Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 9)

Table of Contents vii
7000 “C” Frame 7000L-UM300I-EN-P – June 2013
Chapter 5 Functional Description
Introduction .............................................................................. 5-1
Description of Operation ......................................................... 5-2
Speed Command ...................................................................... 5-3
Speed Reference ..................................................................... 5-4
Speed Control ......................................................................... 5-6
Flux Control ............................................................................. 5-8
Flux Control for Synchronous Motor .................................... 5-10
Current Control ...................................................................... 5-12
Line Converter Feedback ....................................................... 5-14
Machine Converter Feedback ................................................ 5-15
Motor Model .......................................................................... 5-16
Line/Machine Converter Protection ....................................... 5-18
Power Semiconductor Diagnostics ........................................ 5-19
Off-line Detection of Failed SCRs/SGCTs ..................... 5-20
On-line Detection of Failed SCRs/SGCTs ..................... 5-23
Test Modes ............................................................................. 5-24
Flying Start (Induction Motor) .............................................. 5-26
Flying Start (Synch Motor) .................................................... 5-28
Tachometer/Encoder Option .................................................. 5-28
Synchronous Transfer ............................................................ 5-29
Transfer to Bypass ........................................................... 5-31
Transfer to Drive ............................................................. 5-34
Analog Outputs ..................................................................... 5-35
Control and Cabling Cabinet showing LV Control Panel ........ 6-1
PWM Control and Cabling Cabinet .......................................... 6-2
18-pulse Control and Cabling Cabinet ...................................... 6-3
Voltage-Sensing Assembly ...................................................... 6-4
Voltage-Sensing Circuit Board Assembly Replacement ......... 6-5
Transient Suppression Network – TSN ................................... 6-6
MOV Suppressor ............................................................... 6-6
MOV Fuse ......................................................................... 6-7
Transient Suppression Network Fuse Replacement .......... 6-8
Metal-Oxide Varistor Replacement ................................ 6-10
Grounding Network Capacitor Replacement .................. 6-10
Ground Filter Replacement .................................................... 6-13
Hall Effect Sensor Replacement ............................................ 6-14
Current Transformer Replacement ........................................ 6-15
Filter Capacitors Cabinet ....................................................... 6-16
Filter Capacitors .............................................................. 6-16
Filter Capacitor Replacement .......................................... 6-17
Testing Filter Capacitors .................................................. 6-18
Converter Cabinet Components ............................................. 6-20
Converter Cabinet ................................................................... 6-21
PowerCage™ ......................................................................... 6-21
SGCT and Snubber Circuit .................................................... 6-24
Checking Clamping Pressure ................................................. 6-25
Chapter 6 Component Definition
and Maintenance