Bosch Thermotechnik EMS 2 Manual De Instalación página 30

30 | Installation
3.3 Electrical connection
▶ Observe current regulations applicable to power
connections, and use at least cable type H05 VV-...
3.3.1 Connecting the BUS connection and temperature
sensor (extra-low voltage side)
▶ If the conductor cross-sections are different, use the
junction box to connect the BUS nodes.
▶ Connect BUS nodes [B] via junction box [A] in star
( Fig. 13, page 197) or via BUS nodes with two BUS
connections in series.
If the maximum total length of the BUS
connections between all BUS nodes is exceeded,
or if the BUS system is realised as a ring structure,
the system cannot be commissioned.
Maximum total length of BUS connections:
2
• 100 m at 0.50 mm conductor cross-section
2
• 300 m at 1.50 mm conductor cross-section
▶ All low voltage leads must be routed separately from cables
carrying mains voltage to avoid inductive interference
(minimum separation 100 mm).
▶ In the case of external inductive interferences (e.g. from PV
systems), use shielded cables (e.g. LIYCY) and earth the
shield on one side. The shield should be connected to the
building's earth lead, e.g. to a free earth conductor terminal
or water pipe, and not to the earth lead in the module.
When sensor leads are extended, apply the following lead
cross-sections:
• up to 20 m with 0.75 mm
section
• 20 m up to 100 m with 1.50 mm
▶ Route cables through the grommets provided and connect
them as shown in the connection diagrams.
6 720 815 256 (2014/10)
2 2
to 1.50 mm conductor cross-
2
conductor cross-section
3.3.2 Connecting the power supply, pump and mixing
valve (mains voltage side)
The allocation of the electrical connections
depends on the system installed. The description
shown in Fig. 9 to Fig. 12, starting on page 196
onwards, is a possible suggestion for making the
electrical connections. Some of the steps are not
shown in black. This makes it easier to see which
steps belong together.
▶ Only use electrical cable of comparable quality.
▶ Ensure the power supply is connected to the correct
phases.
A power supply via an earthed safety plug is not
permissible.
▶ Only connect components and assemblies to the outputs in
accordance with these instructions. Do not connect any
additional control units, which control other system
components.
▶ Route cables through the grommets, connect them as
shown in the connection diagrams and secure them with
the strain relief pieces, which are supplied as part of the
scope of delivery ( Fig. 9 to 12, starting on page 196
onwards).
The maximum power consumption of the
connected components and assemblies must not
exceed the output stated in the module
specifications.
▶ If the mains voltage is not supplied via the
electronic system of the heat source, install a
standard all-pole isolator (in accordance with
EN 60335-1) on site to disconnect the mains
voltage.
3.3.3 Overview of the terminal assignment
This overview indicates which system parts can be connected.
The components identified with * (such as PS5, PS6 and PS9)
of the system are possible alternatives. Depending on the
module's use, one of the components is connected to the
"VS1/PS2/PS3" terminal.
Depending on what the module is used for (coding at the
module and configuration via the user interface), the system
components must be connected as indicated in the relevant
connection diagram ( chapter "Connection diagrams with
system schematics").
More complex solar systems can be created in combination
with a second solar module MS 200. Further terminal
assignments are possible in this case ( installation
instructions MS 200).
MS 100