Troubleshooting - Delta Electronics MVF2000 Series Product Manual

IX. Troubleshooting
The MVF2000 medium voltage drive is comprised of monitoring and protection function.
The failures are categorized into alarms and faults. When there is an alarm, only warning
information will be sent and the system can be powered on, started and operated normally.
When there is a fault, the system will stop immediately and send warning information.
Click
No. Failure item
Input Over
1 Current(Softwar
e)
2 Input phase loss Trip
Input Power
3
Loss
Input Under
4
Voltage
Input Over
5
Voltage
6 Input Grounding Trip
Input Sequence
7
Fault
to view the specific information on alarms or faults.
Caution!

When the MVD has a failure, the reset and re-operation of the system
shall not be conducted recklessly, instead of that, the reason of the
failure shall be found and the system shall be re-operated after
eliminating the failure.

The repair of the MVD shall be conducted after the power is confirmed
to be off and the dc link capacitors of the power cells are completely
discharged.
Troubleshooting list
System
default Failure definition
operation
The input current is
Trip higher than 150% of the
rated current
One or more input high
voltage cable cannot
supply primary power to
the input transformer
The voltage values of
input three phases are all
Trip
lower than 70% of the
rated value
The effective value of
Input voltage is lower
Alarm
than 90% of the rated
value
The effective value of
input voltage is higher
Trip
than 110% of the rated
value
The input grounding
occurs, and the duration
time is above 5s
The input cables are
Trip
reversely connected
Solutions
1. Check the input current.
2. Check the set value.
1. Check the input voltage.
2. Check whether the input
wiring is loosen or
disconnected.
1. Check the input voltage.
1. Check the input voltage.
1. Check the input voltage.
1. Check input cables, copper
bars and transformer.
1. Check the sequence of input
cables.
Remarks
System
operation is
configurable
System
operation is
configurable
System
operation is
configurable