gefran 3850T Use And Installation Manual page 47

Warning! The DO field shows information on each
single digital output, while the PID field shows
totals for all outputs used during the PID.
The two calculations are independent. If the en-
ergy consumption parameter of a DO (al-
ready used by the PID) is set, the total ener-
gy count will consider that of the DO twice.
The DO energy section allows you to add the power of the
load managed for each output.
To view the outputs of the various modules ( F-MIX and
R-EU16), use the + button.
To enter the power, touch the field next to the output num-
ber and enter its value.
The data will be used for Synoptic section views.
For each of the 16 PID, the PID energy section lets you add:
• PID heating power (Heat);
• the supply voltage (Voltage), which allows for a more
precise calculation of power (power = current x volt-
age);
• PID cooling power (Cool);
To enter power and voltage, touch its field next to the PID
number and enter its value.
The data will be used for Synoptic section Monitor.
NOTES
- If a cascade PID occupies PIDs n and n+1, the energy
parameter setup will be set ONLY on PID n+1.
- Power may be counted in two ways for the hot PID (set-
ting rated power or using TAs) and one way for the cold one
(setting rated power).
80703B_MHW_2850T/3850T_02-2019_ENG
ENERGY CALCULATION WITH TA
Energy is calculated on the basis of the current reading
obtained from the TAs connected to the PID in question.
The voltage to be entered is the supply line RMS voltage.
So if it is single-phase, set 230V, or if it is three-phase, set
400V (in Europe).
To associate CT input to the PID, refer to the configuration
page of the HB alarms, paragraph "4.15.4.8. PID HB alarm
configuration" on page 86
If the load is single-phase (there must be only one CT set
for each PID), multiply the rms current value supplied by the
TAs by the concatenated (line) voltage.
If it is three-phase (with 2 TAs set per PID), multiple the
average of the two rms current values supplied by the 2 TAs
by the set voltage, by the square root of three.
P=V*(IrmsTA1+IrmsTA2)/2)*sqrt(3).
In both cases, the value thus obtained is multiplied by the
percentage of power supplied by the PID in question and
operates independently of the DO outputs.
IMPORTANT: in this assumption, the calculation is reliable
only for actuators using zero crossing.
The active power calculated is in any case an approxima-
tion, in that we suppose:
- that the load is totally resistive (cosfi approximately one)
and balanced.
- that the grid is symmetrical and supplies an effective value
that remains constant over time.
4. CONFIGURATION
45