Frick RWF II 100 User Manual

070.610-IOM (JUL 21)
Page 21
RWF II Rotary Screw Compressor Units
Installation
Communications
The use of communications such as serial and ethernet
in industrial environments are commonplace. The proper
installation of these networks is as important to the proper
operation of the communications as all of the preceding
practices are to the equipment.
Serial communications cable needs to be of the proper
gauge based on the total cable distance of the run.
Daisy-chaining is the only acceptable style of running the
communications cable. While Star Networks may use less
cable, they more often than not cause problems and inter-
ruptions in communications, due to varying impedances
over the varying lengths of cable. Ground or drain wires of
the communications cable are to be tied together at each
daisy-chain connection and only taken to ground in the
central control system panel.
It is important to carefully consider the type of cable to
be used. Just because a cable has the proper number of
conductors and is shielded does not mean it is an accept-
able cable. Johnson Controls-Frick recommends the use
of Belden #9829 for RS-422 communications and Belden #
9841 for RS-485 up to 2000 ft (600 m) total cable length.
Refer to Frick drawing 649D4743 for more detail
Comm Port Protection: Surge suppression for the comm
ports may not be the best method, since suppression
is required to divert excess voltage/current to ground.
Therefore, the success of these devices is dependent on a
good ground (covered earlier in this section). This excess
energy can be quite high and without a proper ground, it
will access the port and damage it.
Isolation or optical isolation is the preferred comm port
protection method. With optical isolation, there is no con-
tinuity between the communications cable and the comm
port. There is no dependence on the quality of the ground.
Be sure to know what the voltage isolation value of the
optical isolator is before selecting it. These may range
from 500 V to 4000 V.
Frick Optical Isolation Kits are offered under part number
639C0133G01. One kit is required per comm port.
NOTICE
It is very important to read the installation instructions thoroughly before begin-
ning the project. Make sure you have drawings and instructions for the equipment
being installed. If not, call the manufacturer to receive the proper instructions and
drawings. Every manufacturer of electronic equipment should have a knowledgeable
staff, willing to answer your questions or provide additional information. Following
correct wiring procedures will ensure proper installation and consequently, proper
operation of your electronic equipment.
UPS power and Quantum HD panels
Johnson Controls does not advise nor support the use
of uninterrupted power supply systems for use with the
Quantum
™
HD panel. With a UPS system providing shut-
down protection for a Frick Quantum panel, the panel may
not see the loss of the three-phase voltage on the motor
because the UPS may prevent the motor starter contactor
from dropping out. With the starter contactor still ener-
gized, the compressor auxiliary will continue to feed an
Okay signal to the Quantum
™
HD panel. This may allow
the motor to be subjected to the fault condition on the
three-phase bus.
A number of fault scenarios are:
• The three-phase bus has power On and Off in a
continuous cycle manner which may cause the motor
to overheat due to repeated excessive in-rush current
experiences.
• The motor cycling may damage the coupling or cause
other mechanical damage due to the repeated high
torque from rapid sequential motor bumps.
• Prolonged low voltage may cause the motor to stall
and possibly overheat before the motor contactor is
manually turned off.
Under normal conditions, the loss of three-phase power
will shut down the Quantum
™
HD panel and it will reboot
upon proper power return. If the panel was in Auto, it
will come back and return to running as programmed. If
the unit was in Remote, the external controller will re-
initialize the panel and proceed to run as required. If the
panel was in Manual mode, the compressor will have to
be restarted manually after the three-phase bus fault/in-
terruption has been cleared / restored.
If the local power distribution system is unstable or prone
to problems there are other recommendations to sat-
isfy these problems. If power spikes or low or high line
voltages are the problem, then a constant voltage (CV)
transformer with a noise suppression feature is recom-
mended. Johnson Controls, Inc. can provide these types of
transformers for this purpose. Contact Johnson Controls
for proper sizing (VA Rating) based on the requirement of
the job. If a phase loss occurs, then you will typically get
a high motor amp shutdown. If the problem continues,
an analysis of the facility’s power supply quality may be
necessary.

Frick RWF II 100 Specifications

General

Brand	Frick
Model	RWF II 100
Category	Compressor
Language	English