Owner manual

11
The Toroid Ground Sensor
The Ground sensor uses a clip-on toroid to detect low level currents on the ground wire that generate a
magnetic field inside the toroid. The Toroid converts this magnetic field to electrical current and passes
it on to the GTRM. If the magnetic field is no longer present, (ground is lost), the current to the GTRM i s
interrupted causing the GTRM to go into alarm.
When the Toroid Sensor is in alarm, the indication will be displayed through
Alarm 2 on the GTRM.
To Install the Toroid Ground Sensor
1. Locate the main ground feed wire that you wish to monitor.
2. Open the clip sensor and place the sensor around the wire.
3. Close the clip sensor around the ground wire.
4. Connect the Ground Sensor wire to the RJ11 jack on the GTRM
5. Enable the Sensor by checking the appropriate box in the Options
Menu of the Web interface.
Connecting the GTRM Channel Terminals
The GTRM can monitor up to 5 different channel lead locations. The channel terminal blocks will accept
18 – 24 AWG wire. It is recommended that you use smaller wire to connect directly to the GTRM
channel terminal blocks and then use a split-bolt style connector to attach the channel wire lead to a
larger wire that will then connect to your ground plate.
1. Using 16 or 18 AWG wire, determine the correct length needed to connect to copper ground
wire or to attach directly to the ground plate.
2. Strip off approx. ¼” of coating to expose copper wire and insert into channel terminal. Screw
down terminal to secure wire. Repeat for the desired number of channels you wish to monitor.
Note: you do not need to wire all terminals. You can use any of the terminals or all of the terminals.
You can activate and deactivate each channel by using the push buttons on top of the GTRM or by
accessing the configuration settings through a web browser.
Activating GTRM Channel Monitoring
The GTRM monitors up to 5 separate channels. Each channel operates independently and can be
activated or deactivated by either the push buttons on top of the unit or through the configuration
menu.