VYPER
™
VARIABLE SPEED DRIVE
INSTALLATION
100-200 IOM (FEB 09)
Page 19
PACKAGE-MOUNTED VYPER
™
The package-mounted version of the Frick Vyper
™
performs
identically to the remote-mounted versions. One advantage of
the package mounted version is that all electrical connections
have been prewired and tested at the factory which ensures
proper installation of control and power lines. In addition, the
package-mounted Vyper
™
does not require an additional
dV/dt filter between the FVS cabinet and the motor. Package
mounting is available for both 305 / 254 HP and 437 / 362 HP
versions. Both water or glycol connections are possible and
the optional IEEE 519 harmonic filter is also available. The
illustration below shows a 437 HP Vyper
™
cabinet mounted on
a Frick RWF II 134 refrigeration package. Individual systems
configurations will vary according to model and horsepower
sizes selected.
The Vyper
™
cabinet is mounted on a rectangular welded
steel channel, which provides both an attachment point for
the cabinet’s side brackets, and also helps to maintain the
rigidity of the cabinet during service. The channel assembly
/ VSD cabinet is mounted on two extension brackets welded
to pads on the system’s oil separator. All package-mounted
units are assembled with vibration isolators located between
the Vyper
™
channel frame and the extension mounting brack-
ets. The isolators help to minimize the exposure of internal
components and connections to cyclic vibrations during
shipping and operation.
Power supply to the motor is made via a conduit exit from
a rear panel in the Vyper
™
Cabinet. Control wiring in/out is
located at the lower left side of the cabinet.
Drive Disconnect Height – covered under Exception 2,
section 8 of article 404 of the NEC, which states, Switches
and Circuit Breakers installed adjacent to motors, applianc-
es, or other equipment that they supply shall be permitted
to be located higher than 2.0 M (6 ft 7in) and to be acces-
sible by portable means.
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