EFR4001IP
12720-0713-00
Page
17 / 53
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7.6 Program 2 (up to 3 consumers are switched on in succession)
Precondition:
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Own generating unit, e.g. photovoltaic, CHP, wind rotor, water turbine, …
•
1 up to 3 switchable consumers, same or different power, e.g. heating element, heat pump,
rechargeable batteries, electric car, electric heating, air conditioning, ...
•
Max. 1 controllable consumer with linear phase-angle or trailing-edge control 0/4 to 20 mA (0-10V)
•
1 and / or 3-phase consumers
Goal:
•
The highest possible internal consumption by gradually switching on of the consumers or loads, at the
same time. The previously switched on consumers are still switched on.
•
If it is possible to switch on a relay in consideration of the analogue consumed power, the relay would
turn on and the analogue controlled consumer is going to switch off. (Priority in relays)
Measurement:
•
The EFR4001IP monitors the amount flow of energy at the grid connection point
(between the public power grid and the consumers / generators)
Feature:
•
Analogue regulated consumers are taken into account
•
Previously switched-on consumers are not taken into account, the actual measured value P L123 is
evaluated
Connection:
•
If the grid-infeed increases or the delivery (=import= draw) falls under the limit-ON value, which has
been set for the consumer, then the set delay-ON time for the load starts to count.
If the limit-ON value remains undercut for the entire delay-ON time, the consumer is switched on and
the set minimum-on time begins to count.
•
If the grid-infeed carries on to increase or the delivery (=import= draw) continues to fall below the set
limit, the next largest consumer will be switched on after the expiration of the set delay-ON time.
•
All consumers are switched on in the same way.
•
The sequence is determined by the set limit values and by the set delay-ON times.
Disconnection:
•
If the infeed decreases or the delivery (=import= draw) increases over the limit-OFF value, which has
been set for the load or the consumer, then the set delay-OFF time starts to count.
If the limit-OFF value remains exceeded for the entire delay-OFF time, the consumer is switched off
after the expiration of the minimum start-up time.
•
All consumers are switched off in the same way.
•
So that the smallest consumer is switched off firstly, it should be given the shortest delay-OFF time
(largest = longest).
Example:
•
Electric heating with 3 heat levels, all 3 can be operated at the same time but the sequence (low,
medium, high) must be correct.