Fronius Ohmpilot Operating Instructions Manual page 98

(1)
Short circuit
If current-carrying stripped wires touch each other, a short circuit is triggered.
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(2)
(3)
(4)
(5)
(6)
NOTE!
Relay contacts can oxidise.
The voltage must be at least 15 V and the current at least 2 mA, so that the relay
contacts do not oxidise.
(7)
(8)
(9)
(10)
The Fronius Smart Meter records the current power at the feed-in point and
transfers the data to the inverter. By controlling the Ohmpilot, the inverter adjus-
ts any surplus energy that is available to zero. In detail, this takes place by conti-
nuously adjusting the heating element connected to the Ohmpilot and by targe-
ted switching on of the heat pump.
For activation, the heat pump must have a control input (e.g. SG Ready or grid
operator release). For example, the heat pump can be switched from operating
state 2 (normal operation) to operating state 3 (increased operation) as a result of
activation of heat pump input 2 by the relay. The heat pump can also be switched
from operating state 1 (blocked time set by grid operator) to operating state 2
(normal operation) as a result of activation of heat pump input 1 by the relay.
A description and list of SG Ready heat pumps can be found at:
www.waermepumpe.de/normen-technik/sg-ready/sg-ready-datenbank/
Relatively small surpluses are consumed by the heating element in a continuous-
ly variable manner. From a certain excess power, it makes sense to activate the
heat pump, as it has a higher efficiency. The average COP (coefficient of perfor-
mance) for water heating up to 53 °C is 2.5. Thus, with 1 KW of electrical energy,
2.5 KW of thermal energy can be generated.
The optimal switching thresholds depend on:
98
INPUT - grid supply 1x 230 V network, spring-loaded terminal 1.5 - 2.5
mm²
WARNING!
Carry out all connection work in accordance with the applicable electrotech-
nical guidelines and regulations.
Observe the maximum stripping length of 10 mm.
When connecting the phases, tie together the individual wires with a cable tie
directly in front of the terminal.
Multifunctional relay output
OUTPUT up to 3 kW variable, max. 13 A resistive load, spring-loaded ter-
minal 1.5 - 2.5 mm²
Hot water boiler
Temperature sensor PT1000
Heat pump with SG Ready control input
Heating element (max. 3 kW)
Residual-current circuit breaker
Automatic circuit breaker max. B16A
Ferrite (included in scope of supply)
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