ST-150-2
6
EN61000-6-3:2007 +A1:2011, emission standard for residential, commercial
and light-industrial environments
The compressor module internally supplies the voltage
to peripheral devices (solenoid valves, slider position
indicator, oil monitoring and/or oil heater) and to the ter-
minal strips CN7 to CN12.
Phase monitoring fuse F24
The HS. and CS. compressors incorporating the com-
pressor module are equipped with the F24 fuse in the
terminal box. It protects the phase monitoring lines.
Such a fuse is also required with open compressors
between module housing and motor terminal box when
the phase monitoring function of the compressor mod-
ule is used.
Technical data of the installed fuse:
• Rated current 1 A
• Release speed FF (very quick acting)
• Rated breaking capacity of 50 kA at 700 V AC
• Dimensions 6.3 x 32 mm
4
Control and monitoring functions
4.1
Control functions
The CM-SW-01 compressor module controls the capa-
city control and the adjustment of the internal volume
ratio (V
i
).
Capacity control
The module continuously adjusts the compressor capa-
city according to the set point of the superior system
controller. With the HS.95, OS.95 and CSW105 com-
pressors, this is done by switching both solenoid valves
CR+ and CR- of the capacity control slider or with other
compressors, by switching the 4 capacity regulators.
Adjustment of the internal volume ratio (V
i
)
The module automatically sets the most suitable V
i
in
each case. To this end, it evaluates the slider position
and the current operating conditions by means of integ-
rated algorithms.
Unloaded compressor start
When the device is switched off, the compressor mod-
ule positions the control slider and the V
i
slider in a way
to ensure an unloaded start of the compressor.
Oil return in OS. and HS. compressors
A option the compressor module may measure out the
returned oil amount. It triggers the solenoid valve in the
oil return line (Y9).
Oil heater in CS. compressors
The module maintains the oil temperature 20 K above
the saturation temperature of the refrigerant. Also dur-
ing standstill , it switches the oil heater on and off. This
increases the total efficiency of the system.
Control of the motor contactors at compressor start
The compressor control module controls the activation
and deactivation times of the motor contactors.
Star-delta motor: The contact at terminal CN2:2 (K1
Control) closes 1 second after the release signal and
reopens after further 2 seconds. The contact at terminal
CN2:1 (K2 Control) closes 1.5 seconds after the re-
lease signal and remains closed until the compressor is
shut off.
Motor for direct on-line start: The contact at terminal
CN2:2 (K1 Control) closes 1 second after the release
signal and reopens when the compressor is shut off.
The contact at terminal CN2:1 (K2 Control) is not used.
For soft start and operation with frequency inverter,
only one motor contactor is required.
In case of open drive compressors or spare part mod-
ules the time relay control needs to be set with the
BEST SOFTWARE according to the motor used, see
chapter Selecting the motor start function, page 16.
4.2
Monitoring and protective functions
The compressor module monitors the signals from sev-
eral sensors located on the compressor:
Monitored
function
Com-
pressor
Measuring sensor
Application
limits:
Condens-
ing and
evapora-
tion tem-
perature
All
Low pressure and high
pressure transmitters (B7
and B6)
Low pres-
sure
All
Low pressure transmitter
(B7)
High pres-
sure
All
High pressure transmitter
(B6)
Содержание ST-150-2
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