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
Содержание ACS 600 MultiDrive
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