Programmable Output Of The Lmu; Status Output; Alarm Output; Operational Status Signal - Siemens LMU54 Series Basic Documentation

Programmable output
of the LMU...

Status output

Alarm output

Operational status signal

Siemens Building Technologies
HVAC Products
Relay K2 is used as a programmable output of the LMU... Its function will be defined via
parameter «KonfigAusgang».
This parameter is on the «Installer» level and can also be accessed via the QAA73... .
With a number of hydraulic systems, output K2 is already assigned a basic function.
This can be the system pump, for example, the shutoff valve, or a DHW pump.
If output K2 is assigned one of the following functions using parameter «KonfigAusgang»,
the basic function will no longer be available at this output .
If required, the basic function of output K2 can be transferred to one of the outputs of the
clip-in function module.
Another alternative is offered by the hydraulic diagrams that include a diverting valve.
If the diverting valve is a stepper motor valve, the basic function of output K2 can be
transferred to the relay output (AC 230 V) for the diverting valve, which is not required in
that case.
For that purpose, parameter «K2aufUV» in «KonfigRg4» is to be set to «On».
It is always only one of the following functions that can be performed.
The following functions can be transferred to output K2 of the LMU... via parameter
«KonfigAusgang»:
• 0
Default (function according to the hydraulic diagram)
• 1
Status output
• 2
Alarm output
• 3
Operational signal
• 4
Switching off external transformer
• 5
Pump of the second heating circuit
• 6
DHW circulating pump
• 7
Actuating device with warm air curtain activated
• 8
Pump of the pressureless header (on / off for pump on the consumer side)
• 9
Basic function of controller clip-in module (system pump Q8 with plant diagrams
67, 70, 71 and 72)
• 10 Basic function K2 (like default, function according to the hydraulic diagram)
• 11 Actuating device with full DHW charging activated, in connection with
stratification storage tanks
• 12 Actuating device when analog signal (at the clip-in function module) has
exceeded the threshold
Control of an additional valve when using liquefied gas.
The status output is non-safety-related and is not supervised.
It is activated when the controller passes a command to the burner control.
If there is a lockout which does not allow the burner control to be started up, the status
output will be deactivated.
Exception: Lockout caused by open GP contact.
Output is set when there is a fault on the unit that calls for a manual lockout reset
(nonvolatile lockout).
Output is set when the burner is in operation.
Basic Documentation LMU54... / LMU64...
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CC1P7494en
07.11.2002