GEK-113188A
MIGII Digital Protection for Electrical Machines
3-1
3 HARDWARE
3.1 DESCRIPTION
3
3 HARDWARE 3.1DESCRIPTION
WARNING
MIGII 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.
Figure 3–1:
MIGII
FRONT VIEW
3.1.1 MECHANICAL DESCRIPTION
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.
The
MIGII
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
MIGII
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.
Summary of Contents for Multilin MIGII
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