Emerson Copeland EazyCool OME-4MTL-09X, Инструкции по применению

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30 C6.1.11/0718-0619/E
Figure 39: Main contactor and circuit breakers
2.12 Compressor safety
2.12.1 Compressor motor protection
Copeland EazyCool CO
2
units are equipped with a Stream 4MTL compressor including CoreSense
Protection technology.
All relevant electrical protection features are covered by the Emerson M200 variable frequency drive.
For more details see the
M200 Inverter Handbook .
The discharge line temperature is monitored and controlled by the iPro controller.
The different areas of the system are limited by different design pressures (Ps)
– see chapter 2.7.10
"Design pressures" for details. There are different levels of protection and control to keep the
pressures within the approved envelope at all times.
2.12.2 High-pressure safety (type-approved pressure limiter)
A type-approved pressure limiter (according to EN 12263) with automatic reset is installed on the
compressor. It is an Alco normally-closed switch.
The pressure cut-out is set to 114 bar and the cut-in is set to 107 bar.
Figure 40: High-pressure cut-out device
2.12.3 High-pressure safety control
There are 3 pressure transmitters assembled in the unit. These transmitters are used for system
control purposes as well as for safety. They are located on the suction side (B1 =
AIC1 ), between
the gas cooler and the high-pressure regulation valve (B2 = AIC2 ), and on the liquid receiver outlet
(B3 = AIC3 ).
The factory setting of the high pressure is slightly below the activation setpoint of the high-pressure
safety switch.
The transmitter on the liquid receiver is also used to limit the liquid receiver pressure during operation
by means of the flashgas-bypass.