Nittan Evolution Triple Input/Output Module

FAQs

What is the EV-3IO used for?

The EV-3IO is a triple input/output module used in Nittan Evolution analogue addressable fire alarm systems. It provides three supervised inputs for monitoring various contacts and devices, and three relay outputs for controlling equipment such as dampers, extractors, ventilation systems, smoke control systems, and shutdown of plants or facilities.

What is the short circuit isolator (SCI) function?

The EV-3IO has a built-in -ve line short circuit isolator that protects the entire loop from failure if a short circuit occurs between L+ and L- on the loop. When a short is detected, the section containing the fault is automatically isolated while the device continues communication from the opposite side. The isolator self-resets when the fault clears. The SCI can be bypassed using a jumper if required.

What is failsafe mode and how is it configured?

Failsafe mode is a setting for the AC relay output (5A @ 240Vac) controlled by DIP switch 1. In failsafe mode (DIP switch 1 ON), the relay activates when loop power is off, ensuring fail-safe operation for critical applications like door release. In normal mode (DIP switch 1 OFF), the relay remains off when loop power is lost.

Can inputs be configured as normally closed?

Yes, Input circuit 1 can be configured as normally closed using DIP switch 2. When DIP switch 2 is ON, Input 1 is set to normally closed. When OFF, Input 1 is normally open. Input circuits 2 and 3 are always normally open regardless of DIP switch settings.

How is the module addressed?

The EV-3IO is addressed using the EV-AD2-EXT handheld programmer connected via Micro USB cable to the address setting port. The address can be set to any value from 1-254 (depending on panel model) and can be programmed with loop power on or off, even after the module is connected to the loop. The factory default address is 1.

What are the relay output ratings?

The EV-3IO provides three relay outputs: Relay 1 and Relay 2 are rated at 1A at 30Vdc. The AC relay is rated at 5A at 240Vac or alternatively 5A at 30Vdc for DC applications.

What do the LED indicators show?

The module has five LEDs: Polling LED (green) flashes during polling from the control panel; Input LED (red) illuminates when an input is activated; Output LED (red) illuminates when output relay is on; Fault LED (yellow) indicates open/short circuit in input or relay stuck fault; SCI LED (yellow) illuminates when short circuit isolator is activated.

What resistors are required for the inputs?

Each input circuit requires a 10k ohm end-of-line (EOL) resistor and a 470 ohm or 680 ohm alarm resistor for fault and alarm monitoring. The module is supplied with 3x 10k ohm EOL resistors and 3x 680 ohm alarm resistors.

What are the input threshold levels?

The input threshold levels are: ON (input activated) = < 680 ohm; Short circuit = < 50 ohm; Open circuit = > 20k ohm. This allows the system to distinguish between normal, alarm, short circuit, and open circuit conditions.

Can the EV-3IO be used with MxPro4 panels?

No, the EV-3IO is not compatible with Advanced MxPro4 (Mx4000) panels. It is designed exclusively for use with Nittan Evolution protocol systems. For MxPro4 compatibility, a non-SCI model would be required.

Can -ve and +ve isolator styles be mixed?

No, it is not possible to mix -ve and older +ve isolator styles on the same system. All isolators on a loop must be of the same type.

What is the maximum loop resistance?

The maximum loop resistance is < 50 ohm/km for both the main loop and input line resistance, ensuring reliable communication over extended cable runs.

How should the module be maintained?

Inspection and testing of the module should be carried out periodically according to the requirements of BS 5839 Part 1 (Fire Detection and Alarm Systems for Buildings: Code of Practice for System Design, Installation and Servicing). When conducting site testing, ensure the Fire Alarm Control Panel is set to test mode and take necessary precautions to limit activation of alarm sounders/bells and fire service summoning devices.