Rockwell Automation WebPak 3000 DC Drives Hardware Reference, Installation and Troubleshooting - Manual (Page 20)

2-8 WebPak 3000 DC Drive Hardware Reference
2.2 Install a Line Reactor or Transformer for Input Power Conditioning
ATTENTION: Distribution system capacity above the maximum permitted system
kVA, as well as limitation of commutation notches, requires always adding an
impedance at line input (terminals 1U, 1V, 1W).You can use a 3-phase line reactor
with 2% voltage drop minimum (refer to Table 5.6) or other means of adding similar
impedance (e.g. matched isolation or auto transformer).
If an input transformer is installed ahead of the drive, a power disconnecting device
must be installed between the power line and the primary of the transformer. If this
power disconnecting device is a circuit breaker, the circuit breaker trip rating must
be coordinated with the inrush current (10 to 12 times full-load current) of the input
transformer. Failure to observe these precautions could result in damage to, or
destruction of, the equipment.
ATTENTION: Connection of a drive to a transformer with a primary rating of 2300
VAC or more may require additional input line conditioning. Contact your local
Rockwell Automation sales/service office for assistance when this is required.
Failure to observe this precaution could result in damage to, or destruction of, the
equipment.
The star point of the external AC-line transformer must always be grounded (Zero
potential) and connected to the drive ground point (terminal PE or ground stud).
Input transformers step up or step down input voltage and can be either auto or isolation
transformer types. Users should consider using an isolation transformer instead of an auto
transformer for the following advantages:
• AC power line disturbances and transients are minimized by an isolation transformer, thus
reducing or eliminating possible damage to solid state components.
• An isolation transformer provides electrical isolation for the drive from plant power system
grounds. Damaging currents may be avoided in instances where the DC output is
accidentally grounded or where the DC motor circuits are grounded.
Rockwell Automation offers a series of isolation transformers suitable for use with the drive.
2.3 Install an Input Disconnect
ATTENTION: .The standard EN 60204-1 requires that an input disconnect must be
provided in the incoming power line and either be located within sight of the drive or
have provisions for a padlock. Install an input disconnect in the incoming power line
that is located in sight of the drive or one that has provisions for a padlock. Failure
to observe this precaution could result in severe bodily injury or loss of life.
Any fused disconnect or circuit breaker in the incoming AC line must accommodate a maximum
symmetrical AC fault current as indicated in A.1 of this instruction manual. Size the disconnect
to handle the transformer primary current as well as any additional loads the disconnect may
supply.
1. Install an input disconnect in the incoming power line according to the standard EN 60204-1
if not provided with the drive.
The disconnect switch should be within clear view of machine operator and maintenance
personnel for easy access and safety. An open-type switch with provisions for a padlock is
recommended.
2. Wire this disconnect in the primary circuit of the drive isolation transformer (if used).