KEYPAD / DISPLAY

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MCS-Problem Solving

This presentation will discuss solving problems

using information provided by the MCS-

MAGNUM

Some forms of information recorded include: Print to File, Alarm Info & Graphs

We will review solving the following 2 problems Problem1: Unsafe Oil & No Amps

Problem2: Suct Superheat Hunting

Problem Solving

Problem1: Unsafe Oil & No Amps

We have a Print to File

We have an Alarm Info Print

Print to File

Print to File (System Info Portion)

Print to File (Alarms Portion)

Print to File (Alarm Info Portion)

What Do We Do?

If we have no amps there is something

mechanical holding off the power to the common

of our relay.

It could be a high discharge mechanical

switch?

It could be the motor overload?

It could be a circuit breaker?

Check the wiring diagram.

Problem2: Suct Superheat Hunting

We have a graph showing interaction of data

Graph

Graph Expanded Scale

Interaction of Data

When Liquid Injection comes on it drives Discharge temperature down in 1 min & 15 sec from 180F to 170F. Then, because of the large amount of refrigerant it goes down another 10F to 160F.

Next we see Suction temperature and Suction Superheat going down.

Solution Modulate Liquid Injection so it brings down discharge temperature at a slower pace and has very little overshoot.

Graph (After Liquid Injection Adj)

Graph (After Liquid Injection Adj)

Results After Adjustments

When Liquid Injection comes on now it drives Discharge temperature down in 7 to 12 min depending on load. The overshoot is usually less than 1 F.

Next we see Suction temperature remains steady to maybe .5 F

So by analyzing the interaction of data we can pinpoint the problem an resolve.