Introduction; Safety; Authorized Staff; Residual Risks - Bitzer CM-SW-01 Original-Gebrauchsanweisung

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 controls
the compressor depending on the capacity require-
ments of a superior system controller. It controls the ca-
pacity and, depending on the compressor type, the in-
ternal volume ratio (V ), the oil heater, the oil injection
i
and optionally the oil return. The module provides
voltage supply for the associated solenoid valves. It en-
sures an unloaded compressor start and controls activ-
ation and deactivation of the motor contactors during
the start. Additional time relays are not required. The
high pressure switch can be connected directly to the
compressor module.
During operation, numerous operating data of the com-
pressor can be tracked using the BEST SOFTWARE,
for example the position in the application limits dia-
gram. These data are recorded and allow the system
operation to be diagnosed. 4 coloured LEDs indicate
the operating condition of the compressor module.
The compressor module is part of the standard scope
of delivery of the compressor series HS.95, CS.105
and OS.95, and steplessly controls the capacity of
these compressors. For OS.85 compressors in ammo-
nia version, the CM-SW-01 can be delivered pre-in-
stalled as an option. It operates the 4-step capacity
control of this compressor series.
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 additional technical data, see
Reference Guide SG-150 and BEST SOFTWARE.

2 Safety

Compressor 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.
ST-150-3

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:
• 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.
3