User`s manual

CHAPTER 5.0 Functional Overview 5-2
CDS7324 (FORMERLY LSF-0819)
Rev. A INSTALLATION & USER’S MANUAL
5.3 Power Interface Section
5.3.1 High Power Section Description
The high power supply section has the following features:
 Three Phase a.c Operation
 Direct Off-Line 230 V r.m.s to 460V r.m.s. +10% Operation
 Soft Start (a.c. Inrush Current Limiting)
 Input MOV Transient Protection
 Internal Regeneration capability (µA and A units only)
 Drive Ready Relay
 Provision for External Regeneration Resistor
 Integral Heat Sink and Cooling Fans
 24V Logic Backup (mandatory on µA size units)
These features are described in the next sections.
The high power supply section may be divided into functional blocks:
• High voltage rectification and filtering
• Soft-start of a.c. mains power-on
• Low voltage control power supply
• Regeneration circuit
• Monitoring and fault logic circuits
WARNING - The high power section contains large capacitors that maintain high voltage on the
DC+ to DC- terminals for several minutes after input power is removed, if the regeneration circuit
is not operating normally. Wait at least 5 minutes for the µA sizes (6 minutes for the A-E sizes)
after power shutdown for capacitors to discharge. Then use a voltmeter to check for safe voltage
from the DC+ terminal to the DC- terminal before contacting terminals or commencing any service
or maintenance activities to ensure no lethal voltages are present. Failure to follow this
procedure may result in serious personal injury or death.