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3.3
electrical connection
▶ Observe electrical regulations and use at least cable H05 VV-...
3.3.1
Establishing the BUS connection and temperature sensor
(extra-low voltage side)
General BUS connection
If the maximum cable length of the BUS connection between all BUS
nodes is exceeded, or if the a ring structure exists in the BUS system,
the system cannot be commissioned.
Maximum total length of BUS connections:
2
• 100 m with 0.50 mm
conductor cross-section
2
• 300 m with 1.50 mm
conductor cross-section
BUS connection between the heat source and cascade module
▶ Connect heat sources and lower level cascade modules directly to
terminals BUS1 ... BUS4 ( Chapter 3.3.4 "Overview of the
terminal assignment").
BUS connection between the cascade module, control unit and
other modules
▶ If the conductor cross-sections vary, use a junction box to connect
the BUS nodes.
▶ BUS node [B] via junction box [A] in a star ( Fig. 79 at end of
document, observe instructions for the control unit and other modules).
Temperature sensor
When extending the sensor leads, use the following conductor
cross-sections:
2
2
• 0.75 mm
to 1.50 mm
conductor cross-section for up to 20 m
2
• 1.50 mm
conductor cross-section for 20 m to 100 m
General information on the extra-low voltage side
Terminal designations (extra-low voltage side ≤ 24 V)
1)
0-10 V
Connection
for 0-10 V room temperature-dependent controller
or building management system with a 0-10 V controller output, or
in addition for performance feedback as a 0-10 V signal to terminal
3 for a building management system
2)
BUS
Connection to controller, modules
BUS1...4
Connection to heat sources or lower level cascade modules
I2, I3
Connection to external switch (Input)
3)
OC1
Connection
Pump speed control with 0-10 V signal
(Output Cascade)
T0, T1, T2 Connection of temperature sensor (Temperature sensor)
1) Terminal assignment: 1 – earth; 2 – 0-10 V input for heat demand from the
building management system; 3 – 0-10 V output (optional) for feedback
2) In a few devices, the terminal for the BUS system is labelled with EMS.
3) Terminal assignment: 1 – earth; 2 – output; 3 – input (optional)
Table 4
▶ If PO is used to control, do not bridge IA1. If IA1 is bridged and PO is
open, the maximum set flow temperature is controlled.
▶ To avoid inductive interference: Make sure all low-voltage cables are
routed separately from supply voltage carrying cables
(min. clearance 100 mm).
▶ In the case of external inductive effects (e. g. from PV systems) use
shielded cable (e. g. LiYCY) and ground one end of the shield.
|Connect the shield to the building's earthing system, e.g. to a free
earth conductor terminal or water pipes, and not to the terminal for
earth leads in the module.
▶ Route cables through the grommets provided and connect them as
shown in the connection diagrams.
MC 400 – 6720890243 (2018/12)
3.3.2
Connecting the power supply, pump and mixer
(mains voltage side)
Terminal designations (mains voltage side)
120/230 V AC
Mains voltage connection
PC0, PC1
Connection to pump (Pump Cascade)
1)
A0
Connection for fault display (Alert)
So that a false alarm is prevented, a fault in the system
must be uninterrupted for at least 10 minutes.
IA1
230 V On/Off controller connection
1) Fault contact (NO = normally open contact to C, NC = normally closed contact to
C).
The fault contact is activated in the event of interlocking and blocking faults.
Table 5
The assignment of the electrical connection depends on which system is
installed. The description at the end of the document in Fig. 72 to 79 is
a possible suggestion for the electrical connection. The steps are shown
partly in different colours. This makes it easier to see, which steps
belong together.
▶ Only use electric cables of the same quality.
▶ Make sure the power supply is connected to the correct phases.
A power supply via an earthed safety plug is not permissible.
▶ Connect only components and assemblies to the outputs as
described in these instructions. Do not connect any additional
controls that operate other system components.
The maximum power consumption of the connected components and
assemblies must not exceed the power output stated in the
specifications for the module.
▶ 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 interrupt the mains voltage.
▶ Route cables through the grommets, connect them as shown in the
connection diagrams and secure them with the strain relief devices
included in the scope of delivery ( Fig. 71 to 78 at the end of this
document).
3.3.3
Connection diagrams with system schematics
The hydraulic diagrams are only schematic in nature and are non-binding
suggestions for a hydraulic layout. The safety equipment must be
implemented in accordance with the applicable standards and local
regulations. For further information and options, refer to the technical
guides or tender specification.
Installation
19
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