Duemmegi Domino DFANA-M/CC Quick Start Manual

DFANA-M/CC: Load-shedding controller
for Domino bus
DFANA-M/CC and DFANA-S modules allow the measure-
ments of several electrical parameters including the man-
agement of load-shedding, both for single-phase and
three-phase network. DFANA-M module interfaces directly
to the Domino bus, thus making the measurements imme-
diately available and easy to use. The measurements are
also shown on the front panel of DFANA-S by a back-light-
ed LCD display.
DFANA-M/CC module integrates an algorithm which, in
combination with relay output modules (e.g. DF4RI,
DF8RIT), creates a complete sequential load-shedding sys-
tem.
DFANA-M/CC reports on the Domino bus the 19 measure-
ments listed in the following table:
Measurement
Voltage phase 1 (*)
Current phase 1 (**)
Active power phase 1
Apparent power phase 1
Reactive power phase 1
Power factor phase 1
Voltage phase 2 (*)
Current phase 2 (**)
Active power phase 2
Apparent power phase 2
Reactive power phase 2
Power factor phase 2
Voltage phase 3 (*)
Current phase 3 (**)
Active power phase 3
Apparent power phase 3
Reactive power phase 3
Power factor phase 3
Total positive active energy (***)
(*): Voltages are sent on the bus multiplied x 10
(**): Currents are sent on the bus multiplied x 100
(***): Energy can be reset via bus
DFNA-M/CC module features a 2-way fixed terminal block
for the connection to Domino bus and a 3-way fixed termi-
nal blocks for the connection to DFANA-S module.
For information about terminal blocks, connections and the
several possible settings of the measurements section of
DFANA-S module, refer to the related User's Manual
(DFANA-S_xxMIT).
Near to the bus terminal block, DFANA-M/CC module fea-
tures a small pushbutton and a green LED that shows the
operating status; this LED normally flashes every 2 sec-
onds about to signal that the module is properly connected
to the bus. DFANA-M/CC module is housed in a standard
2M modular box for rail mounting
DUEMMEGI s.r.l. - Via Longhena, 4 - 20139 MILANO
Tel. 02/57300377 - Fax 02/55213686 –
Measured
Symbol
units
V1N
[V]
I1 [A]
P1 [W]
S1
[VA]
Q1
[VAR]
PF1 -
V2N [V]
I2 [A]
P2
[W]
S2
[VA]
Q2 [VAR]
PF2 -
V3N [V]
I3
[A]
P3
[W]
S3 [VA]
Q3 [VAR]
PF3
-
Wh(+)
[Wh]
www.duemmegi.it
Load-shedding operation
DFANA-M/CC module, as mentioned, allows to manage
the power consumption a three-phase (or single-phase)
electrical system, avoiding the intervention of the meter
protection due to the simultaneous switching on of loads
with excessive total power. DFANA-M/CC can manage up
to 24 different loads in three-phase mode and 8 loads in
single-phase mode. The module takes into account the dir-
ection of the current, therefore it can be used in systems
equipped with a photovoltaic generator. DFANA-M/CC
module can work both in systems with DFCP controller and
in the absence of this one.
The module continuously measures the total active power
absorbed by the connected loads and this value is com-
pared to the threshold value fixed during the setting up
through the support program BDTools or DCP Ide. If the
value exceeds the threshold, it begins to disconnect the
loads in sequence until the total power returns below the
threshold. The loads to be disconnected from the system if
the threshold is exceeded are connected to output modules
with power relays (e.g. DF4RI or DF8RIT) which, through
the Domino bus, are linked to the DFNA-M/CC module us-
ing equations programmed in the output modules.
If an overload occurs, the first load that is disconnected will
be number 24 (which must be with the one less important
for the user). Disconnection occurs 5 seconds after the
threshold is exceeded; in this case, if the overload condi-
tion still persists, the module will disconnect the sub-
sequent loads until the total power returns below the
threshold.
The reconnection of the last disconnected load takes place
in any case after a maximum time from its disconnection
(parameter TOff Max), or after a shorter time if the condi-
tions established by a precise algorithm exist.
However, it is possible to prevent a load from being discon-
nected, or it is possible to reconnect it after a disconnec-
tion, by acting on the relative point of the module output ad-
dress (see following paragraphs).
Rel.: 1.0 June 2021
Domino
DFANA-M/CC
Page 1 of 6