MEC 20 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM047 Rev 13 05/03/30
31
Thomson Technology
once an engine start signal is issued. Refer to the programming instructions for
further information.
5.2.4. SWITCH NOT IN AUTO
The designated programmable output relay will energize when the controller's
operation mode switch is not in the auto position.
5.2.5. OVERCURRENT
The designated programmable output relay will energize when the overcurrent
fault circuit is activated. The output will remain energized until the fault condition
has been manually reset (if programmed as a latching type fault) or until the
overcurrent level drops below the setpoint.
5.2.6. ENGINE READY
The designated programmable output relay will energize when the engine
controller's mode switch is in the auto mode and no shutdown or alarm
conditions are present.
5.2.7. PREHEAT
The designated programmable output relay will energize during the start delay
timer period and cranking period until the engine starts and reaches crank
disconnect speed. The preheat output is typically used for an engine starting aid
such as glow plugs.
Note:
An external pilot relay is required to switch the high
current glow plug load.
5.2.8. GEN READY TO LOAD
The designated programmable output relay will energize when the generators
voltage and frequency exceeds predetermined setpoints (e.g. voltage 90%
nominal, frequency 95% nominal as user programmed) and a warm-up time
delay period expires. Once the output has energized, it will remain latched on
irrespective of voltage/frequency levels until the controller either has a
stop/shutdown signal, or the engine’s speed drops below crank disconnect level.
The voltage, frequency and time delay levels programmable. Refer to
Section
10.3
for Programming.
