MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
53
The controller will automatically exit the Program Mode when an internal timer set for
999 seconds, expires from when a key press was last received by the controller.
Note: The display menu will automatically revert to a low power “sleep” mode following
the expiry of the 999 second internal timer.
9.3. MAIN PROGRAMMING MENU
The main programming menu contains general system configuration programming such
as system input voltages, currents, transformer ratios, as well as standard operating time
delay functions. The programming prompts are listed in order as they appear in the
MEC 2 software. To program the specific MAIN MENU items, refer to the following
descriptions:
9.3.1. SYSTEM VOLTAGE
Set to nominal system voltage as expressed in “phase to phase” voltage (i.e. a
347/600 volt system would be entered as “600”). The programmable range of
values is 120V-15,000V.
9.3.2. SYSTEM FREQUENCY
Set to nominal system frequency of either 50Hz or 60Hz.
9.3.3. SYSTEM PHASES
Set to match the power distribution system used on the generator set (i.e. either
single phase or 3 phase system).
9.3.4. NEUTRAL CONNECTED
Set to “Yes” if generator’s neutral conductor is connected to the MEC 2 controller
terminal TB1-VN and it is desired to display line-neutral AC voltages for a 3
phase, 4 wire system.
9.3.5. VOLTAGE SENSING RATIO
For direct voltage sensing wiring connections from 208 to 600 volts, enter “1” (i.e.
a ratio of “1:1”). When potential transformers are utilized for voltage sensing,
enter the calculated
transformer ratio (e.g. when using 600:120 transformers,
enter a number of “5”).
9.3.6. CURRENT SENSING RATIO
For current sensing wiring connections from current transformers (CT’s), enter
the calculated CT ratio (e.g. when using a 600:5 CT, enter a number of “120”).
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