ABB ACS580MV Commissioning Manual page 74

74 Standard Commissioning Process
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Measure the MCB open time roughly in graph by comparing the signals MCB OFF
command (-1) and MCB status open.
Note: The MCB open time should less than 100ms.
Checking Bypass unit logic
The bypass unit is mainly used as a back-up for a drive failure (e.g. a trip) or drive
maintenance. The motor is then switched to bypass mode.
The bypass unit can be manufactured by the 3rd supplier following the
Engineering Guideline
connecting the drive to medium voltage.
NOTICE If ABB bypass unit as the option (MBU=0001, MBU=0002 or MBU=0003) is
ordered, the MBU should pass the commissioning described in
DANGER For testing the MCB make sure the MCB is racked out into test
position. These tests must be made without medium voltage connected.
The output of the drive must never be connected to the feeder!
According to the project specifications test the bypass unit functionality.
Make sure that all the below listed conditions are fulfilled (refer to the principle diagram
below):
•
If converter is discharged (S1 open) S3 cannot be closed.
•
If S3 is closed, S2 cannot be closed.
•
If two commands are given at the same time only one can be active.
•
Transition from Converter to Bypass: S2 can be closed only if S3 is open.
•
Transition from bypass to converter operation:
a. S1 can be closed only after S2 has opened.
b. S3 can be closed only after the drive is charged.
•
Bypass command given while the drive is not charged:
a. While S3 is closed it has no effect - S2 stays open.
b. When S3 is open it is possible activate Bypass - S2 closes.
•
Bypass command given while the drive is running is not possible - has no effect.
•
S3 open command given while the drive is running - not possible - drive should be
stopped first.
Checking connection to overriding system
Follow the application design, configure and active the connection between the drive and
overriding system.
(2UBB013672). ABB engineer should check the logic before
CS580MV
MBU Commissioning.