The mGARD-SYM also provides an isolated connection to an external modbus RTU network. All 50 devices can be
monitored remotely using a single configurable modbus address. Built-in electrical isolation protects the modbus
network from hazardous voltages or transients. The display is compatible with several modbus speeds; 1200, 2400,
4800, 9600, 19200 and 38400 baud. Stop bits are selectable (1 or 2). Data available through modbus includes relay
status and fault levels as well as remote reset.
For more information on the mGARD-SYM display refer to the mGARD-SYM manual (C-416EM).
Figure 3.0 mGARD-SYM Remote Indicator
3.4 RESET
The mGARD-100 has a built in test/reset pushbutton button located on the faceplate. After a trip, the relay remains
in the tripped state until the ground fault has been cleared and the reset button has been pressed, or the control
voltage is removed from terminals L- & N+.
It is NOT necessary to press the remote test/reset button after the ground fault has been cleared when the
mGARD-100 is set in the pulsed trip auto reset mode. In this mode the relay will reset automatically in 3 seconds.
For remote reset capability, the relay must be connected to an mGARD-SYM remote indicator.
3.5 GROUND FAULT TEST
Double clicking the pushbutton located on the relay faceplate invokes a relay test. A simulated current which
exceeds the trip current set on the trip level DIP switches replaces the measured current. Once the trip delay time
set on the trip delay DIP switch has elapsed, the relay should trip and the green LED will blink at a fast rate. This
procedure tests the functionality of the unit.
After the trip, if the relay operating mode is manual reset, the output relay will remain tripped and the green LED
will blink fast until the reset button is pressed. If the relay operating mode is pulsed trip auto reset, the output relay
will reset and the green LED will revert to a slow flash 3 seconds after the test button was pushed or the test was
remotely invoked.
