Relay outputs

Unipi 1.1

The relay outputs are located on the terminals marked with the schematic mark of the switch, they are used to switch two-state devices and can switch AC or DC voltage. The COM terminal is typically common, the voltage is then at the NO or NC terminal, depending on the relay state.

NO - in the default state (no voltage), contacts are open
NC - in the default state (no voltage), contacts are closed

The state (On/Off) of each relay is indicated by a LED with a corresponding label. Overload and overvoltage protection should be provided externally by a circuit breaker (ideally one for each output). Nominal current and circuit breaker type should be selected according to the load and its characteristics concerning the maximum current on the output.

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Attention:
If an inductive load is connected (e.g., electric motors, relay coils, contactors, or even the cables in extensive electric installations), it is necessary to protect the relay outputs with a corresponding external element (e.g., varistor, RC circuit or a suitable diode).

If a capacitive load is connected (e.g., power sources of LED lights), it is necessary to protect the relay contacts against inrush current by connecting a corresponding thermistor to the relay's output.

Connection

The following image depicts the connection of ohmic (resistance)load with alternating voltage and connection of a three-way valve to Unipi 1.1 relay outputs:

Technical parameters

The data below represent a selection of the most important parameters and serve only as a quick reference. Detailed information can be found in the product datasheet provided by the relay manufacturer:
Finder 36.11.9.005.4011

Output type	Electromechanic non-shielded relay
Designation on the board	RELAYx (where x represents the relay number)
Number of terminals per relay	3
Terminal designation	Schematic (on the board)
Common terminal (COM)	Middle terminal
Closed without voltage (NC)	Terminal engaged according to scheme
Open without voltage (NO)	Terminal disengaged according to scheme
Contact/Output type	Switchable NO/NC (SPDT)
Number and type of relays	8 × Finder 36.11.9.005.4011
Switching voltage	250 V AC 30 V DC
Max. switching current (resistive load)	10 A
Mechanical lifetime	10 000 000
Electrical lifetime	Up to 50 000 (according to the connected load)
Switching time	10 ms / 5 ms
Designed for load character	Resistive
Load handling	External (RC, varistor, diode, thermistor)
Short circuit protection	No
Overvoltage protection	No
Galvanic isolation	Yes
Insulation voltage	4 000 V

Connection

This illustration depicts connection of ohmic (resistance) load with alternating voltage to Unipi 1.1 Lite relay output:

Technical parameters

The data below represent a selection of the most important parameters and serve only as a quick reference. Detailed information can be found in the product datasheet provided by the relay manufacturer:
Omron G5Q-14-EU

Output type	Electromechanic non-shielded relay
Designation on the board	RELAYx (where x represents the relay number)
Number of terminals per relay	3
Terminal designation	Schematic (on the board)
Common terminal (COM)	Middle terminal
Closed without voltage (NC)	Terminal engaged according to scheme
Open without voltage (NO)	Terminal disengaged according to scheme
Contact/Output type	Switchable NO/NC (SPDT)
Number and type of relays	6 × Omron G5Q-14-EU
Switching voltage	250 V AC 24 V DC
Max. switching current for VAC	10 A (NO) 3 A (NC)
Max. switching current for VDC	5 A (NO) 3 A (NC)
Mechanical lifetime	10 000 000
Electrical lifetime	Up to 100 000 (according to the connected load)
Switching speed	10 ms / 5 ms
Minimum time between closing and opening	200 ms
Designed for load character	Resistive
Load handling	External (RC, varistor, diode, thermistor)
Short circuit protection	No
Overvoltage protection	No
Galvanic isolation	Yes
Insulation voltage	4 000 V