GMT100 User Manual
TRACGMT100UM001
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3.
.
Relay Output
There is a built-in cut relay on GMT1 00, and it is a NC(Normal Close) type relay w hich
maximum switching voltage is 12VDC an d ma ximum continuous curre nt is 20A. On
GMT100 user cable one 18AWG yellow wire is connected to the relay NC contact and the
other 18AWG yellow wire is connected to the relay COM contact. In certain instances the
two wires will be connected together.
Note:
1: The rela y output can b e latched by the software, so even if the GMT10 0 is restart or
power down in some cases, the relay output will not change. To use the latch function the
main power and backup battery should be connec ted. Otherwise the relay will be always
in normal close status.
2: The relay works only with 12V main powe r. Use it when the main pow er is 24V may
result in damaging.
3:
Many modern relays come with a flyback diode pre-installed internal to the relay itself. If
the relay has this diode, ensure the relay polarity is properly connected. If this diode is not
internal, it should be added externall y. A common diode such as a 1N4004 will work in
most circumstances.
Figure
7
.
Typical Connection with Relay
