Cutler-Hammer - Eaton Canada

Pre-Installation
INSTALLATION
Input Line Considerations
Input Line Routing
For 7.5 to 25 Hp AF93/IS903:
¥ If you use conduit - Use a separate
conduit for input line conductors and output
power conductors. Never route analog and
digital wiring from any equipment in the
same conduit as input or output power
wiring.
¥ If you use cable trays - Use a separate
cable tray for input line conductors and
output line conductors. Never route analog
and digital wiring from any equipment in
the same cable tray as input or output
power wiring.
For 2 to 5 Hp AF93/IS903:
If you use conduit, use separate conduit for
input and output power and AF93/IS903 control
wiring, up to the AF93/IS903 drive. At the drive
use a T-coupling to combine the input power and
output power wiring and attach to conduit entry
point.
Multiple Conductor Wiring
If multiconductor wiring is used, a separate
multiconductor cable must be used for the input
line wiring for each drive.
Line Fuses
Line fuses are intended to remove input line
voltage from the drive in the event of internal
component and drive failure. Line fuses must
not be used in place of branch circuit
overload protection.
CT (Current Transformer)
On 2 Hp, 3 Hp, and 5 Hp units manufactured
prior to May 2, 1996 and 7.5 and 10 Hp units
manufactured prior to July 1, 1996, a CT was
supplied internal to the drive for ground fault
protection. On units manufactured after these
dates, the ground fault protection is built into the
transistor module. If your drive contains a CT to
provide ground fault protection, input lines L1,
AF93/IS903 Instruction Manual
2-12
L2, and L3 must pass through the CT when you
are installing the input lines (See 5 and 10 Hp
connection drawings):
1. Remove the foam packing.
2. Pass L1, L2, and L3 through the knockout
and current transformer and then connect
them to terminals L1, L2, and L3,
respectively.
3. DO NOT pass any ground lines through the
current transformer.
4. The current transformer is connected to the
logic board at the factory.
AF93/IS903 Circuit Breaker
This option is used as a mechanical means of
disconnecting output power to the motor.
AF93/IS903 circuit breakers must not be used
in place of branch circuit overload
protection.
Isolation Transformers
Isolation transformers can be used with
AF93/IS903 Adjustable Frequency Drives.
Remember that the input line impedance must
be at least 1% and not over 5% with the drive
running. See the previous discussion on Input
Line Impedance.
Power Factor Correction
The displacement power factor at the input
terminals of an AF93/IS903 drive is
approximately 0.95 at all operating speeds and
loads. Therefore, power factor correction
capacitors are not required and should not be
installed. If capacitors for correcting the power
factor of other equipment are installed too close
to the drive, there may be an undesirable
interaction between the capacitors and the drive.
Standby Power Generation
Three phase standby power generators can be
used with AF93/IS903 Adjustable Frequency
Drives as long as the input line impedance is
within the 1% to 5% range.