VLT
®
MICRO
Installation Notes:
• Make sure that the appropriate input fusing with specified current ratings are
connected between the AC Power Line and the AC drive. A MCC (contactor with
magnetic trip) is recommended between the drive and circuit breaker to provide a
means to disconnect the drive from the power line in the event of a fault.
• Make sure that the leads are connected correctly and the drive is properly grounded.
(Ground leads should be at least as the same size as input terminals R, S and T.)
• Use ground leads that comply with AWG standards. Make the length of these ground
leads as short as possible.
• Should several units be installed side by side, all the units should be grounded directly
to the ground terminal. Do not form a loop with the ground leads.
• When the drive output terminals U, V, and W are connected to the motor terminals U,
V, and W, respectively, the motor will rotate counter-clockwise (viewed from the shaft
of the motor as shown above) when a forward operation command is received ( FWD
lamp is ON).
• Make sure that the power source supplies the correct voltage and is capable of
supplying the required current to the drive.
• When power is applied to the drive, the internal DC bus charge indicator LED will be
on.
• Do not attach or remove wiring or connectors when power is applied to the drive. Do
not attempt to probe signals on the circuit board while the drive is operating.
• For single phase applications, the AC input line can be connected to any two of the
three input terminals R, S, T. Note: The drive is not intended for use with single-phase
motors.
• To reverse the direction of rotation, interchange the connection of any of the two
motor leads.
• Do not connect the AC input to any of the U, V, W terminals, as this will damage the
drive.
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