EFR4001IP
12720-0713-00
Page
16 / 53
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7.5 Program 1 (the largest of up to 3 consumers is switched on)
Precondition:
•
Own generating unit, e.g. photovoltaic, CHP, wind rotor, water turbine,
…
•
1…3 switchable consumers, same / 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),
e.g. heating element
•
1 and / or 3-phase consumers
Goal:
•
The highest possible internal consumption by switching on of the largest-possible consumer / load
•
Taking into account the analogue consumed power, it is possible to switch on a relay if the relay is
switched on and the controlled consumer is reduced (relays have priority)
Measurement:
•
The EFR4001IP monitors the accumulated flow of energy at the grid connection point
(between the public power grid and the consumers / generators)
Feature:
•
Both the consumers that are already switched on, and the analogue controlled consumers are taken
into account (which is why the typical power consumption of the consumers has to be set)
Connection:
•
If the grid-infeed increases or the delivery (=import= draw) falls under the limit-ON value, which has
been set for the load or 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 so that
the next largest consumer could be switched on, the smaller consumer will be switched off and the
larger one switched on after the expiration of the set delay-ON time and the minimum start-up time.
•
All consumers are switched on in the same way.
•
In order that the largest possible consumer is switched on firstly, if sufficient power is available, it
should be given the shortest delay-ON time (smallest = longest).
Disconnection:
•
If the grid-infeed decreases or the delivery (=import= draw) rises above the limit-OFF value, which has
been set for the load or the consumer, then the set delay-OFF time for the load starts to count.
If the limit-OFF value remains undercut for the entire delay-OFF time, the consumer is switched off
after the minimum-on time has expired.
•
When switching back to the next lower level, the delay-ON time does not run down again, which
results that the excess energy is being efficiently used.
Application Examples:
•
3 heating elements with different power, only one of them is allowed to be switched on at one time.
•
Electric heating with 3 heating levels, only one of them is allowed to be switched on at the same time.
