Nittan Evolution Mini Input Module

FAQs

What is the purpose of the EV-Mini IP2?

The EV-Mini IP2 is a single input interface module that allows normally open dry contact devices (such as manual call points, beam smoke detectors, aspirating smoke detectors, door monitoring switches, or other fire safety equipment) to be connected to Nittan Evolution analogue addressable fire alarm systems. The module monitors the input circuit and reports the device status to the control panel, enabling integration of non-addressable equipment into addressable fire alarm systems. This is essential for interfacing third-party equipment or conventional devices with modern addressable fire panels.

What does the integral short circuit isolator do?

The integral -ve line short circuit isolator is a critical safety feature that prevents a short circuit on one section of the loop from disabling the entire fire alarm system. If a short circuit occurs between L+ and L- (such as from damaged cable or water ingress), the isolator automatically disconnects the affected section of wiring. This allows devices on the opposite side of the fault to continue communicating with the control panel, maintaining partial system operation. A yellow LED on the module illuminates when the isolator is active, providing visual indication of the fault location. The isolator automatically resets once the short circuit is cleared.

How is the module address set?

The EV-Mini IP2 address is set using the Nittan EV-AD2-EXT handheld programmer. Connect the programmer to the module’s address setting port using a Micro USB cable, then use the programmer’s interface to change the address from the factory default of 1 to any address between 1-254 (depending on the control panel model’s capacity). Address setting can be performed with or without power applied to the module and even after the module has been connected to the loop. This flexibility simplifies commissioning and allows address changes without system disruption.

What resistor values are required for operation?

The EV-Mini IP2 requires two resistors for proper operation. A 10k ohm end-of-line (EOL) resistor is installed at the end of the input circuit to provide supervision and detect open circuits. When an alarm condition occurs (the monitored contact closes), a 470 or 680 ohm alarm resistor is connected across the input, signaling the alarm to the control panel. Both resistors are typically supplied with the module. The input circuit monitoring detects: alarm condition (less than 680 ohms), short circuit (less than 50 ohms), normal condition (10k ohm EOL present), and open circuit (greater than 20k ohms).

Can the EV-Mini IP2 be installed inside other equipment?

Yes, the EV-Mini IP2’s compact design (60.5mm x 48mm x 33mm) specifically allows installation within other fire detection equipment. It can be mounted inside aspirating smoke detector housings, beam-type smoke detector units, or integrated into manual call points. For installation inside UK 1-gang back boxes (minimum 35mm depth), use the mounting tabs provided. When installing inside aspirating or beam detectors, the mounting tabs can be removed to create an even more compact footprint. This integration capability simplifies installations by reducing the number of visible modules and enclosures required.

What is the remote LED output for?

The EV-Mini IP2 provides a constant current output (2.5mA typical) specifically designed to drive remote LED indicators such as the Nittan STA-R1. This allows installation of a visual indicator at a location separate from the module itself. For example, if the EV-Mini IP2 is mounted inside an aspirating smoke detector cabinet in a ceiling void, a remote LED indicator can be installed in a visible location to show when that input is in alarm. This provides valuable visual feedback for system status and alarm location identification without requiring access to the concealed module.

Is the EV-Mini IP2 compatible with all Nittan control panels?

The EV-Mini IP2 is compatible with Nittan Evolution analogue addressable fire alarm control panels. However, it is specifically NOT compatible with the Advanced MxPro4 (Mx4000) panel – for that panel, the Non-SCI model must be used instead. Before installation, verify compatibility with your specific control panel model. Additionally, note that it is not possible to mix +ve and -ve isolator styles on the same system, so ensure all isolators in your installation use the same polarity configuration as specified by the system design.

How do you install the module in a 1-gang back box?

To install the EV-Mini IP2 in a standard UK 1-gang back box (minimum 35mm depth), secure the module using the mounting tabs and appropriate screws. The compact dimensions allow it to fit comfortably within the back box along with the required wiring. Connect the loop wiring (from the panel or previous device, and to the next device) to the L+/L- terminals. Connect the input device wiring to the In+/In- terminals with the 10k ohm EOL resistor and alarm resistor (470 or 680 ohm) as shown in the wiring diagram. If using a remote LED indicator, connect it to the A+/A- terminals. Ensure all wiring conforms to BS5839 Part 1 and IEE wiring regulations.

What maintenance is required?

Inspection and testing of the EV-Mini IP2 should be carried out periodically according to BS 5839 Part 1 requirements or equivalent local codes of practice. For routine inspection, ensure the module is secure and undamaged, verify all wiring connections are tight, and check that the module responds correctly during system testing. When carrying out site testing, set the fire alarm control panel to test mode to prevent unwanted activation of alarm sounders and fire service summoning equipment. The module should be tested by activating the connected input device and verifying that the alarm is correctly reported at the control panel and that any remote LED indicator operates as expected.

What causes the yellow LED to illuminate?

The yellow LED on the EV-Mini IP2 illuminates when the short circuit isolator (SCI) is active. This occurs when the isolator detects a short circuit between L+ and L- on the loop wiring. The SCI automatically isolates the section of loop containing the short circuit, preventing the fault from disabling the entire system. The yellow LED provides immediate visual indication that the isolator has activated and helps technicians quickly locate which isolator has operated during fault-finding. Once the short circuit is cleared (by repairing the damaged cable or removing the fault condition), the isolator will automatically reset and the yellow LED will extinguish.