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Drives

Bulletin 1336Z AC

1336Z SPIDER drives are suitable for use on a circuit capable of delivering up to a maximum of 200,000 rms symmetrical amperes, 600 volts.

Unbalanced Distribution Systems

This drive is designed to operate on earthed-neutral, three-phase supply systems whose line voltages are symmetrical. 240V AC drives may be operated with one phase referenced to ground.

Ungrounded Distribution Systems

1336Z SPIDER drives are not designed to operate in ungrounded systems.

Input Power Conditioning

In general, the 1336Z SPIDER is suitable for direct connection to an AC line of the correct voltage. Certain conditions can exist, however, that prompt consideration of a line reactor or isolation transformer ahead of the drive.

The basic rules to aid in determining whether a line reactor or isolation transformer should be considered are as follows:

• If the AC source experiences frequent power outages or significant voltage transients, users should calculate the source transformer VA. If the source transformer VA exceeds the VAmax (1MVA) and the drive is installed close to the source, it is an indication that there may be enough energy behind these voltage transients to cause nuisance input fuse blowing, overvoltage faults or drive power structure damage. In these cases, a line reactor or isolation transformer should be considered.
• If the AC source does not have a neutral or one phase referenced to ground (see Unbalanced Distribution Systems), an isolation transformer with the neutral of the secondary grounded is required. If the line-to-ground voltages on any phase can exceed 125% of the nominal line-to-line voltage, an isolation transformer with the neutral of the secondary grounded, is highly recommended.
• If the AC line supplying the drive has power factor correction capacitors that are switched in and out, an isolation transformer or 5% line reactor is recommended between the drive and capacitors. If the capacitors are permanently connected and not switched, the general rules above apply.