ABB REG670 - Page 997

pulses can be reset to zero by activating RSTACC input or by using the local HMI reset
menu. The pulse on and off time duration is set by the settings tEnergyOnPls and
tEnergyOffPls. Figure
459 shows the logic for pulse output generation for the
integrated energy in the active forward direction. Similarly, the pulse generation for
integrated energy in the active reverse, reactive forward and reactive reverse is done.
S
a>b
a
b
Counter
Rst
CU
CV
X
q
-1
÷
÷
R I
R I
a>b
a
b
0
Counter
Rst
CU
CV
q
-1
EAFPULSE
RSTACC
EAFACC
T
F
t
tOff
TP
0
q
-1
tEnergyOffPls
EALim
EAFAccPlsQty
tEnergyOnPls
IEC13000188-4-en.vsd
q
-1
= unit delay
IEC13000188 V4 EN
Figure 459: Logic for pulse generation of integrated active forward energy
The maximum demand values for active and reactive power are calculated for the set
time interval tEnergy. The maximum values are updated every minute and stored in a
register available over communication and from outputs MAXPAFD, MAXPARD,
MAXPRFD and MAXPRRD for the active and reactive power forward and reverse
direction. When the RSTDMD input is active from the local HMI reset menu, these
outputs are reset to zero. The energy alarm is activated once the periodic energy value
crosses the energy limit ExLim. Figure 460 shows the logic of alarm for active forward
energy exceeds limit and Maximum forward active power demand value. Similarly,
the maximum power calculation and energy alarm outputs in the active reverse,
reactive forward and reactive reverse is implemented.
1MRK502052-UEN B Section 17
Metering
991
Technical manual