Installation

Mounting

• (1) Main Mounting Hole: Mechanical mounting point only; no electrical connection.

• (2) Functional Earth (Ethernet): Electrical connection using a metal fastener. Required when a DCF receiver is used.

• (3) Standoffs: Support the PCB at multiple points to prevent flexing when cable terminals are accessed.

• (4) Function Earth (EMC / Chassis): Electrical connection to the local chassis ground using a metal fastener.

  • Class II Compliance: The product is designed as a Class II (double-insulated) device and does not rely on a protective earth connection for electrical safety.

  • Purpose: This connection is utilized purely as a Function Earth (FE) path for internal EMC suppression capacitors (Y-capacitors). Connecting it to an earthed chassis or enclosure does not affect the safety class of the device but is recommended for optimal electromagnetic compatibility.

Attention

The device must only be installed by a skilled person, such as a qualified electrician, who is familiar with the relevant regulations.

Warning

This equipment is not suitable for use in locations where children are likely to be present.

Note

The device must only be installed in a fire enclosure with protection against contact, dirt and water.

1

Disconnect all power sources - including the illumination switching input - before handling the PCB. Additionally, the NCC V2 VB may remain energized even after all external power sources are disconnected. After shutting down the device, wait at least one hour before handling it.

Interfaces and Variants

Three product variants are available, differing in feature set and interface availability. The following table summarizes these differences and the associated connections. Refer to the subsequent sections for detailed descriptions.

Label	Name	NCC V2	NCC V2 AC	NCC V2 VB
Ordering Information
-	Ordering Number	138422	138423	138424
-	Spring Terminal Included	✗	✓	✓
Power Supply
10	PoE / PoE+	✓	✓	✓
1	Mains	✗	✓	✓
-	Backup Supply	✗	✗	✓
Indicators / Controls
9	Reset Button	✓	✓	✓
A-D	Status LEDs	✓	✓	✓
Inputs and Outputs
10	Ethernet	✓	✓	✓
8	Clock Line	✓	✓	✓
5-6	Illumination	✓	✓	✓
7	Alarm Input	✗	✗	✓
2	LED Switching Input	✗	✓	✓
3, 4	DCF Input	✗	✗	✗
11	DCF Output	✗	✗	✗

Mains

Mains voltage connections are made using a 4-pole pluggable spring-clamp terminal block (WAGO 721 series). The LED switching input may be left unconnected if this function is not required. The maximum permissible conductor cross-section is 2.5 mm², and the insulation must be stripped to a length of 9-10 mm. All phase and neutral conductors shall be secured near the terminal block using cable ties.

Label	Connection Type	Nominal Voltage	Voltage Tolerance	Power Rating	Length	Description
1	Terminal Block	100-240 VAC 50 Hz	+/- 10%	30 W	N/A	Mains supply input that powers the device. Recommended Fuse: 3.15 A / slow-blow
2	Terminal Block	100-240 VAC 50 Hz	+/- 10%	0.5 W	N/A	Switching input that can turn the LED illumination on an off. Recommended Fuse: 315 mA / fast-acting

Warning

The external electrical installation must include an appropriate fuse and an all-pole mains switch for all mains connections.

Warning

Only use the original terminal block. We accept no responsibility for any damage to persons or property resulting from the use of plugs other than those provided, or from faulty or unsafe wiring.

Warning

Avoid stripping wires in a way that could lead to contact with other components. Make sure to attach strain reliefs to relieve the connection points of cables and lines from mechanical stress.

Attention

The power supply connection to the clock must be installed by a skilled person. National regulations must be followed.

Attention

Make sure all wires are disconnected from live voltage before handling them.

Warning

Power supply units may fail permanently if operated outside of the nominal voltage ratings.

Ethernet

The Ethernet connector (10) accepts standard Ethernet network cables. The device supports auto-negotiation for 10 Mbps and 100 Mbps operation, as well as Auto-MDIX.

Power over Ethernet (PoE and PoE+) is supported but not required, as the device can also be powered via an AC supply. When mains power is connected, PoE functionality is automatically disabled.

Label	Connection Type	Nominal Voltage	Voltage Tolerance	Power Rating	Length	Description
10	RJ45	0-57 V	+/- 10%	25.5 W	< 100 m	Ethernet connection with support for PoE or PoE+.

Warning

Power supply units may fail permanently if operated outside of the nominal voltage ratings.

Illumination Driver

The NCC V2 can drive LED illumination rings for single-sided and double-sided clocks. Two separate connectors (5, 6) are provided to simplify installation and servicing; both connectors are internally connected to the same LED driver.

Label	Connection Type	Voltage	Current	Length	Description
5, 6	Terminal Block	0-24 V	0-700 mA	< 1 m	LED Driver Outputs.

The maximum available illumination power depends on the selected power source. When powered via PoE only, the maximum brightness may be limited (≈ 10 W with PoE, ≈ 16 W with PoE+ or mains power).

Attention

Under open-circuit conditions (no load connected), the output voltage may rise to up to 57 V. To prevent damage to the LEDs, connect or disconnect the illumination only when the device is powered off.

Clock Line Driver

The NCC V2 clock line output (8) supplies power to, synchronizes, and monitors clock movements for both single-sided and double-sided clocks using MOBALine.

The connection is made using two conductors. Polarity is not relevant for operation; however, when two movements are connected and monitoring is required, one movement must be connected with reversed polarity.

Label	Connection Type	Voltage	Current	Length	Description
8	Terminal Block	20 V	0-100 mA	< 1 m	Clock Line Output.

Status LEDs

Device status is indicated by multiple LEDs.

Label	Name	Meaning
A	PoE+	PoE+ or AC power input is connected
B	Error	An error is active (e.g. short circuit on an output)
C	Sync	NCC V2 is synchronized
D	Power	NCC V2 is powered
E	Light	State of the illumination switching input (AC/VB only)

Reset Button

The reset button (9) allows the device to be rebooted or restored to factory settings. Press and hold the button for 5 seconds to reboot the device, or for 20 seconds to perform a factory reset.

Note

For security reasons, the factory reset function can be disabled in the device configuration.

Warning

Never press the reset button during configuration changes or a firmware update.

Alarm Input

The alarm input can be connected to a normally open, potential-free switching contact. This input may be used, for example, for vandalism detection.

Label	Connection Type	Voltage	Current	Length	Description
7	Terminal Block	20 V	0-2 mA	< 1 m	Alarm Input.

Backup Supply

The NCC V2 VB variant includes an internal energy storage unit. In the event of a power failure, this backup supply ensures that connected analog clock movements are driven to the 12 o’clock position.