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
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.
Summary of Contents for Copeland EazyCool OME-4MTL-09X
Page 1: ...Copeland Eazycool CO2 Refrigeration Units Application Guidelines ...
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