VYPER
™
VARIABLE SPEED DRIVE
INSTALLATION
S100-200 IOM (MAY 08)
Page 5
GENERAL DESCRIPTION
The Vyper
™
serves as the motor starter and capacity control
for a Frick screw compressor. It controls capacity by reducing
compressor speed and optimizing the compressor effi ciency
at all loads.
The Vyper
™
varies the screw compressor speed by control-
ling the frequency and voltage of electrical power supplied
to the compressor motor. Unlike general purpose variable
speed drive units, the Vyper
™
is factory calibrated for maxi-
mum performance with Frick screw compressors. Because
of the specifi c application to commercial building systems,
the Vyper
™
has been designed to be electronically compat-
ible with other electronic equipment that typically operates
in the same facility.
The Vyper
™
can be cooled by two coolants: water or Glycol.
Both coolants can be used with either package mounted or
remotely mounted Vyper
™
units. Power wiring and some pip-
ing between the facility and Vyper
™
must be fi eld supplied.
ELECTRICAL LIMITS
Frequency Supply Voltages VAC
60 Hz 440/460/480
50Hz 380
Supply voltage to the Vyper
™
must be 440/460/480V @ 60 Hz
or 380V @ 50 Hz. If a building has higher or lower supply volt-
age, consider a step-up or step-down transformer. Extreme
operating voltage ranges from a minimum of 414 VAC to a
maximum of 508 VAC , 3-phase, 60 Hz, or 342 to 423 VAC,
50 Hz. The maximum allowable voltage unbalance is 3%. The
main transformer should be sized so that the transformer
voltage does not sag more than 5% when subjected to load
excursions. The steady-state operating voltage should be
within the range of 414 to 508 VAC, 3 phase, 60 Hz, or 342
to 423 VAC, 3 phase, 50 Hz.
Frequency
Operating Voltage Limits
Phase
Min Max
60 Hz 414 508 3
50 Hz 342 423 3
Frequency Minimum Voltage Limits VAC
60 Hz 391
50 Hz 340
Unit controls may shut down with power interruptions up to
one cycle. Interruptions greater than one cycle will result in
a shutdown. A voltage dip below 391V, 60 Hz or 340V, 50 Hz
constitutes a power interruption.
CURRENT LIMITS
HP Freq Voltage RMS current LRA max
437 HP 60 Hz 460V 565A 3810A
362 HP 50 Hz 400V 565A 3895A
305 HP 60 Hz 460V 380A 2598A
254 HP 50 Hz 400V 380A 2727A
The drive is capable of outputting the rated full load cur-
rent over the operating frequency range of the drive. The
unit is started with the compressor fully unloaded until the
frequency reaches the minimum operating frequency range.
In addition, the drive is capable of operating without a load
for ease of service.
• Overload: 105% of full load for 7 seconds.
• Effi ciency: 98% Typical at rated load and frequency.
INPUT SHORT CIRCUIT LIMITS
The Vyper
™
can be affected by specifi c events, which can
decrease product life, and cause component damage related
to the input power conditioning.
• The power source experiences interruptions.
• The power system has power factor correction capacitors
switched in and out of the system by either the power
supplier or the end user.
• The power source contains voltage spikes which could be
caused by equipment on the same line or natural phenom-
ena such as electrical storms.
If one or more of these conditions exist it is recommended
that the end user install minimum impedance between the
Vyper
™
and the power source. A transformer or other similar
device can supply the impedance.
Horsepower Circuit Breaker Rating (Amps)
305 / 254 400
437 / 362 600
Horsepower Input Short Circuit Rating
305 / 254 65,000 Amps @ 480 Volts
437 / 362 100,000 Amps @ 480 Volts
Drive Size Circuit Breaker Lug Sizes
305 / 254 HP 2/0 to 350 KCMIL per phase
437 / 362 HP
400 to 500 KCMIL per phase or
3/0 to 350 KCMIL per phase
A 100% rated input power circuit breaker with ground fault
protection sized by the National Electrical Code or UL require-
ments with external lockable operator is supplied as standard.
The circuit breaker is rated at 400A for 305 / 254 HP units
and 600A for 437 / 362 HP units. The maximum per phase
Total Harmonic Distortion of the input current shall not exceed
30% at 100% rated power. The Frick
®
Vyper
™
drive typically
produces between 20-30% THD.
An IEEE 519 Harmonic Filter is required if the THD of the input
current at the installation cannot exceed 8%. The IEEE 519
Harmonic Filter is highly recommended for crucial applications
such as hospitals, computer networks, airports, etc.
ENVIRONMENT
The Vyper
™
is housed in a NEMA 4 indoor class enclosure.
The electronics are sealed against ambient conditions,
however it is recommended that the end user employ good
standard practices in regard to moisture exposure and ex-
treme temperature conditions. It is recommended that the
Vyper
™
be operated within the temperature range of 40°F
and 135°F.
Recommended Temperature Limits (°F)
Min Max
Storage -4 158
Operating 40 135
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