
RWH ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.620-IOM (DEC 12)
Page 34
PRESSURE TRANSDUCERS - REPLACEMENT
1.
Shut off control power.
2.
Close the applicable transducer isolation valve.
NOTICE
To change the discharge pressure transducer (PE-3), it
will be necessary to depressurize the entire compres-
sor package. Follow "General Instructions For Replacing
Compressor Unit Components" before going to step 3.
3.
Refer to the WIRING HARNESS section, External Transduc
ers for Board #1, to identify the wiring harness connectors.
4.
Loosen screw and disconnect wiring harness connector
from transducer.
5.
Unscrew the transducer using a wrench on the metal hex
at the base of the transducer.
DO NOT ATTEMPT TO LOOSEN
OR TIGHTEN TRANSDUCERS BY THEIR TOP CASING.
6.
Install new transducer.
7.
Reconnect the wiring harness to the transducer.
8.
Reopen the transducer isolation valve.
9.
Turn on control power.
NOTICE
The Pressure Transducer is factory set. If calibration
is required, refer to Amalog Calibration Instruction in
publication 090.020-M.
CAPACITY LINEAR TRANSMITTER -
SLIDE VALVE
REPLACEMENT
The Capacity Linear Transmitter is located on the end of the
compressor unload cylinder, see Figure 34.
The linear transmitter with hermetic enclosure is based on
the inductive measuring principle. It features removable
electronics (from the sensor well) eliminating the need to
evacuate the compressor for replacement. This type of trans
mitter is dedicated to capacity control and is not adjustable.
1.
Shut off control power.
2.
Remove DIN connector plug from transmitter.
3.
Loosen cap screws.
4.
Remove transmitter unit.
5.
Install new transmitter unit.
6.
Tighten cap screws.
7.
Apply DIN connector plug to transmitter.
8.
Turn on control power.
NOTICE
For calibration instructions, refer to Quantum
™
LX Op-
erator's Manual, 090.022-O.
END VIEW
DIN CONNECTOR
STAINLESS STEEL WELL
HEAT ISOLATOR
CAST ALUMINUM HOUSING
COMPRESSOR UNLOAD CYLINDER
SHADED AREA SHOWS
CAPACITY LINEAR TRANSMITTER
Figure 34 - Capacity Linear Transmitter
TROUBLESHOOTING THE SENSOR
Ensure that the channel is properly configured on the Cali
bration or Analog board setup screen for the type sensor
being used.
Check that supply voltage to the sensor is 12 15 VDC on
red and black wire for Channel 14, P7A terminal strip of the
Analog Board.
Check for a returning signal of:
•
15 VDC for a transducer
•
420mA for a linear transmitter
•
05 VDC for a Potentiometer
•
.273 mA for an ICTD at 0C or ice water
VOLUME RATIO CONTROL TRANSMITTER -
SLIDE STOP
TROUBLESHOOTING
Confirm the setup of channel 15 on the calibration or analog
board #1 setup screen.
Troubleshoot the slide stop linear transmitter on channel 15
of the P7B terminal strip of the analog board in the same
manner as the slide valve transmitter.
REPLACEMENT
The Volume Ratio Control Transmitter is located on the right
side of the compressor (facing the shaft) at the inlet end.
See Figure 35.
The linear transmitter with hermetic enclosure is based on
the inductive measuring principle. It features removable
electronics (from the sensor well) eliminating the need to
evacuate the compressor for replacement. This type of
transmitter is dedicated to volume ratio control and has no
user adjustments.
1.
Shut off control power.
2.
Remove DIN connector plug from transmitter.
3.
Loosen set screws.
4.
Remove transmitter unit.
5.
Install new transmitter unit.
Содержание Frick 1179
Страница 36: ...RWH ROTARY SCREW COMPRESSOR UNITS MAINTENANCE 070 620 IOM DEC 12 Page 36 Figure 37 OIL LEVEL TRANSMITTER ...
Страница 41: ...RWH ROTARY SCREW COMPRESSOR UNITS MAINTENANCE 070 620 IOM DEC 12 Page 41 COMPRESSOR PORT LOCATIONS 408 MM ...
Страница 51: ...RWH ROTARY SCREW COMPRESSOR UNITS MAINTENANCE 070 620 IOM DEC 12 Page 51 OPERATING LOG SHEET ...
Страница 62: ...RWH ROTARY SCREW COMPRESSOR UNITS NOTES 070 620 IOM DEC 12 Page 62 ...
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