MINAC Systems
Revision A
USER MANUAL
31 January 2005
63860.doc
© For reproduction rights, see cover page.
Page 36
Alarm
Probable Cause
Corrective Action
Over-current
driver alarm
Indicates an over-
current in the inverter.
Possibly caused by a short
in the output circuit, or a
malfunctioning transistor. If
the alarm can not be reset,
there is a malfunctioning
transistor. It may also be
an error on the internal
power supply or other
internal electronic circuits.
1. Check for short circuits in the
induction coil and its terminals. Make
sure that the workpiece does not
short-circuit the coil during operation.
2. Only qualified personnel shall repair
a failure on the internal electronic
circuits.
Inductive
Indicates too inductive
an AC current
An error in the internal
frequency control system.
1. Only qualified personnel shall repair
a failure on the internal electronic
circuits.
Capacitive
Indicates too capacitive
an AC current, or a
short in the output
circuit.
An error in the internal
frequency control system.
Short circuit in the
induction coil or terminals
1. Make sure that there are no short
circuits in the induction coil or its
terminals. (Please note that both the
coil and the terminals must be kept
clean to avoid the risk of short
circuits).
2. Only qualified personnel shall repair
a failure on the internal electronic
circuits.
Over temperature
Inlet water
Indicates that the
temperature of the
cooling water is too
high.
On twin units this alarm
will stop both outputs
– The inlet temperature of
the cooling water is too
high.
– It may be an error on the
internal power supply or
other internal electronic
circuits.
1. Make sure that the inlet cooling
water temperature is below
35°C/95°F. If the temperature has
been too high, it might take some
time before the "Over-temp Water"
alarm can be reset. Let the water
flow through the converter. (the
"Auto Water Shut-off" control
function must not be activated).
If the EOR function is active see
paragraph 5.3.2
2. Any failure on the internal electronic
circuits has to be repaired by
qualified personnel.