Table of Contents
Advertisement
11.1 MIFII FAQ
Check that the wire connections follow the table below
11
Q7 How do I connect MIFII terminals SDA - SDB to an RS485/RS232 converter?
A7 The RS485 standard defines terminals "A" and "B" for communication, therefore, the connection will be MIFII SDA with
converter's terminal A, and MIFII SDB with converter's terminal B. However it is usual to identify terminals as "+" and "-",
taking for granted that terminal "A" will correspond to "-", and terminal "B" with "+". In this case, connections must be: MIFII
terminal SDA with "-", and terminal SDB with "+".
Anyway, it is recommended to check the converter's documentation to confirm the manufacturer's criterion. For the
concrete case of GE PM's F485 converter, connections are SDA with "-"and SDB with "+".
Q8 After the previous steps, I cannot communicate through the rear RS485 port.
A8 Check the following:
Communications port in EnerVista MII SETUP (COM1, COM2, etc.)
Baud rate is the same for EnerVista MII SETUP, the relay and the converter (if a setting is available)
Relay number and password is the same in the PC and the relay
Check the connections of SDA and SDB terminals in MIFII with the converter.
Selection of the converter's device type DTE/DCE.
Is the RS485 wire grounded in order to reduce noise?
Q9 How can I get the last version of firmware, PC software and instruction manual?
A9
Urgent: Via Internet on our website www.gedigitalenergy.com/multilin Make sure you subscribe to all MIFII data, in
order to be informed about updates by e-mail.
Post: Sending a fax to GE Multilin (+34 94 485 88 45)
Q10 My MIFII unit has been powered off and I do not know if the stored information will be lost.
A10 MIFII relays have three different types of memory: FLASH, where the protection program is stored; this memory is
maintained indefinitely without power supply; EEPROM, where the protection settings are stored; this memory is also
maintained indefinitely; and RAM, where events and oscillography records are stored. The RAM memory is maintained for
48 hours without power supply, and after this time data will be lost. The unit date and time is also maintained for 48 hours
without power supply.
Q11 Once the program events have been checked, I would like to analyze them more in detail. Can I export these
data and work with them with a different application?
A11 EnerVista MII SETUP software allows saving events in a CSV format file. This format is used by different applications
(e.g. Microsoft Excel‰), and consists of a series of data separated by comas. Once the information is saved in this format,
they can be analyzed using all tools that accept this file format.
i.
The rest of pins are not used.
11-2
CONNECTOR
PIN
MIFII
DB9
2
PC
DB9
2
MIFII Digital Feeder Relay
11 MII FAMILY FAQ (FREQUENTLY ASKED QUESTIONS)
i
:
PIN
PIN
PIN
PIN
3
4
5
6
3
4
5
6
GEK-106237P
Advertisement
Table of Contents
