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PRODUCT DESCRIPTION
WARNING: IN ORDER TO PREVENT DAMAGES BOTH IN THE PC SERIAL COMMUNICATIONS PORT AND
THE RELAY FRONT RS232 PORT, IT IS COMPULSORY TO CONNECT THE RELAY GROUND TO THE SAME
GROUND AS THE PC. OTHERWISE, USE AN UNGROUNDED COMPUTER.
FOR THIS PURPOSE, PLEASE FOLLOW THE SAFETY INSTRUCTIONS BELOW
3.2.7.1.
SAFETY INSTRUCTIONS
The ground screw shown in the following figure must be correctly grounded.
Grounding
screw
If you want to communicate with the relay using a computer through the front serial port, please ensure that the
computer is grounded to the same ground as the relay.
In case of using a portable computer, it is recommended not to have it connected to its power supply, as in many
cases they are not correctly grounded either due to the power supply itself or to the connector cables used. This
way, feeding the portable PC with its internal battery, the worst case would be an incorrect communication, but we
drastically decrease the possibility of producing permanent damage to the computer or the relay. Beware of the
possibility of losing communication in firmware change processes
This is required not only for personal protection, but also for avoiding a voltage difference between the relay
serial port and the computer port, that could produce permanent damage to the computer or the relay.
GE Multilin will not be responsible for any damage in the relay or connected equipment whenever this
elemental safety rule is not followed.
In case of a firmware flashing process, due to the risk of losing communication, GE Multilin will not be
responsible in case of a communication failure if the relay and PC are not grounded to the same point.
GEK-106273L
MIF Digital Feeder Protection
3-37
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