Frick SGXH-4021 - Coupling Alignment Requirements (Foot Mounted Only); Dehydration; Evacuation Test; Electrical Installation; Slide Stop Transmitter

070.650-IOM (JUL 19)
Page 31
SGC/SGX ROTARY SCREW COMPRESSOR
INSTALLATION
ELECTRICAL INSTALLATION
SLIDE STOP TRANSMITTER
The slide stop transmitter (Figure 21) measures the position
of the slide stop (SS) using a 20 to 4 mA signal to cover
the range of minimum to maximum Vi. The signal is sent
to your control system so that it can adjust the position of
SS according to system pressures. The correct SS position
is important to achieve the most efcient compressor
operation. Connect to +/- and signal as shown in the wiring
diagram in Figure 22. Refer to FRICK Compressor Control
Panel 090.040-O for instructions for calibration procedure.
Figure 21: Slide stop transmitter
Figure 22: Wiring diagram for slide stop transmitter
CAPACITY SLIDE VALVE TRANSMITTER
The slide valve transmitter (Figure 23) measures the position
of the slide valve (SV) and sends a 4 to 20mA signal to your
control system. The controller adjusts the position of the SV
according to the motor load set point. The correct position
is important to properly load the compressor and motor.
It is important not to overload the compressor and motor.
Observe the maximum power input and ensure design
limitations are not exceeded. Connect to +/- and signal as
shown in the wiring diagram, Figure 24. Refer to 090.040-
O - FRICK Compressor Control Panel for instructions for
calibration procedure.
the mount is machined to ensure that motor to compressor
alignment is in specication (see the Motor mounting
section for mounting details).
If you are using a foot mounted motor, it is essential that
the coupling be properly aligned to ensure proper bearing
and seal performance.
1. Coupling must be selected and installed so that it
doesn’t transmit any axial load to the compressor shaft.
Set magnetic center correctly on the sleeve bearing
motors.
2. Set up the minimum distance between compressor
shaft and motor shaft to allow for seal removal (see
Outline drawings).
3. Coupling must be able to take up any misalignment
between motor and compressor. It is critical to the
life of the shaft seal that misalignment is kept to the
minimum possible value. Be sure to follow the coupling
manufacturer’s guidelines for checking and correcting
any misalignment. See the Operation section for
Johnson Controls–FRICK requirements.
COUPLING ALIGNMENT REQUIREMENTS
(FOOT MOUNTED ONLY)
Coupling alignment must be performed prior to start-
up. After the compressor has been installed on the job
site, alignment must be checked again and if necessary
corrected prior to start-up. After a few hours of operation,
the alignment must be checked while the package is still
hot. Correct hot alignment is critical to ensure the life of the
shaft seal and compressor bearings.
Maximum radial runout is .004 in. total indicator reading.
Maximum axial runout is .004 in. total indicator reading.
A dial indicator or another appropriate measuring device is
to be used to determine the Total Indicator Runout.
Indicator bracket sag must be checked as all brackets have
someexibility.Thebestwaytomeasurethisistoattach
the dial indicator and bracket on a pipe at the coupling span
distance. Zero the indicator in the 12:00 position, and rotate
the pipe so the indicator is in the 6:00 position. The reading
on the indicator in the 6:00 position is the bracket sag. This
value must be included in the dial indicator readings when
afxedtothecouplingforanaccuratealignment.
DEHYDRATION / EVACUATION TEST
Evacuate the system to 1000 microns. Valve off the vacuum
pump and hold vacuum for 60 minutes.
Pass – Vacuum cannot rise more than 500 microns during
the hold period.
Fail – Vacuum rise is more than 500 microns during the
hold period. Identify and repair any system leaks.
Repeat vacuum test until requirements are met.