EFD MINAC 25 Twin User Manual page 38

MINAC Systems
USER MANUAL
63860.doc
Alarm
Switch mode power
supply alarm
Indicates a problem on
the SMPS card.
On twin units this alarm
will stop both outputs
Power Supply Alarm
Indicates a problem on
the power supply unit.
On twin units this alarm
will stop both outputs
AC over-current
alarm
Low frequency alarm
High frequency alarm
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Operational Failures
Probable Cause
– A missing phase.
– Main fuse break.
– Broken fuse(s) in the
internal switch mode
power supply
– Faulty switch mode
power supply.
– Error in external
connected equipment, if
any.
– Error on the internal
power supply or other
internal electronic
circuits.
– AC over-current can be
caused by a short circuit
in high-power modules
CAP, CON or HHT,
including cables. Most
common is a short circuit
in the induction coil or its
terminals.
– It may also be an error
on the internal power
supply or other internal
electronic circuits.
Too low or too high
frequency is most
commonly caused by an
incorrectly designed
induction coil. The coil may
have too large or too small
an area, or it may be short-
circuited. Operation at full
load with a very low
frequency (7-8 kHz) may
also be the cause. It may
also be an error on the
internal power supply or
other internal electronic
circuits.
Revision A
31 January 2005
Corrective Action
1. Make sure that the supply voltage
consists of all three phases.
2. Check the main fuses 1F1, 1F2,
1F3.
3. Only qualified personnel shall repair
a failure on the internal electronic
circuits.
1. Remove externally connected
equipment, and reset the alarm.
2. Only qualified personnel shall repair
a failure on the internal electronic
circuits.
1. Check that the coil is within the
system performance.
2. Inspect the above mentioned
systems for short circuits.
3. Only qualified personnel shall repair
a failure on the internal electronic
circuits.
1. Check that the coil is within the
system performance.
2. Inspect the above mentioned
systems for short circuits.
3. Only qualified personnel shall repair
a failure on the internal electronic
circuits.
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