ITT S-DRIVE IM213 - Manual (Page 9)

9
WARNING
Hazardous
voltage
Mounting the Controller
Section 5
(continued)
Note
Do not block the heat sink (fins) and fans and do not set anything on the units.
Warning
The controller access cover should always be securely fastened to the control box due
to the dangerous voltage/shock hazard inside the unit. A lock can be used to prevent
unwanted entry.
Power Supply and Wiring
Section 6
Power Supply
Note
Installation and maintenance MUST be performed by properly trained and qualified personnel.
Always follow the National Electrical Code (NEC) or Canadian Electric Code (CEC), as well as all
state, local and provincial codes when wiring the system.
The type of transformer and the connection configuration feeding a drive plays an important role in its performance
and safety. The following is a brief description of some of the more common configurations and a discussion of their
virtues and shortcomings. Always ask what type of power system the site has before sizing the drive.
Delta/Wye with grounded Wye neutral
This configuration is one of if not the most common. It provides rebalancing of unbalanced voltage with a 30
degree phase shift. 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.