MYDAX 1M9W-S, Инструкция по эксплуатации и техническому обслуживанию

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Mydax, Inc. 1M9W-S Water Cooled Chiller
Lawrence Berkeley Laboratory 7
ERROR MESSAGES
A unique feature of Mydax systems is the error messages displayed on the 2 by 40-character liquid crystal display (LCD).
The microprocessor constantly checks various points and parameters throughout the system and automatically displays
messages when error conditions are sensed. Many displays are announced by an audible alarm and LED indicator. The
error message persists until the fault condition is resolved, provided that the fault condition was not fatal, resulting in
a system shutdown.
Condenser Hot Indicates high discharge pressure condition with temperature over +50°C. This is a warning message
only. A separate mechanical overpressure switch, part of the safety interlock loop, shuts the system
down in case of an overpressure condition. The purpose of this message is to allow maintenance
workers to correct the problem at an early stage. (Caused by a clogged filter, low or warm condenser
cooling water flow or condenser scale build-up.)
Fill Tank Indicates low tank liquid level.
Tank Too Hot Indicates that the reservoir temperature is more than 10°C above the highest allowable set point.
Microprocessor shuts down the system.
Push Reset Indicates that the reset button has not been pushed since the last system power-up or that the system
interlock loop has a fault condition.
A series-wired safety interlock loop protects all Mydax systems, disconnecting AC power from nearly
all circuitry. The loop consists of the freon pressure switch, tank "hot" sensor and low level switch.
If any link in the loop is opened, the "Push Reset" error message is displayed. Once the fault is
corrected, the Reset button must be used to re-establish loop integrity. The reset button must also be
pushed at system power up.
Phase Missing Indicates that one or more electrical phases are missing.
Phase Reversed Indicates that electrical phases are incorrectly connected. Reverse any two legs.
Low AC Line Indicates a low voltage condition exists on the input AC line.
Open RTD Indicates that an RTD connected to the M1002 Input Board has failed and that the system has shut
down to prevent damage due to lack of data. The RTD at fault may be located by accessing Test Panel
#8. The RTD must be replaced for the system to operate again.