Rockwell Automation 7763 Medium Voltage OneGear SMC Flex Motor Controller (10-15 kV) - Manual (Page 107)

Rockwell Automation Publication 7760-UM001D-EN-P - October 2014 107
Troubleshooting Chapter 8
Figure 45 - Current Loop Power Supply
The current loop power supply provides a current of 40…50 A AC to each SCR
power module phase assembly. If this current is not detected and fed back to the
interface boards, stop maneuvers will not function (and an Alarm will be
generated).
Circuit Board Replacement The replacement of printed circuit boards is straightforward, however, there are a
number of precautions which must be considered when handling the boards.
1. Remove all power from the equipment.
2. Carefully detach all wires, cables and connectors, noting their location and
orientation. For the interface board, remove the control module.
Current Loop
Transformer
Current Transformer
Transformer Guard
Ground Wire
180Ω, .6 Watt Resistor
ATTENTION: Some circuit boards may contain CMOS components which can be
destroyed by static charges generated by friction of materials made with
synthetic fibres. Use of damaged circuit boards may also damage related
components. A grounding wrist strap is recommended for handling sensitive
circuit boards.
ATTENTION: To avoid shock hazard, ensure the main power has been
disconnected before working on the controller, motor or control devices. Verify
that all circuits are voltage free using a hot stick or appropriate voltage
measuring device. Failure to do so may result in burns, injury or death.