Don'ts - GE Multilin MIWII Instruction Manual

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.
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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 MIWII to the same logical value.
If done, MIWII 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 MIWII
relay.
2. The assigned value is "General input". In this case, the activation of inputs does not activate any element in the
MIWII protection logic, but the input values (active/non active) are evaluated and can be used with any purpose in
the MIWII configurable logic.
12-2 MIWII Directional Power Protection System
12 MIWII DO'S AND DON'TS
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memory map of the relay, the previously
GEK-113308