Contrel EMA11, User Manual, Page: 50 / 58

EMA11 - USER MANUAL
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11.8) DIGITAL OUTPUT
The digital outputs can be programmed to function like alarm (overload,
load management for consumption optimization, etc.), or pulses emission
for energy calculation or remote activation using software NRG.
•
Out Index , expresses the number of output, from 1 to 6 (DO1 and DO2
standard), to select or program, which are present on the hardware of the
instrument.
•
Type , allows to select the type of functioning as:
- Always Off: digital output is always disabled.
- Energy Pulse: pulse emission proportional at energy registered and depending the programming
used (valid only for Energies).
-
Min. Threshold: the output is enabled if the value of the selected variable is lower of the
programmed value.
-
Max. Threshold: the output is enabled if the value of the selected variable is higher of the
programmed value.
-
Band: the output is enabled if the value of the selected variable is lower of the programmed
minimum value or higher of the programmed maximum value.
-
Always On: digital output is always enabled.
•
Measure Code , is the measure (see cap. 12) to associate at the digital output. To program the
digital output as pulse emission it’s necessary to select an energy variable.
•
Value , intervention threshold value (i.e., for overcoming 340V program 340.0, or 150kW program
150000,0) or pulse weight (i.e., if the active positive energy pulses must be emitted every 1 kWh
program 1.00) programmable from 0,01 to 100 kWh/pulse.
•
Time , is the threshold delay for intervention expressed in second (0-655 seconds) or duration time
of Pulse expressed in milliseconds (50-500 ms).
•
Hysteresis , it’s the percentage of alarm’s value under which the alarm come back in off condition:
it’s programmable from 0 to 99% (example: max threshold of active power at 150kW with 10%
hysteresis means the alarm come back in off condition when the active power will be 150-
15=135kW). It’s not available in Pulse mode.
•
InfValue and SupValue , low limit and high limit of alarm in band way.
Note: digital output management for P.F.-cos
Φ
.
In the P.F. and cos
Φ
the absolute minimum is considered the 0 capacitive and the absolute maximum
the 0 inductive.
To set an alarm when the cos
Φ
is less than e.g. 0.9 inductive (in the direction of 0 inductive) it’s
necessary to set MAX threshold mode. Instead of this, to set an alarm when cos
Φ
is more than e.g.
0.9 inductive (in the direction of 0 capacitive) it’s necessary to set MIN threshold mode. In BAND mode
there will be alarm when the cos
Φ
value will be extern to the set band (infvalue÷supvalue): the infvalue
must be the value nearest at the 0 capacitive.
Example:
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
CAP
IND
Min threshold
0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -1
1
CAP
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
IND
Max threshold
0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -1
1
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
CAP
IND
Band
0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -1
1
ON OFF