Electrical Conduits; Wiring Diagram Options; Motor Thermistor Protection - Johnson Controls Frick vyper VYA PG -46 Service Manual

cutout on the back wall of the Vyper
Output power connections should be tightened as shown in
the table. An appropriate conduit must be connected to the
back cutout fl ange of the cabinet for proper installation. These
connections are made in the factory and will be pretested
before shipment. Generally, an additional dV/dt "snubber"
fi lter is not required for package-mounted units.
Figure 14 - Power out connection point
Output Power Lead Torque Requirement
(Package-Mounted Vyper
Connector Size Termination
3/8" lug Compression

ELECTRICAL CONDUITS

• All power wiring must be contained in metallic conduit.
• All compressor motor wiring must be in a separate metallic
conduit.
Figure 16
VYPER VARIABLE SPEED DRIVE
™
INSTALLATION
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cabinet (See Figure 15).
™ )
Torque
216-240 in-lb

MOTOR THERMISTOR PROTECTION

• Oil pump motor wiring must be in a separate metallic
conduit.
• Compressor motor cooling fan power must be in a separate
metallic conduit.
• Control wiring between the Quantum
Vyper ™ must be contained in separate metallic conduit.
• Analog wiring needs to be in separate metallic conduit.
Figure 15 - Back wall power connections

WIRING DIAGRAM OPTIONS

The National Electrical Code requires thermal protection for
motors operating with variable-speed drive systems. Frick
employs two types of thermal protection for motors. One
method uses thermistors, and one method uses RTDs. Fig-
ures 16 - 21 show the wiring scheme for both options.
S100-200 IOM (MAY 08)
Page 21
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LX panel and the