Cutler-Hammer - Eaton Canada

Pre-Installation
INSTALLATION
Application Considerations
When you plan your AF93/IS903 Adjustable
Frequency Drive installation, consider its
application. Different applications, such as
industrial process control and HVAC system
control, require different drive options, motors
and software configuration.
The following is a list of items you should keep in
mind when you plan the installation and order
the materials. It is important to note that some of
the options available for your drive must be
installed at the factory.
AF93/IS903 Options
1. Remember you must have an input line
impedance of at least 1% and not over 5%
for proper drive operation. You should
calculate the input line impedance to
determine whether a 1% input reactor is
required. Refer to the discussion on Input
Line Considerations later in this section for
more details on determining input line
impedance.
2. Order a 3% or 5% input line reactor to
correct input line harmonic distortions as
required. Refer to the discussion on Input
Line Characteristics on later in this section
for more details for more details on harmonic
distortions.
AF93/IS903 Instruction Manual
2-6
3. An AF93/IS903 circuit breaker is a lockable
means for disconnecting the motor from the
power source. The circuit breaker is
mounted in an optional NEMA 1 or 12
enclosure or MCC.