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 (V
i
), 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!
Содержание ST-150-2
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