Relay outputs

Relay outputs are terminated on terminals labelled by a switch schematic sign and serve for switching two-state devices with alternating or current voltage. The COM terminal is common, serving as input for switching voltage. NO and NC terminals are used as the switching voltage output.

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

Unipi 1.1

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.

Warning:
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