Communication Bus - Buderus Logamatic EM10 Manual Del Usuario

Module EM10

Communication bus

B Connect the EMS connection (
with a 2-core cable to the RC- (or
boiler (possibly parallel to the thermostat).
Caution: This connection is polarity sensitive. The total
length of the EMS bus cable may be no more than 100 m.
Malfunction signal
The fault signal will be activated as soon as:
– an interlocking fault occurs in the control unit,
– the system pressure is too low or
– and the communication with the control unit has been
interrupted for at least 5 minutes. See the wiring diagram
on page 46.
The EM10 generates two malfunction signals:
a) The AS 24 V connection (
free switching contact for low voltage signals of up to
24 V. This malfunction signal can for example, be
evaluated by a building management system.
AS 24 V no malfunction
1 and 2 interrupted
2 and 3 closed
b) The AS 230 V connection (
example operate a horn or warning light. In case of a
malfunction, there will be 230 VAC on this connection.
External control signal 0-10 V
The EM10 can be used as an interface between the control
unit and a building management system, for example.
With the 0-10 V DC signal (
temperature or the power of the boiler can be controlled
( fig. 3).
a) Flow temperature-based control
The EM10 transfers the 0-10 V signal to a flow
temperature-setpoint. This is a linear ratio,
Input
voltage
0 V - 0.5 V
0.6 V
5.0 V
10.0 V
Table 1 Flow temperature-based control
Module EM10 – 6 720 802 632 (2012/03)
fig. 2, [6]) of the EM10
-) connection on the
fig. 2, [4]), this is a potential-
malfunction
closed
interrupted
fig. 2, [3]), this can for
fig. 2, [5]), the flow
Flow temperature
Setpoint (boiler)
0
± 15 °C
± 50 °C
± 90 °C
Netz module
Fig. 2
1 230 V mains supply
2 230 V connection for a 2nd module
3 Alarm output 230 V
4 Alarm output 24 V
5 Control signal 0-10 V
6 Input EMS bus
7 Output EMS bus
tab. 1.
Status
Boiler
off
on
Fig. 3
on
on/maximum
AS 24V
N L
1
Netz module AS (230V)
1 2 3 4
Connections
External control voltage (V)
0-10 V diagram
English
U EMS EMS
2 3 2 1 3 1 2 1 2
5 6 7
13