ST-150-4
40
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 lim-
its:
Condensing
and evapora-
tion temperat-
ure
all
Low pressure and high
pressure transmitters
(B51 and B50)
Low pressure
all
Low pressure transmit-
ter (B51)
High pressure
all
High pressure transmit-
ter (B50)
Discharge gas
or oil temperat-
ure
HS./OS./
CS.105
Discharge gas/oil tem-
perature sensor (B02)
Oil supply
HS.95/
OS.95
Opto-electronic oil mon-
itoring (B30)
Oil pressure transmitter
(B54, see below for de-
tails)
OS.85
Oil supply monitoring
(B42)
Minimum oil
level
CS.105
Opto-electronic oil mon-
itoring (B30)
Oil filter
OS.85
Oil differential pressure
(B41)
Motor temper-
ature
HS./
CS.105
PTC sensors in motor
windings (B03..08)
Rotation direc-
tion and phase
failure
HS./
CS.105/
(OS.95/
OS.85)
Measuring cables on
the pins of the motor
power supply
Operating re-
cognition mon-
itoring with FI
operation
HS./
CS.105/
(OS.95/
OS.85)
Measuring cables on
the pins of the motor
power supply and auxil-
iary relay K18 at CN2:3
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.
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.
