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Building Technologies Division
Warning!
If, with the safety-related GP configuration (9612), function Gas pressure
switch is selected, Function input H6 (6008) only allows the selection of None.
Function input H6 (6008) is evaluated only when the safety-related GP
configuration (9612) is set to GP not connected.
The safety-related GP configuration (9612)) parameter must be set to GP not
connected in order for Function input H6 (6008) to be evaluated.
In that case, function Gas pressure switch is active as a non-safety-related
function because it can be activated and deactivated from a non-safety-related
operating section.
Also refer to chapters Configuration and Program sequence of burner control
(function).
Flow measurement Hz (frequency measurement)
Here, a flow sensor can be connected, which indicates the flow rate in the form of a
frequency value.
Consumer request VKx 10V
The heat source receives a voltage signal (DC 0...10 V) as the preselected output. A
linear characteristic converts the applied voltage to a heat request. This linear
characteristic is defined with the help of 2 fixed points (voltage value 1/function value 1,
and voltage value 2/function value 2).
The function value's resolution is 0.1 °C. This means that the function value to be
parameterized for a setpoint of 80 °C, for example, is 800.
The request becomes active when – via the characteristic – the applied voltage leads to
a flow temperature setpoint of at least 6 °C. The request for heat remains active as long
as the applied voltage demands a flow temperature setpoint of at least 4 °C.
The flow temperature setpoint is limited to the boiler's maximum setpoint (Setpoint max
(2212)). In addition, the flow temperature setpoint is limited to the limit thermostat's
Cutout temp LT (2531) – minimum switch-off differential in Heating mode (Switching diff
off min HCs (2455)) –3 K.
Pressure measurement DC 10 V
The voltage signal present at input Hx is converted to a pressure value (linear
conversion). The linear characteristic is defined by 2 fixed points (voltage value
1/function value 1, and voltage value 2/function value 2).
Output request 10V
The heat source receives a voltage signal (DC 0...10 V) as a heat request. A linear
characteristic converts the applied voltage to an output request. This characteristic is
defined with the help of 2 fixed points (voltage value 1/function value 1, and voltage
value 2/function value 2).
The function value's resolution is 0.1%. This means that the function value to be
parameterized for an output request of 50%, for example, is 500.
The request becomes active when the applied voltage is a minimum of 200 mV. It
remains active as long as the voltage at input H is a minimum of 150 mV.
The switch-off point for the burner lies 3 K below the limit thermostat's Cutout temp LT
(2531). The burner's switch-on point lies by the switch-on differential in Heating mode
(Switching diff on HCs (2454)) below the switch-off point. There is no valid Boiler
setpoint (8311).
Note!
In the case of an externally preselected output, forced signals are sent to the
consumers. As a result, the setpoints of all heating circuits (pump and mixing circuits)
are set to their maximum.
User Manual LMS14...
6 The settings in detail
CC1U7471en
28.01.2015
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