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3.1.5 Human Machine Interface (HMI) Module
The operator can access the GRT100 via the human machine interface (HMI) module. As shown
in Figure 3.1.5, the HMI module has a liquid crystal display (LCD), light emitting diodes (LED),
view and reset keys, operation keys, testing jacks and an RS-232C connector on the front panel.
The LCD consists of 40 columns by 4 rows with a backlight and displays record, status and setting
data.
There are a total of 8 LED indicators and their signal labels and LED colors are defined as follows:
Label Color Remarks
IN SERVICE Green Lit when relay is in service.
TRIP Red Lit when trip command is issued.
ALARM Red Lit when failure is detected.
TESTING Red
Lit when disabling automatic monitoring function or resetting
the time counting of THR and V/F elements by the
scheme switches.
(LED1) Red
(LED2) Red
(LED3) Red
(LED4) Red
LED1 to LED4 are user-configurable.
Once it has started operating, the TRIP LED continues to operate even after the trip command
disappears. Pressing the RESET key resets it. Other LEDs operate as long as a signal is present.
The RESET key is ineffective for these LEDs.
The VIEW key starts the LCD indication and switches between windows. The reset key clears the
LCD indication and turns off the LCD backlight.
The operation keys are used to display the record, status and setting data on the LCD, input the
settings or change the settings.
The monitoring jacks and two pairs of LEDs, A and B, on top of the jacks can be used while the
test mode is selected in the LCD window. Signals can be displayed on LED A or LED B by
selecting the signal to be observed from the "Signal List" or "Variable Timer List" and setting it in
the window and the signals can be transmitted to an oscilloscope via the monitoring jacks. (For the
"Signal List" or "Variable Timer List", see Appendix B or C.)
The RS-232C connector is a 9-way D-type connector for serial RS-232C connection. This
connector is used for connection with a local personal computer.