Buderus EM10 für UBA 3 Serviceanleitung Seite 10

English
0 – 10V external control signal
The EM 10 can be used as the interface between the boiler
assembly and a building management system for example.
A 0-10 VDC signal can be used to enable power-based or
flow temperature-based control (fig. 3).
Flow temperature-based control
The EM 10 transfers the 0-10V signal from the building
management system to a flow temperature set point.
This is a linear ratio (table 1).
Input voltage Flow temperature set point
[V]
0
0.5
0.6
5.0
10.0
Table 1 Flow temperature-based control
Power-based control
The EM 10 transfers the signal from the building manage-
ment system to a power set point.
This is a linear ratio (table 2).
Input voltage
[V]
0
0.5
0.6
5.0
10.0
Table 2 Power-based control
*)The low-load power depends on the type of appliance. For
example, if the low load of the appliance is 20% and the control
signal 1 volt (= 10%), the target power is lower than the low load.
In this case the appliance delivers 10% using an on/off cycle
with low load operation. In this example the boiler assembly
starts heating continuously from a set point of 2 volts.
To activate the power regulation the EM10 connectors
must be bridged. See the "EM 10 connection diagram"
on page 19.
Subject to changes due to technical improvements!
10
(boiler) [°C]
0
0
± 15
± 50
± 90
Power set point
(boiler) [%]
0
0
± 6
± 50
100
Boiler
condition
off
Fig. 3 0 – 10V Diagram
off
on
on
on / maximum
Boiler
condition
off
off
low load *)
partial load
full load
Module EM10
external control voltage
Module EM10 • 06/2005