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The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office.
Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2015 Johnson Controls, Inc. www.johnsoncontrols.com
R-142
Code No. LIT-1900956
VFD68BBB Variable Frequency Drive
VFD68 Variable Frequency Drives
Motor Speed Controls
Description
The VFD68 Variable Frequency Drive
provides three-phase motor speed control in a
variety of HVAC/R applications. The
VFD68 drive is designed primarily for
condenser fan speed control on HVAC and
refrigeration condensing units, but can also be
set up to control a variety of pumps, blowers,
and fans.
The VFD68 drive accepts an input signal from
P499 Electronic Pressure Transducer, or
other devices that provide a 0 to 5 VDC,
0 to 10 VDC, or 4 to 20 mA signal.
The application-specific design of the VFD68
drive provides a simple interface, which makes
the drive easy to understand and operate.
You can quickly and easily reconfigure the
VFD68 drive to control variable speed pumps
in cooling and heating applications, or to
control variable speed supply fans in VAV
applications.
The VFD68 drive is an
RS485, RTU-compliant
ModBus® slave device and can be integrated
into a ModBus network.
Refer to the VFD68 Variable Frequency Drives
Product Bulletin (LIT-12012068) for important
product application information.
Features
• Selectable input types allows use with
0 to 5 VDC (ratiometric), 0 to 10 VDC, or
4 to 20 mA input signals from transducers,
sensors, and controllers.
• High input signal selection of two similar
inputs (230 or 460 volt models only)
provides fan speed control of dual circuit
condensing units, based on the highest
pressure circuit.
• Compact design provides for easy and
flexible installation.
• Three-phase, 230, 460, or 575 VAC
models can control a wide variety of
three-phase motors ranging up to 10hp.
• Simple and advanced end-user settings
provide quick and simple application setup
and operation, as well as advanced setup
parameters for custom applications.
A VFD68 drive can control multiple motors
wired in parallel; however, the sum of the Full
Load Amperes (FLA) ratings for the motors
must not exceed the maximum output current
rating of the VFD68 drive, including any
de-rating due to altitude, temperature, or a
combination of both.
Repair Information
If the VFD68 Variable Frequency Drive fails to
operate within its specifications, replace the
unit. For a replacement VFD68 Drive, contact
the nearest Johnson Controls®
representative.
IMPORTANT: Do not control both
single-phase and three-phase motors with
the same VFD68 drive.
Applications
The VFD68 drive accepts input signals from a
variety of pressure transducers, temperature
sensors, and low-voltage controllers to
provide continuous response to changing
condenser load conditions.
The VFD68 drive allows the system to:
• maintain optimum condenser head
pressure
• operate in low ambient temperature
conditions down to -40ºC (-40ºF)
• reduce short-cycling, which occurs when
using
• use On/Off fan controls
• maintain a more stable evaporator
temperature
• operate more efficiently, reducing
electricity cost.
The VFD68 drive can also:
• help optimize compressor operation,
reduce wear, and extend compressor life
by stabilizing the condenser head
pressures
• reduce motor repair and replacement costs
by eliminating the condenser fan
short-cycling
• extend refrigerated product life and provide
more consistent comfort cooling by
stabilizing evaporator temperatures
Selecting a Motor
Motors used with the VFD68 drive must:
• be AC induction three-phase motors that
are UL Recognized and CSA Certified, or
equivalent
• be rated for: 230 VAC at 50/60 Hz;
460 VAC at 50/60 Hz; or 575 VAC at 60 Hz
• have an Inverter Rating (460 VAC motors)
• have Insulation Class F or better
The VFD68 drive is intended for use with
variable speed motors that are rated for 40:1
operation.
IMPORTANT: When selecting the motor,
do not exceed the maximum output current
rating of the VFD68 drive