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4. EARTH FAULT ALARM – LOCAL INDICATION
For the "local indication" option to be used, the inverter's the Signal Relay (voltage-free relay) is configured to
switch when an inverter error is present, which is then used to operate a buzzer and/or light to indicate an earth
fault alarm.
4.1 Requirements
3 key components are needed for this option:
/
Inverter Signal Relay
/
External Alarm Device
/
Power Supply for the Alarm Device.
For the options shown in this document, an external power supply has not been used as it is assumed that the
power consumption of the Alarm Device to be relatively low. However, it is possible to integrate an external
power supply for devices that have high power requirements. For further information contact Technical Support.
4.2 Signal Relay Characteristics
The inverter's Signal Relay (floating switch contact), is shown as (7) in the figure below. It's a voltage-free relay
that can be programmed to operate a buzzer and/or light to indicate an earth fault alarm. It comes with an
orange mating connector.
Signal Relay specifications:
/
Max. AC 250 V AC / 4 A AC,
/
Max. DC 30 V DC / 1 A DC,
/
Max. 1.5 mm² (AWG 16) cable cross-section.
Signal Relay pin designation:
/
Pin 1 = NO contact (Normally Open),
/
Pin 2 = C (Common),
/
Pin 3 = NC contact (Normally Closed).
Figures below show Signal Relay's physical location in relation to inverter positioning.
(c) Fronius Australia Pty. Ltd, 2023
Figure 1: Fronius Inverter under Data communication cover
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