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PERIODIC MAINTENANCE
Overload Protection
The machine is electrically protected from producing
high output currents. Should the output current
exceed 340-360A, an electronic protection circuit will
reduce the current to approximately 150A. The
machine will continue to produce this low current until
the protection circuit is reset. Reset occurs when the
output load is removed.
Thermal Protection
Thermostats protect the machine from excessive
operating temperatures. Excessive temperatures may
be caused by a lack of cooling air or operating the
machine beyond the duty cycle and output rating. If
excessive operating temperature should occur, the
thermostat will prevent output voltage or current. The
meter will remain energized during this time.
Thermostats are self-resetting once the machine cools
sufficiently. If the thermostat shutdown was caused by
excessive output or duty cycle and the fan is operating
normally, the Power Switch may be left on and the
reset should occur within a 15 minute period. If the fan
is not turning or the air intake louvers were obstructed,
then the power must be switched off for 15 minutes in
order to reset. The fan problem or air obstruction must
also be corrected.
Filter Capacitor Conditioning
A protection circuit is included to monitor the voltage
across filter capacitors C1 and C2 (also C14 and C15
on 575 VAC units). In the event that the capacitor volt-
age is too high, the protection circuit will prevent out-
put. The protection circuit may prevent output provid-
ing all these circumstances are met:
1. Machine is internally connected for 380 VAC, or
higher input voltage.
2. Machine did not have power applied for many
months.
3. Machine did not produce output when power was
first switched on.
If these circumstances apply, the proper action is to
switch the machine on and let it idle for up to 30 min-
utes. This is required to condition the filter capacitors
after an extended storage time. The protection circuit
will automatically reset once the capacitor conditioning
and resultant voltage levels are acceptable. It may be
necessary to turn the power switch off and back on
again after this period.
TROUBLESHOOTING
Visual Inspection
Clean interior of machine with a low pressure
airstream. Make a thorough inspection of all compo-
nents. Look for signs of overheating, broken leads or
other obvious problems. Many problems can be
uncovered with a good visual inspection.
Open Circuit Voltage
The open circuit voltage of the Invertec V300-PRO is
60 to 75 VDC and cannot be adjusted by the output
control.
Test Conditions
Perform all testing at the lowest input voltage avail-
able, except where a higher voltage is required by a
test step. Make ohmmeter checks only after power
has been disconnected from machine and after
capacitors have been discharged.
Certain high voltage connections have been insulated
with RTV sealant. It is necessary to break through the
sealant with a sharp probe in order to make voltage or
resistance checks.
Disconnect any control cables from remote control
receptacle.
ELECTRIC SHOCK can kill.
• Have an electrician install and service
this equipment.
• Turn the input power off at the fuse
box before working on equipment.
• Do not touch electrically hot parts.
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EXPLODING PARTS can cause
injury.
•
Failed parts can explode or cause other
parts to explode when power is applied.
•
Always wear a face shield and long sleeves when servicing.
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WARNING