KEYPAD / DISPLAY MCS-Problem Solving Visit us at www.mcscontrols.com Revision – 1.1 1/4/2020
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
Problem1: Unsafe Oil & No Amps • We have a Print to File • We have an Alarm Info Print
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
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.
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.