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Power supply and wiring, Warning – ITT S-DRIVE IM213 User Manual

Page 10

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10

WARNING

Hazardous

voltage

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

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.