MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM047 Rev 13 05/03/30
19
Thomson Technology
3.2.2.4.
RUN
This LED is illuminated whenever the MEC 20 has called the engine to
run.
3.2.2.5.
COMMON FAIL
This LED is illuminated whenever the MEC 20 has initiated a common fail
signal (i.e. whenever an alarm or shutdown fault has been activated).
Note:
All LED’s will be illuminated whenever a lamp test function is
performed.
3.2.3. CONTRAST ADJUSTMENT (R115)
A contrast adjustment potentiometer is located on the rear of the PCB and is
factory set for ambient temperatures of 15
°
to 30
°
Celsius. For different ambient
temperatures, consult the factory for adjustment procedures.
3.2.4. COMMUNICATION PORTS
Two RJ45 communication ports are provided on the circuit board for optional
features as follows:
3.2.4.1 J6 - EXP This port is utilized to interconnect an external expansion
module for additional output contacts and/or the EAP 110 remote
annunciator. Refer to
Section 7.0 & 8.0
for additional information.
3.2.4.2 J7 - COM This port is utilized to interconnect to a remote communication
system for remote monitoring and control. Refer to
Section 6.0
for
additional information.
4.
FAULT CIRCUIT DESCRIPTIONS
The MEC 20 engine-generator controller utilizes many analog and digital inputs to perform both
monitoring and control functions. Three types of fault circuits are used to monitor and control the
engine-generator set. The first type is
Internal Fault Circuits
that are derived from a
combination of digital and analog inputs. The second type is
Digital Input Fault circuits
that are
initiated from external contact inputs. The third type is
Analog Input Fault circuits
that are
initiated from external analog signal inputs. The following functional block diagram (FIGURE
#12) shows how all input/output fault circuits are organized.
Summary of Contents for MEC 20
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