English Module EM10
Changes due to technical improvements reserved
14 Module EM10 • 01/2008
b) Power-based control
This control is activated if pins 1 and 3 are bridged. See
fig. 2, pos. 5 and the wiring diagram on page 47. The
EM10 transfers the 0-10 V signal to a power setpoint.
This is a linear ratio, see table 2.
*) 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 is 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 starts heating continuously at low load from a setpoint
of 2 Volts.
Connecting several modules
It is possible to connect several different modules (e.g.
EM10 and VM10) to each other. To connect two or more
modules, the mains connection (fig. 4, pos. 2) and the EMS
connection (fig. 4, pos. 3) can always be interconnected.
Caution: This connection is polarity sensitive. The total
length of the EMS bus cable may be no more than 100 m.
Connecting the thermostat
z Connect the Logamatic RC thermostat to the EMS
connection (fig. 4, pos. 3).
Mains connection
z Connect the 230 V AC mains supply (fig. 2, pos. 1 and
fig. 4, pos. 1).
LED reports on the EM10 module (fig.1, pos.5)
Input
voltage
Power setpoint
(boiler)
Status
Boiler
0 V - 0.5 V 0 off
0.6 V ± 6% Low load *)
5.0 V ± 50% Partial load
10.0 V ± 100% Full load
table 2 Power-based control
fig. 4 Connect two modules with each other,
make mains connection.
2
3
3
12
LED status Meaning Procedure
green (permanent) Everything is connected properly.
green (flashing) No communication with the boiler for at
least 5 minutes.
Reset the boiler.
If the reset doen’t work, contact your installer.
See also the instructions for the boiler.
red (short period) The power is connected to the boiler.
red (constant) The EM10 is defective. Contact your installer. See also the instructions
for the boiler.
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