3. Power supply
17
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 on page 14
.
Follow the steps below to connect and mount a power supply module:
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.
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 on page 6
. 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.
• Observe the guidelines with regard to the layout of the electrical cabinet while mounting and connecting the
power supply. See
Installation preparations on page 6
.
• Ensure that the installation is disconnected from the mains while mounting and connecting the power
supply.
A power supply or a rail coupler must be used at the left beginning of every DIN rail.
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.
