Power Supply and Wiring

Section 6 (continued)

Delta/Delta with grounded leg

Another common configuration providing voltage rebalancing with no phase shift between input and output. Again, depending on the output connections from the drive to motor, the grounded neutral may be a path for common mode current caused by the drive output.

Ungrounded secondary

Grounding of the transformer secondary is essential to the safety of personnel as well as the safe operation of the drive. Leaving the secondary floating can permit dangerously high voltages between the chassis of the drive and the internal power structure components. In many cases this voltage could exceed the rating of the EMC filter and input MOV protection devices of the drive causing a catastrophic failure. In all cases, the input power to the drive should be referenced to ground. If the transformer can not be grounded, then an isolation transformer must be installed with the secondary of the transformer grounded.

Warning

WARNING

Hazardous voltage

If a power system with an ungrounded secondary is used, the line to ground EMC filter components and line to ground MOV protection must be disconnected or damage to the controller can result.

To remove the line to ground EMC filter components, locate the jumper shown below. The jumper is on the left hand side of the controller on the main board. Move to the disconnected position shown below.

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ITT IM213 manual Delta/Delta with grounded leg, Ungrounded secondary

IM213 specifications

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