MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
23
(i.e. adjustable hysteresis) and transient time delay settings. Refer to the
programming instructions for further information.
4.4.2.3.GENERATOR UNDER FREQUENCY
The MEC 2 controller provides an under frequency sensor for the
generator supply. The under frequency sensor is programmable for type
of fault action (i.e. alarm or shutdown), frequency setpoint, and transient
time delay settings. Refer to the programming instructions for further
information.
4.4.2.4.GENERATOR OVER FREQUENCY
The MEC 2 controller provides an over frequency sensor for the
generator supply. The over frequency sensor is programmable for type of
fault action (i.e. alarm or shutdown), frequency setpoint, and transient
time delay settings. Refer to the programming instructions for further
information.
4.4.2.5.GENERATOR OVER CURRENT
The MEC 2 controller provides a 3-phase current sensor for the generator
supply. The current sensor is programmable for type of fault action (i.e.
alarm or shutdown), pickup current setpoint, and transient time delay
settings. Refer to the programming instructions for further information.
4.4.3. BATTERY VOLTAGE ANALOG INPUT
The MEC 2 battery voltage sensor measures DC voltage on terminals B+ and B-
that are connected to the engines cranking battery. The battery voltage sensor
provides information to perform the following control functions:
4.4.3.1.WEAK BATTERY ALARM
The weak battery alarm fault circuit is activated when the battery voltage
drops below a pre-determined setpoint for a specified time delay. The
weak battery alarm will detect a low capacity (i.e. “weak”) battery
condition during the cranking cycle. The weak battery alarm is
programmed for a lower battery voltage setpoint and shorter time delay
than the low battery alarm function. The weak battery alarm fault is
programmable for voltage setpoint level, transient time delay settings and
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