Installation Guide 5
Issue Number: 2 www.johnsoncontrols.com
Safety information
Rating data Mechanical installation Electrical installation Operation Technical specifications UL listing information
1.6 Motor
Ensure the motor is installed in accordance with the manufacturer's recommendations.
Ensure the motor shaft is not exposed.
Standard squirrel cage induction motors are designed for single speed operation. If it is intended to
use the capability of a drive to run a motor at speeds above its designed maximum, it is strongly
recommended that the motor manufacturer is consulted first.
Self ventilated induction motors may overheat at low speeds since the effectiveness of the fan is
reduced. If necessary, an electric force vent fan should be used.
1.7 Electrical installation
1.7.1 Electric shock risk
The voltages present in the following locations can cause severe electric shock and may be lethal:
• AC supply cables and connections
• Output cables and connections
• Many internal parts of the drive
Unless otherwise indicated, control terminals are single insulated and must not be touched.
1.7.2 Isolation device
The AC supply must be disconnected from the drive using an approved isolation device before any
cover is removed from the drive or before any servicing work is performed.
1.8 Stored charge
The drive contains capacitors that remain charged to a potentially lethal voltage after the AC supply
has been disconnected. If the drive has been energized, the AC supply must be isolated at least
ten minutes before work may continue.
Normally, the capacitors are discharged by an internal resistor. Under certain, unusual fault
conditions, it is possible that the capacitors may fail to discharge, or be prevented from being
discharged by a voltage applied to the output terminals. In this case, consult Johnson Controls or
their authorized distributor.
1.9 Ground leakage current
The drive is supplied with an internal EMC filter capacitor installed. If the input voltage to the drive is
supplied through a GFCI, these may trip due to the ground leakage current. See “Removing the
internal EMC filter” on page 13 for more information and how to disconnect the internal EMC
capacitor.
The VFD66 series variable speed drives are intended to control equipment under normal
operating conditions. Where failure or malfunction of a VFD66 drive could lead to an
abnormal operating condition that could cause personal injury or damage to the
equipment or other property, other devices, (limit or safety controls) or systems (alarm or
supervisory) intended to warn of, or protect against, failure or malfunction of the VFD66
drive must be incorporated into and maintained as part of the control system.
Risk of thermal damage
The VFD66 control can generate and dissipate significant heat. Mount the control on a
metal, concrete, or cinderblock mounting surface. Mounting the VFD66 control on
surfaces made of wood or other heat-sensitive material may result in damage to the
mounting surface.
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