mcr OMEGA pro
Power and Control Panel
„MERCOR” S.A. –
The company reserves the right to modify and amend this document without notice.
10/28
A flashing LED indicator signals a timeout has occured for monitoring inputs (e.g. limit switch signals). For
algorithm inputs (e.g. FAS signals, venting) the flashing LED signals the active algorithm.
The mrc MMS module controller identifies the specific input statuses with resistance measurement values.
The table below explains the difference between the make, break and continuity lost statuses.
Table 2. Input status according to the input resistance value.
Input status
Make
Break
Continuity lost
Input resistance
0
Ω
10 k
Ω
max. (
∞)Ω
Diagram
MMS
Signal contact closed Signal contact open
MMS input line
continuity lost
If an invalid input status exists, its respective LED will be flashing. The fault status will be memorized until
the ALARM RESET button is pressed on the Power and Control Panel front door. The memory functionality
maintains the control actuator fault data as required until the alarm is reset.
Relay outputs (OUT)
feature status readings on orange LED indicators. If a LED indicator is on, the
respective output is active. The output logic can be customized by rewiring the output terminals; each
SPDT relay output has three contact terminals.
Terminal 2 is the common (COM).
Terminal 1 is a normally closed (NC) contact, which is made with terminal 2 when the output is not active.
Terminal 3 is a normally open (NO) contact, which is made with terminal 2 when the output is active.
Output status
Not active
Active
LED
Schematic diagram,
relay inside
MMS module
An exemption to this operating principle is the FAULT output (indicates a Power and Control Panel failure)
which operates with a reverse logic and its LED is off when active. When testing the input signals with the
TEST button of the Power and Control Panel, the FAULT output indication will be flashing.
