
q
-1
0.0
q
-1
&
RSTACC
EAFPrestVal
ACCINPRG
P* (ACTIVE FORWARD)
EAFACC
a>b
a
b
EALim
IEC13000187-4-en.vsd
q
-1
= unit delay
IEC13000187 V4 EN
Figure 458: Logic for integration of active forward energy
The energy pulses generated by using internally calculated accumulated energy
values and energy per pulse (ExxAccPlsQty) setting. The accumulated energy values
are divided by the energy-per-pulse value to get the number of pulses. The number of
Section 17 1MRK502052-UEN B
Metering
990
Technical manual