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12.2 DON'TS
12.2DON'TS
•
Do not connect to the RS232 front port of the relay until being ensured that the relay ground is at the same
level of PC ground.
•
Do not upgrade the relay firmware without first ensuring that relay Settings and Configuration have been
downloaded and saved to a file.
12
Whenever a firmware download is performed into the flash memory, upon startup, the relay will automatically go back
to factory default settings. A saved file will be a record of previously existing settings and relay configuration (I/O, LEDs
and logic). In case the firmware download has not modified the Modbus
saved file can be directly downloaded to the upgraded relay, if the memory map has been modified a new file has to be
generated using EnerVista MII SETUP software.
•
Do not configure the two digital inputs in MIFII to the same logical value.
If done, MIFII will evaluate and monitor only the second digital input, resulting in the first input being useless. There are
two exceptions to this rule; configuring both inputs to the same value is allowed whenever:
1.The assigned value is "No definition". In this case the inputs are not defined and thus not evaluated by the MIFII relay.
2.The assigned value is "General input". In this case, the activation of inputs does not activate any element in the MIFII
protection logic, but the input values (active/non active) are evaluated and can be used with any purpose in the
MIFII configurable logic.
•
Do not use both the 52/a and 52/b inputs to monitor the status of a circuit breaker.
MIFII monitors breaker status by means of a single contact that can be selected as either a 52/a or a 52/b contact,
using both will result in wrong breaker status evaluation.
12-2
MIFII Digital Feeder Relay
12 MIFII DO'S AND DON'TS
®
memory map of the relay, the previously
GEK-106237P
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