Frick Vyper 700 - Soft-Start Sequence; Interference with Electronic Equipment; Interfacing Electrical Equipment; System Operating Conditions

VYPER
™
VARIABLE SPEED DRIVE
INSTALLATION
100-210 IOM (JUL 09)
Page 25
SOFT-START SEQUENCE
NOTE: There is a thirty (30) second delay at initial start-up
to charge the capacitors of the Vyper
™
. This delay does
not occur in “Standby Mode”, only on initial start-up.
At start-up, both the motor and slide valve begin to load to a
preset value. The Frick slide valve will load to the “Minimum
Slide Valve Position” setpoint and the Vyper
™
will accelerate
to the speed corresponding to the “Minimum Drive Output”
setpoint. From this point, the slide valve position and motor
speed are controlled by the Capacity Control setpoints.
During start-up, the VSD varies the voltage and frequency
to maintain the same proportion that exists between the two
at design conditions. The required inrush current to start the
motor never exceeds the FLA rating of the given motor and is
typically only 10-20% of FLA. Mechanical forces on the motor
windings and motor heating are 20% to 50% lower than with
a mechanical starter. This results in less mechanical shock
to the system and longer motor life.
Refer to PROGRAMMING and VYPER
™
/QUANTUM
™
LX
COMMUNICATIONS Sections and Manual S90-020 O,
“Frick Quantum
™
LX Compressor Control Panel Opera-
tion-Basic” for additional operation details.
INTERFERENCE WITH ELECTRONIC
EQUIPMENT
RFI / EMI are acronyms for Radio Frequency Interference
and Electro-Magnetic Interference. Any electronic device
that switches currents at high speed is capable of generat-
ing RFI and EMI. Some typical sources are computers, light
dimmers, and motor speed controls. RFI refers to electrical
fields, which are transmitted through the air. EMI refers to
electrical currents, which are conducted in wiring connected
to the device.
The Vyper
™
generates both RFI and EMI. Most RFI energy
generated by Vyper
™
is contained within the Vyper
™
cabinet.
The EMI energy is conducted back in to the power line and
may be capable of causing interference to other electronic
equipment that is powered by the same electrical distribu-
tion system.
VSDs are used successfully in many installations, which uti-
lize sensitive electronic equipment. However, in some highly
sensitive cases, there may be electronic equipment that is
affected by Vyper
™
originated EMI. For those cases, Johnson
Controls-Frick recommends a Harmonic Filter to reduce
conducted EMI levels by reducing current harmonics to limits
defined by the IEEE 519-1992 standard. The filter is located
within the Vyper
™
cabinet and is factory installed and tested.
The filter can also be retrofitted to an existing Vyper
™
.
All hospital applications require the IEEE 519 harmonic filter
and is also strongly recommended for any installation with
sensitive electronic equipment connected to the electrical
distribution system. The filter is also required whenever a
local utility places a limit on current distortion for an electronic
device. Applications that need 8% or less total harmonic cur-
rent distortion require the IEEE 519 harmonic filter.
INTERFACING ELECTRICAL EQUIPMENT
There are many low-voltage DC signals in the Vyper
™
that
may be picked up from other electrical devices or wiring in
the vicinity of the Vyper
™
electronic controls. Use the follow-
ing guidelines to prevent the Vyper
™
electronic controls from
picking up low-voltage DC signals and possibly cause injury
or damage to the electronic controls:
• Never route non-VSD wiring through the Vyper
™
cabinet or tie in external equipment to the Vyper
™
control wiring in any way.
• NeverwireacontrolsystemtotheVyper
™
circuitry.
• Neveruse120VsupplytofeedtheVSDcontrolwiring.
The Vyper
™
has it’s own internal power supply. Using
an external power supply may damage the Vyper
™
and may also cause hazardous working conditions
for service and operating personnel.
SYSTEM OPERATING CONDITIONS
Refrigeration systems considered for Vyper
™
application
must be in good operating condition. A site survey should be
completed with the help of a trained Frick service technician.
The technician will review the condition of the equipment and
recommend actions that must be taken to ensure that the
equipment is in good operating condition. This survey must
be taken and required repairs made prior to the application
of the Vyper
™
.
PNEUMATIC CONTROLS
Pneumatic controls must be replaced with electronic controls
to be compatible with the Vyper
™
and the Quantum
™
LX
control panel.