Monitoring And Protective Functions; Oil Pressure Transmitter (B54); Rotation Direction Monitoring - Bitzer CM-SW-01 Information Technique

4.2 Monitoring and protective functions

The compressor module monitors the signals from sev-
eral sensors located on the compressor:
Monitored Com-
function pressor
Application lim- all
its:
Condensing
and evapora-
tion temperat-
ure
Low pressure all
High pressure all
Discharge gas HS./OS./
or oil temperat- CS.105
ure
Oil supply HS.95/
OS.95
OS.85
Minimum oil CS.105
level
Oil filter OS.85
Motor temper- HS./
ature CS.105
Rotation direc- HS./
tion and phase CS.105/
failure (OS.95/
OS.85)
Operating re- HS./
cognition mon- CS.105/
itoring with FI (OS.95/
operation OS.85)
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 cut
out 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 54. The module issues warnings when
the compressor starts too frequently or insufficiently un-
loaded, or when the minimum running time or minimum
shut-off period is not met.
40
Measuring sensor
Low pressure and high
pressure transmitters
(B51 and B50)
Low pressure transmit-
ter (B51)
High pressure transmit-
ter (B50)
Discharge gas/oil tem-
perature sensor (B02)
Opto-electronic oil mon-
itoring (B30)
Oil pressure transmitter
(B54, see below for de-
tails)
Oil supply monitoring
(B42)
Opto-electronic oil mon-
itoring (B30)
Oil differential pressure
(B41)
PTC sensors in motor
windings (B03..08)
Measuring cables on
the pins of the motor
power supply
Measuring cables on
the pins of the motor
power supply and auxil-
iary relay K18 at CN2:3
4.2.1

Oil pressure transmitter (B54)

For HS.95 compressors, this component is part of the
standard scope of delivery.
For OS.95, it is part of the standard scope of delivery
from serial number 1096901733. For previous models,
it can be retrofitted from serial number 1092401124
upon request.
4.2.2

Rotation direction monitoring

Rotation direction monitoring includes three functions:
• Rotation direction monitoring of the compressor start
• Phase failure monitoring of the motor power voltage
• Operating recognition monitoring when a delay
between the enable signal of the superior controller
and the start command takes place. This is the case
in FI operation.
Semi-hermetic compressors of series HS. and CS. are
delivered with fitted rotation direction monitoring. For FI
operation of open drive compressors, the cables must
be connected, see chapter Retrofitting a measuring
cable for rotation direction monitoring, page 53.
ST-150-4