ABB ACS 600 MultiDrive, User Manual

Page: 43 / 109

Chapter 6 – Firmware Description
6-10 ACA 635 IGBT Supply Sections
Missing Phase There is no direct a.c. voltage measurement in the ISU. The lost supply
voltage is identified with current and DC voltage measurement.
When the ISU detects that the current has been below the value of
Parameter 142.01 NET LOST CUR LIM
for the time defined by
Parameter 142.02 ZERO CUR DELAY , an alarm (Parameter 9.12
SUPPLY ALARM WORD bit 10 NET LOST) is generated. The ISU tries
to resynchronize as long as the DC voltage is greater than (Par. 2.07
DC REF INITIALIZ - Par. 142.04 DC START DEV NET). The
resynchronizing checks are made at intervals defined by Parameter
142.03 NET TEST DEL. If the voltage in the DC link falls below the limit
defined by Par. 145.04 DC UNDERVOLT TRIP, the ISU will open the
main contactor/breaker and a fault (Parameter 9.11 bit 14 DC
UNDERVOLT) is generated.
The sensitivity to the detection of a missing supply phase can be set by
the following parameters:
Code Parameters Unit Description
142.01 NET LOST CUR LIM A Current limit for supply lost
142.02 ZERO CUR DELAY ms Time delay for detection
142.03 NET TEST DEL ms Time between supply back
checks
142.04 DC START DEV NET V Allowed DC voltage
measurement deviation from
Par. 2.07 DC REF INITIALIZ
before resynchronization
145.04 DC UNDERVOLT TRIP V Undervoltage tripping limit
Alarm
9.12 bit 10 NET LOST Supply lost alarm
Fault
9.11 bit 14 DC UNDERVOLT Undervoltage tripping