Bitzer ST-150-2 Manual

ST-150-2
Compressor module screw compressors
Translation of the original document
English....................................................................................................................................................... 2
Verdichtermodul für Schraubenverdichter
Originaldokument
Deutsch ..................................................................................................................................................... 17
CM-SW-01
Electrically skilled installer
Elektrisch unterwiesener Monteur

ST-150-22
Table of contents
1 Introduction............................................................................................................................................................3
2 Safety ....................................................................................................................................................................3
2.1 Authorized staff..............................................................................................................................................3
2.2 Residual risks ................................................................................................................................................3
2.3 Safety references...........................................................................................................................................3
2.3.1 General safety instructions ................................................................................................................ 3
3 Technical data .......................................................................................................................................................4
4 Control and monitoring functions...........................................................................................................................6
4.1 Control functions............................................................................................................................................6
4.2 Monitoring and protective functions ...............................................................................................................6
5 Electrical connection..............................................................................................................................................7
5.1 Schematic wiring diagram for CSW105 .........................................................................................................7
5.2 Schematic wiring diagram for OS.95 .............................................................................................................9
5.3 Wiring in the state of delivery.......................................................................................................................11
5.4 High pressure limiter....................................................................................................................................11
6 Connecting cables ...............................................................................................................................................11
6.1 Required electrical connections to CM-SW-01 ............................................................................................11
6.2 Optional electrical connections ....................................................................................................................12
6.3 Connecting system controller ......................................................................................................................12
6.3.1 Control via Modbus interface ........................................................................................................... 12
6.3.2 Control via analogue signal.............................................................................................................. 12
6.4 Connecting operation monitoring via the BEST SOFTWARE .....................................................................12
7 Protective functions .............................................................................................................................................13
8 Monitoring the operating parameters using the BEST SOFTWARE ...................................................................15
8.1 Communication via the BEST SOFTWARE ................................................................................................15
8.2 Configuring CM-SW-01 with the BEST SOFTWARE ..................................................................................15
8.2.1 Selecting the motor start function .................................................................................................... 16
8.2.2 Setting the current time.................................................................................................................... 16
8.2.3 Changing the limit values for high and low pressure ....................................................................... 16
8.2.4 Configuring a spare part .................................................................................................................. 16
8.3 Data log .......................................................................................................................................................16

ST-150-2 3
1 Introduction
The CM-SW-01 compressor module integrates the en-
tire electronic periphery of the compressor:
The CM-SW-01 monitors the essential operating para-
meters of the screw compressor and protects it from
operation under critical conditions. The module continu-
ously controls the compressor depending on the capa-
city requirements of a superior system controller. It con-
trols the capacity and, depending on the compressor
type, the internal volume ratio (Vi), the oil heater and
optional oil return. The module provides voltage supply
for the associated solenoid valves. It ensures an un-
loaded compressor start and controls the activation and
deactivation of the motor contactors during the start.
Additional time relays are not required.
During the operation, numerous operating data of the
compressor can be tracked using the BEST
SOFTWARE for example, the position in the application
limits diagram. These data are recorded and allow the
system operation to be diagnosed. 4 coloured LEDs in-
dicate the operating condition of the compressor mod-
ule.
This Technical Information describes the control and
monitoring functions, the electrical connection of the
compressor module and the communication with the
BEST SOFTWARE. For detailed information on Mod-
bus programming and further technical data, see Refer-
ence Guide SG-160.
2 Safety
Compressors and compressor module have been built
in accordance with state-of-the-art methods and current
regulations. Particular importance was placed on user
safety.
The notes given in the Operating Instructions of the
compressor must be followed in addition to this Tech-
nical Information.
Always keep the operating instructions and this tech-
nical information in the vicinity of the refrigeration sys-
tem during the whole lifetime of the compressor.
2.1 Authorized staff
All work done on the compressors, the refrigeration
systems and their electronic accessories may only be
performed by qualified and authorized personnel who
have been trained and instructed accordingly. The local
regulations and guidelines will apply with respect to the
qualification and expertise of the specialists.
2.2 Residual risks
Compressors and electronic accessories may present
unavoidable residual risks. This is why any person
working on this device must carefully read this docu-
ment!
The following regulations shall apply:
• the relevant safety regulations and standards (e.g.
EN378, EN60204 and EN60335),
• generally accepted safety rules,
• EU directives,
• national regulations.
2.3 Safety references
are instructions intended to prevent hazards. Safety ref-
erences must be stringently observed!
!
!
NOTICE
Safety reference to avoid situations which may
result in damage to a device or its equipment.
CAUTION
Safety reference to avoid a potentially hazard-
ous situation which may result in minor or mod-
erate injury.
WARNING
Safety reference to avoid a potentially hazard-
ous situation which could result in death or seri-
ous injury.
DANGER
Safety reference to avoid an imminently hazard-
ous situation which may result in death or seri-
ous injury.
2.3.1 General safety instructions
WARNING
Risk of electric shock!
Before working on the module housing and
electrical lines: Switch off the main switch and
secure it against being switched on again!
Close the module housing before switching on
again!

ST-150-24
!
!
NOTICE
The compressor module may be damaged or
fail!
Never apply any voltage to the terminals of CN7
to CN12 – not even for test purposes!
The voltage applied to the terminals of CN13
must not exceed 10V!
The voltage applied to terminal 3 of CN14 must
not exceed 24V! Do no apply voltage to the
other terminals!
Never apply voltage to the voltage outputs, not even for
testing.
3 Technical data
Compressor module
Operating voltage 115 .. 230V +10%/-15%, 50/60Hz, max. 600VA
Required fuse (F3) 4 A time-lag at 230V / 8Atime-lag at 115V
Inputs, outputs and peripheral devices
Relay outputs for motor contact-
ors
Terminal strip CN2, terminals 1 and 2
Maximum continuous current 2.5A
Switching voltage 240VAC
Maximum switching current 2.5A
Switching capacity 300VA inductive (NC contact: D300, NO contact:C300)
Input for release signal Terminal strip CN2, terminal 3
115 .. 230V +10%/-15%, 50/60Hz, max. 2,5A
Signal output "collective
fault" (H10)
Terminal strip CN2, terminal 4
115 .. 230V +10%/-15%, 50/60Hz, max. 2,5A (C300)
Connection for high pressure
switch (F5)
Terminal strip CN3
115 .. 230V +10%/-15%, 50/60Hz, max. 2,5A
Terminal 1: Output, NO contact
Terminal 2: Input
HS. and OS. compressors
Voltage supply of the optional
solenoid valve in the oil return
line (Y9)
Terminal strip CN4
Output with overload protection, voltage output corresponds to the selected op-
erating voltage
Semiconductor switch, not potential free
Use a solenoid coil with maximum power consumption of 12W at 230V / 14W
at 115V.
CS.105
Oil heater (R1)
Terminal strip CN4
Output with overload protection, voltage output corresponds to the selected op-
erating voltage
Semiconductor switch, not potential free
Use an oil heater with maximum power consumption of 300W at 230V. The
output is only suitable for oil heater connection at 230V supply voltage.
All screw compressors
Voltage supply of the solenoid
valves for capacity control and
Vi slider
Terminal strip CN6
Output with overload protection, voltage output corresponds to the selected op-
erating voltage
Semiconductor switch, not potential free
All solenoid valves are included in the extent of delivery of the compressor.
Use only original spare parts!

ST-150-2 5
All screw compressors
Analogue signal for capacity
control
Terminal strip CN13
0 .. 10 VDC, ±2% at 100%
at max. 1mA
All screw compressors
Modbus connection
Terminal strip CN14
Modbus RTU, RS485
Connection cables
Connection cable for power
connections : compressor mod-
ule and peripheral devices
Terminal strips CN1 to CN6
The terminals are suitable for max. 2.5mm2 (AWG12)
Voltage output corresponds to the selected operating voltage
Select the cable cross-sections in accordance with the local regulations!
Use copper cables with a sheath quality suitable for at least 85°C. Select the
cable quality according to the place of installation, e.g. UV- and/or oil-resistant.
Connection cable for control
and sensor signals
0 .. 10V
Terminal strips CN7 to CN14
The terminals are suitable for max. 1.5mm2 (AWG16)
Select the cable cross-sections in accordance with the local regulations!
Use copper cables with a sheath quality suitable for at least 85°C. Select the
cable quality according to the place of installation, e.g. UV- and/or oil-resistant.
Available cable bushings in the
module housing
OS.95:
Screwed joints:
1xM20x1,5 for 1 cable with clamping range Ø8 to 13mm
1xM16x1,5 for 1 cable with clamping range Ø5 to 10mm
Blind caps: 1xM25x1,5 and 1xM16x1,5
Cable plug for 1 cable with Ø5mm
CS.105:
Screwed joints: 1xM20x1,5 for 1 cable with clamping range Ø8 to13mm
Blind cap: 1xM16x1,5
Cable plugs for 2 cables with Ø7mm and 2 cables with Ø5mm
Characteristics of the compressor module
Enclosure class Module housing in its state of delivery: IP65
Compressor module without module housing: IP00
Internal overcurrent protection Terminal strips CN4 to CN6
This fuse protects the CM-SW-01 against short-circuit if a short-circuit occurs
in one of the connected solenoid valves or in the oil heater of the CS.105.
An alarm message is output in the BEST SOFTWARE or via Modbus.
Place of installation Allowable ambient temperature: -30°C .. +70°C
Allowable relative humidity: 5% .. 95% (EN60721-3-3 Classes 3K3 and 3C3)
Maximum allowable altitude: 2000m
EMC The compressor module complies with the EU EMC directive 2014/30/EU
Interference immunity
EN61000-6-1:2007, Immunity for residential, commercial and light-industrial
environments
EN61000-6-2:2005, Immunity for industrial environments
Emitted interference

ST-150-26
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 (Vi).
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 (Vi)
The module automatically sets the most suitable Vi 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 Vi 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)

ST-150-2 7
Monitored
function
Com-
pressor
Measuring sensor
Discharge
gas tem-
perature
HS./OS. Discharge gas temperature
sensor (R2)
Oil temper-
ature
CSW105 Oil temperature sensor (R2)
Oil supply HS./OS. Opto-electronic oil monitor-
ing (F7)
Minimum
oil level
CSW105 Opto-electronic oil monitor-
ing (F8)
Motor tem-
perature
HS./
CSW105
PTC sensor in motor wind-
ings (R3..8)
Rotation
direction
HS./
CSW105
Instrument leads on the
bolts of the motor power
supply
Unloaded
start
All Slider position indicator
The compressor module compares the measured val-
ues with programmed data, sending signals via Mod-
bus and indicating the operating condition by means of
differently coloured LEDs. The compressor will be shut
down in case of operation beyond the application limits,
lack of oil, excessive motor temperature, wrong rotation
direction or critical motor start, see chapter Protective
functions, page 13.
5 Electrical connection
Keep the compressor module energized when the mo-
tor is not running. This ensures an unloaded start. With
CS. compressors, the module activates the oil heater, if
necessary, thus ensuring the lubricity of the oil even
after a long standstill period.
De-energize the module only if you plan a long stand-
still period of the compressor or for maintenance pur-
poses.
5.1 Schematic wiring diagram for CSW105
Abbr. Component
B2 Superior controller
B5 Slider position indicator (SPI)
B6 High pressure transmitter
B7 Low pressure transmitter
F1 Main fuse
F2 Compressor fuse
F3 Control circuit fuse
F5 High pressure switch
Abbr. Component
F8 Oil level switch (minimum oil level)
F13 Overload protective device
F15 Oil level switch (maximum oil level, option
of the compressor)
F17 Control transformer fuse
F24 Phase monitoring fuse
H10 Light "collective fault"
K1 Main contactor (star-delta)
K2 Delta contactor (star-delta)
K3 Star contactor (star-delta)
K4 Auxiliary relay
M1 Compressor
Q1 Main switch
R1 Oil heater
R2 Oil temperature sensor
R3..8 Temperature sensor in the motor
R10 Optional temperature sensor
S1 Control switch (on/off)
S2 Reset of CM-SW-01
T1 Control transformer (example for 230V, re-
quired according to EN60204-1)
Y1 Solenoid valve "capacity regulator CR+"
Y2 Solenoid valve "capacity regulator CR-"
Y6 Solenoid valve "ECO"
Y11 Solenoid valve "Vi slider +"
Y12 Solenoid valve "Vi slider -"
Y13 Solenoid valve "oil return from the flooded
evaporator"
Tab.1: Legend for CSW105 schematic wiring diagram with CM-
SW-01 and star-delta start
The CSW105 compressor has a connection for oil and
gas return as an option for systems with flooded evap-
orator. For connection position, see Operating Instruc-
tions SB-170, chapter Mounting, Connections and di-
mensional drawings, position 17. The electrical integra-
tion of this option is shown in the paths 24 to 26. The
switching times of the solenoid valve must be controlled
by the superior system controller and individually tested
for each system.

ST-150-28
1 2 3 4
CN1
L N
CN2
K2control
Supply
Supply
K1control
RelayC
RelayNC
CN3
HPS
HPS
CN4
Control1
Control1
CN5
Control2
Control2
CN6
CR+
CR+
CR–
CR–
Vi+
Vi+
Vi–
Vi–
5 6 7 8
CN7
1 2 3 4 1 2
CN9 CN10
1 2 3 4 5 6
CN12
1 2 3 4
CN11
1 2
CN13
1 2 3 4
CN14
24 upVS
GND
Signal
GND
PTC PTC
Signal
GND
Signal
GND
5 upVS
Signal
GND
5 upVS
Signal
GND
Input
GND
Data+
Data–
Sup In
GND
St/Sp-
24V Sup
GND
Signal
GND
St/Sp+
INIT-
INIT+
21 3 4 1 2 1 N 1 N 1 N 3 N 5 N 7 N
CM SW- -01
4321 876
513
1211
109 14 15 16 17 18 19 20 21 22 23 24 2625
S2
F2
L1 L2 L3 PE F1
Q1
1 0
K1 10 K2
11
F13 8
K3 12
F17
230V
T1
F3 4A T
PE
S1
01
F13 2
H10
2/2/2
K1 K2
K3 12
Y11
Y2
Y12
4/4/4/25
orange
F8
Modbus
RS485
PE
0 .. 10V
1 2
CT-1 CT-2
CN8
B5
5/5/5
K3
11
PEF5
P>
Y1
R1
230 V
1 2 3
7 8 9
T1
R3..8
T2
blue/blau/bleu brown/braun black/schwarz
F24
3 2 1
grey/grau/gris
brown/braun/marron
pink
rosa rose
blue/blau/bleu
blue/blau/bleu
brown/braun/marron
grey/grau/gris
yellow/gelb/jaune
pink/rosa/rose
green/grün/vert
M 3~
M1
1 2
K4
K2 11
schwarz/black/noir
B6 B7 R2 R10
blau/blue/bleu
schwarz/black/noir
braun/brown/marron blau/blue/bleu braun/brown/marron blau/blue/bleu braun/brown/marron
1A FF
F15
grey
grau
gris
brown/braun/marron
blue/blau/bleu
orange
orange
orangepink
rosa rose
Y13
B2
26
K4 25
Fig.1: CSW105 with CM-SW-01 and star-delta start

ST-150-2 9
5.2 Schematic wiring diagram for OS.95
Abbr. Component
B2 Superior controller
B5 Slider position indicator (SPI)
B6 High pressure transmitter
B7 Low pressure transmitter
F1 Main fuse
F2 Compressor fuse
F3 Control circuit fuse
F5 High pressure switch
F7 Oil flow switch
F12 Control unit ECO
F13 Overload protective device
F16 Rotation direction monitoring
F17 Control transformer fuse
H10 Light "collective fault"
K1 Main contactor (star-delta)
K2 Delta contactor (star-delta)
K3 Star contactor (star-delta)
M1 Compressor
Q1 Main switch
R2 Discharge gas temperature sensor
R10 Optional temperature sensor
S1 Control switch (on/off)
S2 Reset of CM-SW-01
T1 Control transformer (example for 230V, re-
quired according to EN60204-1)
Y4 Solenoid valve "capacity regulator CR+"
Y5 Solenoid valve "capacity regulator CR-"
Y8 Solenoid valve “ECO” (option of compressor)
Y9 Solenoid valve "oil return”
Y11 Solenoid valve "Vi slider +"
Y12 Solenoid valve "Vi slider -"
Tab.2: Legend for OS.95 schematic wiring diagram with CM-SW-01
and star-delta start
The schematic wiring diagram shows a star-delta mo-
tor. OS.95 compressors can also be operated with
other motors. In this case, the time relay control suit-
able for the motor type must be set using the BEST
SOFTWARE, see chapter Selecting the motor start
function, page 16.

ST-150-210
1 2 3 4
CN1
L N
CN2
K2control
Supply
Supply
K1control
RelayC
RelayNC
CN3
HPS
HPS
CN4
Control1
Control1
CN5
Control2
Control2
CN6
CR+
CR+
CR–
CR–
Vi+
Vi+
Vi–
Vi–
5 6 7 8
CN7
1 2 3 4 1 2
CN9 CN10
1 2 3 4 5 6
CN12
1 2 3 4
CN11
1 2
CN13
1 2 3 4
CN14
24 upVS
GND
Signal
GND
PTC PTC
Signal
GND
Signal
GND
5 upVS
Signal
GND
5 upVS
Signal
GND
Input
GND
Data+
Data–
Sup In
GND
St/Sp-
24V Sup
GND
Signal
GND
St/Sp+
INIT-
INIT+
21 3 4 1 2 1 N 1 N 1 N 3 N 5 N 7 N
CM SW- -01
4321 876
513
1211
109 14 15 16 17 18 19 20 21 22
S2
F2
L1 L2 L3 PE F1
Q1
1 0
K2 11
M3~
K3 12
F17
230V
T1
F3 4A T
PE
S1
01
F13 2
B2
H10
W1
V1
U1
V2
U2
W2
M1
2/2/2
K1 K2
K3 12
Y11
Y5
Y12
4/4/4/31
grey/grau/gris
brown/braun/marron
orangepink
rosa rose
blue/blau/bleu F7
Modbus
RS485
PE
0 .. 10V
blue/blau/bleu
brown/braun/marron 1 2
CT-1 CT-2
CN8
B5
5/5/5
K3
11
PE
F5
P>
Y9 Y4
grey/grau/gris
yellow/gelb/jaune
pink/rosa/rose
green/grün/vert
F16
K1 10
F13 8
B6 B7 R2 R10
blau/blue/bleu
schwarz/black/noir
braun/brown/marron blau/blue/bleu braun/brown/marron blau/blue/bleu braun/brown/marron
schwarz/black/noir
F12
... 31
K2 11
Y8
P<
1k
Fig.2: OS.95 with CM-SW-01 and star-delta start

ST-150-2 11
5.3 Wiring in the state of delivery
Components shown in grey in the schematic wiring dia-
gram are included in the extent of delivery of the cor-
responding compressor. In the state of delivery of the
compressor, these components are completely in-
stalled and wired. Modification to these components or
their wiring is not required.
Dashed components or current paths represent com-
pressor options. Components connected to the com-
pressor module that are shown in white are also op-
tions which are not included in the extent of delivery.
CSW105: pre-fitted components
• Slider position indicator (B5)
• Solenoid valves for capacity control and Vi (Y1, Y2,
Y11 and Y12)
• Low pressure and high pressure transmitters (B7
and B6)
• Oil temperature sensor (R2)
• Monitoring of the minimum oil level (OLC-D1, F8)
• Oil heater (R1) at 230V voltage supply
• Motor temperature monitoring (R3 to R8)
• Rotation direction monitoring
OS.95: pre-fitted components
• Slider position indicator (B5)
• Solenoid valves for capacity control and Vi (Y4, Y5,
Y11 and Y12)
• Low pressure and high pressure transmitters (B7
and B6)
• Discharge gas temperature sensor (R2)
• Oil monitoring (OLC-D1, F7)
Voltage supply of the peripheral devices
The compressor module internally supplies the voltage
to the terminal strips CN7 to CN12 and to peripheral
devices (solenoid valves, oil monitoring, slider position
indicator and with CSW105, also phase monitoring and
230V oil heater).
5.4 High pressure limiter
According to EN378 directive, each compressor must
be provided with a high pressure limiter (F5) for safety
cut-out in the safety chain. Depending on the refriger-
ant charge, it must be designed as a safety pressure
cut-out or only as pressure cut-out. The software-con-
trolled monitoring of the compressor module via the
high pressure transmitter (B6) does not sufficiently en-
sure the safety cut-out function. The high pressure lim-
iter (F5) should preferably be connected to terminal
strip CN3 instead of the bridge.
The installation of a low pressure limiter is not neces-
sary, depending on local regulations. The compressor
module is provided with an automatic low pressure cut-
out function.
6 Connecting cables
Electrically connect the compressor module in accord-
ance with the schematic wiring diagrams. Observe the
safety standards EN60204-1, IEC60364 and national
safety regulations.
WARNING
Risk of electric shock!
Before working on the module housing and
electrical lines: Switch off the main switch and
secure it against being switched on again!
Close the module housing before switching on
again!
!
!
NOTICE
The compressor module may be damaged or
fail!
Never apply any voltage to the terminals of CN7
to CN12 – not even for test purposes!
The voltage applied to the terminals of CN13
must not exceed 10V!
The voltage applied to terminal 3 of CN14 must
not exceed 24V! Do no apply voltage to the
other terminals!
Never apply voltage to the voltage outputs, not even for
testing.
6.1 Required electrical connections to CM-SW-01
• Power connection to terminal strip CN1
– Terminal 1: L
– Terminal 2: N
• Command for compressor start (release signal from
the superior system controller, B2)
The release signal from the superior controller is
provided in path8 as the first link of the safety chain.
This release information must be passed on to the
compressor module. It activates the time relay con-
trol for the motor contactors K1, K2 and K3.
– Connect the safety chain (release signal) to ter-
minal strip CN2, terminal3.

ST-150-212
– Integrate the compressor module as the last link
into the safety chain.
• Control signal from the system controller (nominal
value for capacity control)
– Connect the Modbus cable to terminal strip CN14.
– Or connect the analogue signal to terminal strip
CN13.
• High pressure limiter
– Connect it preferably to terminal strip CN3 instead
of the bridge, see chapter Schematic wiring dia-
gram for CSW105, page 7 and see chapter
Schematic wiring diagram for OS.95, page 9.
– Alternatively, it can also be integrated into the
safety chain, in that case after the compressor
module.
6.2 Optional electrical connections
To CN4 with OS.95
With OS.95, the solenoid valve in the oil return line (Y9)
can be connected to terminal strip CN4. It is switched
by the compressor module. If this solenoid valve is
triggered by the superior controller, it must be ensured
that the solenoid valve is closed during compressor
standstill and opens only 3s after compressor start.
With the CSW105 with 230V voltage supply, the oil
heater (standard extent of delivery) which is switched
on and off if needed by the compressor module is con-
nected here.
6.3 Connecting system controller
6.3.1 Control via Modbus interface
Plug or connect the cable to terminal strip CN14, see
chapter Schematic wiring diagram for CSW105, page 7
or see chapter Schematic wiring diagram for OS.95,
page 9.
In this case, the operating parameters can be mon-
itored via Bluetooth by means of the BEST
SOFTWARE.
6.3.2 Control via analogue signal
The compressor capacity may be regulated via a DC
voltage signal. This type of control is mainly suitable for
systems with simple controllers which are equipped
with an output for 0 to 10V and a relay, and if the ter-
minal strip CN14 is used for the BEST SOFTWARE.
• Connection to terminal strip CN13, terminals 1 and
2.
• Control signal: 0 to 10V DC voltage of an analogue
output of the system controller
• As an alternative, a control signal between 4 and
20mA may be connected to terminals 1 and 2. Con-
nect a 400 Ω resistor in series in this case.
• Control accuracy: ±0.5% at 100%
• Linear control characteristic, see figure.
CR
0 2 4 6 8 10 12
U [V]
0 .. 10 V
100%
25%
2,5
Fig.3: Control characteristics
6.4 Connecting operation monitoring via the BEST
SOFTWARE
The BEST SOFTWARE accesses the compressor
module via the Bluetooth interface, see chapter Com-
munication via the BEST SOFTWARE, page 15. This
interface is deactivated in some non-European coun-
tries.
◦ If the Bluetooth interface should not be used:
• Connect the BEST interface converter to terminal
strip CN14 (Modbus).
In this case, the capacity control must be preset via the
analogue signal on terminal strip CN13.

ST-150-2 13
7 Protective functions
The green LED is on during normal operation. The
LEDs can be seen through a sight glass on the right
side of the module housing.
Before the measured value of a sensor reaches a crit-
ical threshold, the compressor module outputs an alarm
signal via the Modbus RS485 interface (CN14). In this
case, the yellow LED lights up. Once a measured value
is considerably outside the allowable range, the com-
pressor module will immediately switch off the motor.
The red LED lights up.
The blue LED lights up when data are transmitted via
the Modbus or the Bluetooth interface.
Depending on the measured values, up to 3 alarm
levels are defined. These alarms are recorded and dis-
played using the BEST SOFTWARE. The alarm levels
make it possible to programme a system controller in a
way that allows the compressor to be controlled within
the application limits.
Warning
The warning threshold is exceeded when the applica-
tion limit is almost reached. The yellow LED lights up.
This is a software message, not a safety reference. The
warning refers exclusively to the critical operating con-
dition of the compressor.
Critical alarm
The cut-out value is exceeded. The yellow LED lights
up. If the corresponding measured value does not drop
again within the corresponding time delay, the com-
pressor will be switched off. This cut-out is classified as
fault in the alarm list.
Fault
The cut-out value has been exceeded too much or for
too long. The compressor is switched off. The red LED
lights up.
Monitored function Time delay
after com-
pressor start
Warning Critical alarm Fault
CSW105
Low pressure --- --- --- < -0.2bar negative pressure
(corresponds to <0.8bar abso-
lute pressure at sea level)
CM-SW-01 locks out immedi-
ately.
High pressure --- --- --- > 21bar excess pressure (cor-
responds to >22bar absolute
pressure at sea level)
CM-SW-01 locks out immedi-
ately.
Application limits
(Condensing temperature,
evaporation temperature)
120s <2K within the
application lim-
its
>2K outside
the application
limits
CM-SW-01
locks out after
30 seconds.
>4K outside the application lim-
its
CM-SW-01 locks out immedi-
ately.
Oil temperature --- >115°C --- >120°C
CM-SW-01 locks out immedi-
ately.
Minimum oil level --- 5s --- CM-SW-01 locks out after 90
seconds.
Rotation direction --- --- --- CM-SW-01 locks out immedi-
ately.
OS.95

ST-150-214
Monitored function Time delay
after com-
pressor start
Warning Critical alarm Fault
Low pressure --- --- --- < -0.6bar negative pressure
(corresponds to <0.4 bar abso-
lute pressure at sea level)
CM-SW-01 locks out immedi-
ately.
High pressure --- --- --- > 28bar excess pressure (cor-
responds to >29bar absolute
pressure at sea level)
CM-SW-01 locks out immedi-
ately.
Application limits
(Condensing temperature,
evaporation temperature)
120s <2K within the
application lim-
its
>2K outside
the application
limits
CM-SW-01
locks out after
30 seconds.
>4K outside the application lim-
its
CM-SW-01 locks out immedi-
ately.
Discharge gas temperat-
ure
--- >95°C --- >100°C
CM-SW-01 locks out immedi-
ately.
Oil supply 15s --- --- CM-SW-01 locks out after 5
seconds.
Reset
Interrupt the voltage supply (L/N) for at least 5 s. All
system related alarms except the motor temperature
monitoring may be reset also via Modbus command or
the BEST SOFTWARE. With the the BEST
SOFTWARE by using the RESET button in the ALARMS
menu.

ST-150-2 15
8 Monitoring the operating parameters using the
BEST SOFTWARE
The BEST SOFTWARE offers comprehensive access
to all operating data and control parameters and can be
downloaded for free from the BITZER website
(www.bitzer.de).
8.1 Communication via the BEST SOFTWARE
Requirements
• Mobile device
– with the operating system Windows7 or newer
– with Bluetooth interface or USB port
– with BEST SOFTWARE installed
The BEST SOFTWARE can be downloaded for
free from the BITZER website (www.bitzer.de).
• In case of communication via the USB port:
– Plug the BEST interface converter into the com-
pressor module (CN14) and the mobile device.
– Compressor control via the analogue connection
(CN13). It is not possible to perform capacity con-
trol simultaneously via the Modbus connection.
Setting up communication
• Switch on the mobile device and start BEST
SOFTWARE (1).
• Click the NEW button (2).
• Select CM-SW-01 (3).
• Click the CONNECT button (4).
The following selection appears: BEST CONVERTER or
BLUETOOTH.
• Selection BEST CONVERTER:
Click the CONNECT button.
The compressor module is now connected to the
mobile device.
• Selection BLUETOOTH:
All available devices are listed.
• Select the CM-SW-01.
• Click the CONNECT button.
• Enter Bluetooth password. Factory setting from firm-
ware version 2.6.58.00 on: "8670", previous ver-
sions: "2"
The CONFIGURATION menu appears with the MAIN SETUP
window. The compressor module is now connected to
the mobile device.
Fig.4: Connecting the CM-SW-01 with the BEST SOFTWARE
8.2 Configuring CM-SW-01 with the BEST
SOFTWARE
In its state of delivery, the compressor module CM-
SW-01 is completely pre-configured for use with the re-
spective compressor.
Check all parameters in menu CONFIGURATION and
change them if necessary. Check particularly these set-
tings:
• MOTOR STARTER FUNCTION for the time relay control of
the motor contactors
• REFRIGERANT
• DATE
• TIME
Fig.5: Menu CONFIGURATION

ST-150-216
8.2.1 Selecting the motor start function
The compressor module controls the activation and de-
activation times of the motor contactors. The BEST
SOFTWARE can be used to choose between star-
delta, part winding or direct on line start.
Adjustment in the BEST SOFTWARE:
• Set the suitable motor start function in the MOTOR
STARTER FUNCTION window of the MAIN SETUP menu.
The compressors starts 1second after the release sig-
nal of the superior system controller, in any case.
8.2.2 Setting the current time
Check the programmed date and time using the BEST
SOFTWARE:
• Check the CONFIGURATION menu, the MAIN SETUP win-
dow and the DATE and TIME lines.
• Correct the data if necessary.
8.2.3 Changing the limit values for high and low
pressure
In the state of delivery, the limit values for high pres-
sure and low pressure cut-out are set for the respective
compressor. The pressure transmitters detect relative
pressures. Depending on the system design, these val-
ues may need to be adjusted. The high pressure can
not be increased further.
Setting new limit values in the BEST SOFTWARE:
• Enter new limit values via CONFIGURATION, window
PROTECTIVE FUNCTIONS, in the lines HIGH PRESSURE
SWITCH: VALUE and LOW PRESSURE SWITCH: VALUE.
8.2.4 Configuring a spare part
If a CM-SW-01 has been replaced, the specific com-
pressor parameters must be set. The time relay control
is preset for star-delta start.
• Connect the mobile device to the new CM-SW-01.
• Open BEST SOFTWARE and select the new CM-
SW-01.
• Update firmware.
• Adjust all MAIN SETUPs in menu CONFIGURATION.
• Check all further parameters and adjust them, if ne-
cessary.
8.3 Data log
All monitored operating parameters and alarm mes-
sages are stored internally:
• All operating parameters in 5- or 10-second intervals
• Storage capacity: approx. 2 weeks in case of normal
operating behaviour
• Alarm messages and statistics of the last 365 days
This data can be exported using the BEST
SOFTWARE. These data enable analysis of the system
operation and provide detailed information for
troubleshooting, Operation monitoring with BEST
SOFTWARE.

ST-150-2 17

ST-150-218
Inhaltsverzeichnis
1 Einleitung.............................................................................................................................................................19
2 Sicherheit.............................................................................................................................................................19
2.1 Autoriertes Fachpersonal.............................................................................................................................19
2.2 Restgefahren ...............................................................................................................................................19
2.3 Sicherheitshinweise.....................................................................................................................................19
2.3.1 Allgemeine Sicherheitshinweise ...................................................................................................... 19
3 Technische Daten................................................................................................................................................20
4 Steuer- und Überwachungsfunktionen ................................................................................................................22
4.1 Steuerfunktionen..........................................................................................................................................22
4.2 Überwachungs- und Schutzfunktionen ........................................................................................................23
5 Elektrischer Anschluss ........................................................................................................................................24
5.1 Prinzipschaltbild für CSW105 ......................................................................................................................24
5.2 Prinzipschaltbild für OS.95 ..........................................................................................................................26
5.3 Verkabelung im Auslieferungszustand ........................................................................................................28
5.4 Hochdruckschalter.......................................................................................................................................28
6 Kabel anschließen ...............................................................................................................................................28
6.1 Erforderliche elektrische Anschlüsse an das CM-SW-01 ............................................................................28
6.2 Optionale elektrische Anschlüsse................................................................................................................29
6.3 Anlagenregler anschließen ..........................................................................................................................29
6.3.1 Steuerung über Modbus-Schnittstelle.............................................................................................. 29
6.3.2 Steuerung über Analogsignal........................................................................................................... 29
6.4 Betriebsüberwachung mit der BEST SOFTWARE anschließen..................................................................29
7 Schutzfunktionen .................................................................................................................................................30
8 Betriebsparameter mit der BEST SOFTWARE überwachen...............................................................................31
8.1 Kommunikation über die BEST SOFTWARE ..............................................................................................31
8.2 CM-SW-01 mit der BEST SOFTWARE konfigurieren .................................................................................32
8.2.1 Motoranlauffunktion auswählen ....................................................................................................... 32
8.2.2 Aktuelle Uhrzeit einstellen................................................................................................................ 32
8.2.3 Grenzwerte für Hoch- und Niederdruck ändern............................................................................... 32
8.2.4 Ersatzteil konfigurieren .................................................................................................................... 33
8.3 Datenaufzeichnung......................................................................................................................................33

ST-150-2 19
1 Einleitung
Das Verdichtermodul CM-SW-01 integriert die gesamte
elektronische Peripherie des Verdichters:
Das CM-SW-01 überwacht die wesentlichen Betrieb-
sparameter des Schraubenverdichters und schützt ihn
vor Betrieb bei kritischen Bedingungen. Das Modul re-
gelt den Verdichter stufenlos entsprechend der Leis-
tungsanforderung eines übergeordneten Anlagenreg-
lers. Es steuert die Leistungsregelung und je nach Ver-
dichtertyp das interne Volumenverhältnis (Vi), die Ölhei-
zung und optional die Ölrückführung. Das Modul liefert
die Spannungsversorgung für die zugehörigen Magnet-
ventile. Es sorgt für einen entlasteten Verdichteranlauf
und steuert die Zu- und Abschaltung der Motorschütze
während des Anlaufs. Zusätzliche Zeitrelais werden da-
für nicht benötigt.
Zahlreiche Betriebsdaten des Verdichters können mit
der BEST SOFTWARE während des Betriebs verfolgt
werden, beispielsweise die Position im Einsatzgrenz-
diagramm. Diese Daten werden aufgezeichnet und er-
lauben eine Diagnose des Anlagenbetriebs. 4 farbige
LEDs signalisieren den Betriebszustand des Verdich-
termoduls.
Diese Technische Information beschreibt die Steuer-
und Überwachungsfunktionen, den elektrischen An-
schluss des Verdichtermoduls und die Kommunikation
mit der BEST SOFTWARE. Detaillierte Information zur
Modbus-Programmierung und weitere technische Da-
ten siehe Reference Guide SG-150.
2 Sicherheit
Verdichter und Verdichtermodul sind nach dem aktuel-
len Stand der Technik und entsprechend den geltenden
Vorschriften gebaut. Auf die Sicherheit der Anwender
wurde besonderer Wert gelegt.
Zusätzlich zu dieser Technischen Information müssen
die Hinweise in der Betriebsanleitung des Verdichters
eingehalten werden.
Betriebsanleitung und diese Technische Information
während der gesamten Verdichterlebensdauer an der
Kälteanlage verfügbar halten!
2.1 Autoriertes Fachpersonal
Sämtliche Arbeiten an Verdichtern, Kälteanlagen und
deren elektronischem Zubehör dürfen nur von Fachper-
sonal ausgeführt werden, das in allen Arbeiten ausge-
bildet und unterwiesen wurde. Für die Qualifikation und
Sachkunde des Fachpersonals gelten die jeweils lan-
desüblichen Vorschriften und Richtlinien.
2.2 Restgefahren
Von Verdichtern und elektronischem Zubehör können
unvermeidbare Restgefahren ausgehen. Jede Person,
die an diesem Gerät arbeitet, muss deshalb dieses Do-
kument sorgfältig lesen!
Es gelten zwingend
• die einschlägigen Sicherheitsvorschriften und Nor-
men (z.B. EN 378, EN 60204 und EN 60335),
• die allgemein anerkannten Sicherheitsregeln,
• die EU-Richtlinien,
• nationale Vorschriften.
2.3 Sicherheitshinweise
sind Anweisungen um Gefährdungen zu vermeiden. Si-
cherheitshinweise genauestens einhalten!
!
!
HINWEIS
Sicherheitshinweis um eine Situation zu vermei-
den, die die Beschädigung eines Geräts oder
dessen Ausrüstung zur Folge haben könnte.
VORSICHT
Sicherheitshinweis um eine potentiell gefährli-
che Situation zu vermeiden, die eine geringfügi-
ge oder mäßige Verletzung zur Folge haben
könnte.
WARNUNG
Sicherheitshinweis um eine potentiell gefährli-
che Situation zu vermeiden, die den Tod oder
eine schwere Verletzung zur Folge haben könn-
te.
GEFAHR
Sicherheitshinweis um eine unmittelbar gefährli-
che Situation zu vermeiden, die eine schwere
Verletzung oder den Tod zur Folge hat.
2.3.1 Allgemeine Sicherheitshinweise
WARNUNG
Gefahr von elektrischem Schlag!
Vor Arbeiten im Modulgehäuse und an elektri-
schen Leitungen: Hauptschalter ausschalten
und gegen Wiedereinschalten sichern!
Vor Wiedereinschalten Modulgehäuse schlie-
ßen!

ST-150-220
!
!
HINWEIS
Beschädigung oder Ausfall des Verdichtermo-
duls möglich!
An die Klemmen von CN7 bis CN12 keine
Spannung anlegen – auch nicht zum Prüfen!
An die Klemmen von CN13 maximal 10V anle-
gen!
An die Klemme 3 von CN14 maximal 24V, an
die anderen Klemmen keine Spannung anlegen!
An Spannungsausgänge niemals Spannung anlegen,
auch nicht zum Prüfen.
3 Technische Daten
Verdichtermodul
Betriebsspannung 115 .. 230V +10%/-15%, 50/60Hz, max. 600VA
erforderliche Sicherung (F3) 4Aträge bei 230V / 8Aträge bei 115V
Ein- und Ausgänge sowie Peripheriegeräte
Relaisausgänge für Motorschüt-
ze
Klemmleiste CN2, Klemmen 1 und 2
Dauerstrom max. 2,5A
Schaltspannung 240V∿
Schaltstrom max. 2,5A
Schaltleistung 300VA induktiv (Öffnerkontakt: D300, Schließkontakt:C300)
Eingang für Freigabesignal Klemmleiste CN2, Klemme 3
115 .. 230V +10%/-15%, 50/60Hz. max. 2,5A
Signalausgang "Sammelstö-
rung" (H10)
Klemmleiste CN2, Klemme 4
115 .. 230V +10%/-15%, 50/60Hz. max. 2,5A (C300)
Anschluss für Hochdruckschal-
ter (F5)
Klemmleiste CN3
115 .. 230V +10%/-15%, 50/60Hz. max. 2,5A
Klemme 1: Ausgang, Schließkontakt
Klemme 2: Eingang
HS.- und OS.-Verdichter
Spannungsversorgung des op-
tionalen Magnetventils in der Öl-
rückführleitung (Y9)
Klemmleiste CN4
Ausgang mit Überlastschutz, Spannungsausgang entspricht der gewählten Be-
triebsspannung
Halbleiterschalter, nicht potenzialfrei
Magnetspule mit maximaler Leistungsaufnahme 12W bei 230V / 14W bei
115V verwenden.
CS.105
Ölheizung (R1)
Klemmleiste CN4
Ausgang mit Überlastschutz, Spannungsausgang entspricht der gewählten Be-
triebsspannung
Halbleiterschalter, nicht potenzialfrei
Ölheizung mit maximaler Leistungsaufnahme 300W bei 230V verwenden.
Ausgang nur bei 230V Versorgungsspannung zum Anschluss der Ölheizung
geeignet.
alle Schraubenverdichter
Spannungsversorgung der Ma-
gnetventile für Leistungsrege-
lung und Vi-Schieber
Klemmleiste CN6
Ausgang mit Überlastschutz, Spannungsausgang entspricht der gewählten Be-
triebsspannung
Halbleiterschalter, nicht potenzialfrei
Alle Magnetventile sind im Lieferumfang des Verdichters inbegriffen. Nur Origi-
nalersatzteile verwenden!