Netzvorrangschaltung

For automatic switching between "shore power" and "inverter power" .

Description:

The mains priority circuit ensures the reliable separation of two input voltage sources (e.g. shore power mains and inverter) and always switches only one input source through to the consumer output. The mains switching automatically detects when an input voltage is present at the master input and switches it through to the consumer output with priority. If an input voltage is also present at the slave input, it is not used until the voltage is no longer present at the master input (e.g. due to a mains failure), the slave input is switched through to the consumer output. The consumers continue to be supplied almost without interruption. When the voltage at the master input is available again, it is switched through to the consumer output. The mains priority circuit ensures that the different voltage sources cannot collide; only one input source is switched through to the consumer output at a time.

This circuit is essential if, for example, an inverter is installed in a motorhome and this is to supply the existing 230V sockets in the motorhome. Without a mains priority circuit, this will lead to the certain death of the inverter as soon as the shore power is connected to the motorhome's external socket.

The switching time between the voltage sources takes place within 20 milliseconds, which makes it possible to use the mains switchover in conjunction with an inverter as a virtually uninterruptible power supply (UPS).

It is possible to determine which voltage source is connected to the master and which to the slave. This means that the inverter can also be switched to master and only if it is not available is the slave voltage source (generator or public grid) switched through.

Connection variants:
Public grid / shore power has priority (master), inverter (slave).
- The 230V shore power is connected to the master input (higher priority) in the mains priority circuit.
- The inverter is connected to the slave input in the mains priority circuit.
- The shore power is switched through to the consumers directly (prioritised) as soon as it is available.
- The inverter does not supply the loads as long as shore power is available, the inverter is protected against external voltage.
- Only if the shore power fails, the inverter (slave input) is automatically switched over, which then continues to supply the consumers with power (either from an inverter or generator, but only if these voltage sources are active / switched on).
- when the master input is available again, the automatic switch back to this source takes place.
- this is the typical circuit in motorhomes and boats and in backup systems (heating control)

Inverter has priority (master), public grid / generator (slave).
- the inverter / generator is connected to the master input (higher priority).
- the 230V shore power grid is connected to the slave input in the grid priority circuit.
- The current is primarily taken from the inverter (batteries) (this circuit is used in solar island systems, for example).
- if the inverter switches off due to deep discharge protection or for any other reason, the system automatically switches to the slave voltage source (shore power). It is mandatory to have a deep discharge protection to protect the batteries from too deep discharge. When the master input is available again, the system automatically switches back to this source.

Please note that according to the manufacturer's specifications, the input voltage at the master input should be a pure sine wave voltage.

Scope of delivery:

Mains priority circuit ATS16
Of course, you will also receive an instruction manual in German from us.

General information:

Rated current: 16A
Power: 3.680W
Switching current: 16A
Switching time: 20ms
Self-consumption idle state: 21mA
Self-consumption switched state: 35mA
Fuses: 3 x 25A fast
Connection terminals: max. 6mm²

Master input:

Input voltage range: 190-240V AC
Input voltage frequency: 50Hz

Slave input:

Input voltage range: 0-240V AC
Input voltage frequency: 50Hz

Switching threshold of input voltage Master

Switching to slave: <180V AC
Switching to master: >185V AC

Housing:

Housing material: ABS
IP protection class: IP65
Strain relief: 3 x PG13.5 gland, clamping range 6-12mm, tightening torque: 4Nm
Tightening torque cable terminals: 0.6-0.8Nm
Dimensions: 125 x 125 x 80mm
Weight: 425g

Approvals: CE

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Product safety information:
Brand: Fraron
Manufacturer: FraRon electronic GmbH, Industriestr. 2a, 63825 Schöllkrippen, kontakt@fraron.de
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