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3 HARDWARE
3 HARDWARE 3.1DESCRIPTION
The MIFII system incorporates electronic components that might be affected by electrostatic discharge currents
flowing through certain component terminals. The main source of electrostatic discharges is human body,
especially under low humidity conditions, with carpet floors or isolating shoes. If such conditions are present
special care should be taken while manipulating MIFII modules. Operators, before even touching any
components, must make sure that their bodies are not charged by either touching a grounded surface or by
using an antistatic grounded wrist bracelet.
MIFII Units are made up of different modules, such as:
CPU, which includes the power supply, inputs and outputs.
Magnetic module with 4 current transformers(3 for phases and 1 for ground)
Front module with 16x2 LCD display. It also includes the front RS232 communication port.
The metallic case of the unit is highly resistant to corrosion. It is made of stainless steel (AISI 304), coated with an epoxy
layer, and the rest of the metallic pieces are covered with a high quality resistive coating that has successfully passed at
least 96 hours in the salt spray chamber (S/N ASTM B-117).
The front of the relay is made of a shielded high quality thermoplastic, flame retardant (V0), highly resistive material, which
guarantees the unit's immunity to all types of EMI/RFI/ESD interference. As well, an IP52 (IEC 529) protection degree
against dust and water through the front and with the relay mounted in the panel.
The modular design of the relay simplifies repair or replacement of its components, without the need to manipulate the
wiring. These types of operations must be performed exclusively by qualified personnel and only after removing auxiliary
voltage from the unit.
GEK-106237P
WARNING
Figure 3–1: MIFII FRONT VIEW
MIFII Digital Feeder Relay
3.1 DESCRIPTION
3.1.1 MECHANICAL DESCRIPTION
3
3-1
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