WACKER Group IRFUN 38/115 Operator's Manual page 24

Repair instructions
T01036en.fm
There is a risk of injury should a condenser explode when voltage is
applied and, as a result thereof, potting compound is ejected. This is
why you should always wear eye protection and avoid the area right
above the condensers.
Before you apply voltage, always carry out a visual inspection of the
opened inverter. Condensers with bulged tops or ones that are higher
than the others are already damaged. You must not apply voltage to
this inverter!
If a red LED lights up when you turn on the machine, the machine has
shut down because of a detected error.
Malfunction
Green LED is not lit.
Internal vibrator (IR)
not running.
Green and first red
LEDs illuminate.
IR not running.
Green and second
red LEDs illuminate.
IR not running.
Green and third red
LEDs illuminate.
IR not running.
Green and fourth
red LEDs illuminate.
IR not running.
Green and fifth red
LEDs illuminate.
IR not running.
(*) - see Technical Data
For additional protection of the machine against excessive input volt-
age a metal-oxide varistor has been installed in the input circuit.
Cause
- Supply cable
interruption.
- Poor contact
transitions.
- Cable disruption
between frequency
converter (FU) and IR.
- Fault in the FU
electronics.
- Ground contact in the
FU or IR.
- Temperature in the FU
housing too high.
- IR runs sluggish.
- Short circuit between
FU and IR.
- Incorrect input voltage,
too high or too low.
24
Remedy
- Check supply cable.
- Check contact transitions
(switches, connectors) and
rework if necessary.
- Check cables and replace if
faulty.
- Replace FU.
- Insulation measurements
at IR and FU, replace faulty
components.
- Measure the current values
(*) in the output lines.
- Remove fault in the IR.
- Locate the short circuit by
measurements and
remove.
- Measure voltage at the
switch.
- Check generator.