16 – Monitoring T2S - ETH User Manual – v1.4
Hardware
6.2.1 Alarm relay
There are 3 alarm contacts:
• Major
• Minor
• User selectable
As one can see in the picture: contacts 5 and 6 are closed when no major alarm is present,
contact 8 and 9 are closed when no minor alarm is present.
Remark: Default mapping and level of each available alarm of the monitoring unit is
available in “Annex 1: Supervisor alarms - T2S ETH”, page 69.
NB: Alarm relay are active (energized) when no alarm are present.
• Alarms relay features
Max current: 2 A @ 30 VDC or 1A @ 60 VDC
Max Power: 60 W
Max Voltage: 60 VDC SELV
Note that for higher voltages, it is mandatory to install an additional relay with appropriate characteristics – especially
for 60/110/220 VDC.
6.2.2 Digital Inputs
Two potential free Digital inputs are available for customer connections.
• Digital Input 1 is assigned for MBP operation if used.
• Digital Input 2 is assigned for Surge Arrester if used.
The voltage present on terminal 1 and 3 is +5 V (galvanic insulation). Care should be taken to avoid connecting any
external voltage on terminal 1 to 3. External signals should be applied to these terminals via Volt-free contacts. The
function is activated when the 2 terminals concerned are short-circuited (i.e. when the external Volt-free contact is
closed).
6.2.3 Communication
A RJ45 connector is present at rear of the shelf and can be used for Candis display and Modbus (RTU) communication.
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