MCD500 PCB Replacement MCD 500 PCB Replacement - Instructions
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MCD 500 PCB Replacement - Instructions
Overview
This document describes how to replace the LCP (Local Control Panel) and main control PCB in MCD 500 soft
starters (all models).
N.B.!
Many electronic components are sensitive to static electricity. Voltages so low that they cannot be felt,
seen or heard, can reduce the life, affect performance, or completely destroy sensitive electronic
components. When performing service, proper ESD equipment should be used to prevent possible
damage from occurring.
Instructions
Remove all wiring and links from the soft starter before dismantling the unit. Disassemble the unit according
to the instructions below.
After reassembling the unit, apply control voltage and check that the welcome screen displays correctly.
1. Models MCD5-0021B ~ MCD5-0105B
Remove the top cover and terminal blocks from
the starter. Undo the 5 x Torx screws holding the
top plastic in place. Remove the top plastic.
Lift off the LCP and main control PCB assembly.
Label each SCR firing loom with the number of the
corresponding phase terminal on the main control
PCB, then unplug the looms. Unplug the
thermistor, fan (on selected models) and CT wires
from the main control PCB. Remove the existing
LCP and main control PCB and replace with the
new LCP/PCB.
Plug in the looms, replace 5 x Torx screws, top
cover and terminal plugs.
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