Power supply unit

Description

The power supply module provides an input voltage of 26 Vdc to the bus, the modules and the controls of the installation. Several power supply modules can be connected in parallel in one single installation.

Overview 

Sizing

Rule of thumb

The following rule of thumb can be applied to calculate the number of power supplies required: a maximum of 24 modules inside the electrical cabinet and a maximum of 70 controls (of which 20 with status LED) per power supply. Depending on the size and layout of your installation, you will need to install one, two or three power supplies.

This rule of thumb leaves a considerable margin for error.

Exact calculation

Each control and module consumes a specific amount of energy. This consumption is expressed in points. One power supply is needed for every 800 points. Add the points of all the controls and modules of your installation and divide this sum by 800 to determine the number of power supplies required. A maximum of three power supplies can be used per installation.

Calculate the exact number of power supplies required based on the table below.

Installation

Connection  diagram

Each power supply has a capacity of 10 W. Determine the exact number of power supplies required prior to commencing the installation process. See Sizing .

Follow the steps below to connect and mount a power supply module:

• Observe the guidelines with regard to the layout of the electrical cabinet while mounting and connecting the power supply. See Installation preparations .
• Ensure that the installation is disconnected from the mains while mounting and connecting the power supply.

1    Mount the power supply module onto a DIN rail in the bottom left of the electrical cabinet.

2    Mount the other modules onto the rail, from left to right. Start with the controller.

When there is no room left on the rail or the maximum number of 12 modules per rail has been reached, you simply continue on the rail above.

A power supply or a rail coupler must be used at the left beginning of every DIN rail.

3    Connect all four connection terminals (+, –, B1, B2) to the corresponding connection terminals of the rail coupler or the power supply on the previous and next rails.

4    Each module is fitted with a sliding contact. Slide the sliding contact to the right until it clicks into the next module. This will ensure that the bus and the power supply are connected.

5    Connect the L phase wire and the N neutral conductor to the L and N screw terminals respectively.

Selecting a master power supply module

When several power supply modules are used in a single electrical installation, you can manually select one of these modules to act as the master power supply. The remaining power supply modules will then act as slaves. One of the power supply modules will automatically be selected as the master if no manual selection is made.

The power supply supplies voltage to the bus, the modules and the controls. The slaves supply voltage to the modules but not to the bus. The maximum permitted cable length between the master power supply and the control points must be observed. See Installation preparations . Should the master power supply module become defective, then one of the slaves will automatically be selected as the new master. This may cause certain functions to become inoperable.

Follow the steps below to manually select a master power supply module:

1    Connect the installation to the mains power supply.

2    Locate the MASTER address button on the module that you wish to select as the master power supply module and press and hold for two seconds.

Several power supply modules may have been used across more than one electrical cabinet. Select the module with the most central location as the master power supply module.

These settings will be stored and will remain unaffected when the installation is disconnected from the mains.

Error codes

When the module is functioning properly, the STATUS LED will light up in TEST mode only. If one or several errors occur, the LED will blink to indicate the error code of the error with the highest priority. The table below provides an overview of all error codes.

Press the TEST button on the controller to activate TEST mode.

Technical data

• available power: 10 W
• input voltage: 230 Vac ± 10%
• output: 26 Vdc, 400 mA (SELV; safety extra-low voltage) - 10 W
• dimensions: DIN 4U
• sliding contact
• 4 connection terminals
• CE marking
• ambient temperature: 0 - 45°C
• short circuit, over-voltage, faulty connection and overheating protection