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INPUT FILTER CAPACITOR
CONDITIONING
If the machine will not produce output when turned on
and the following two conditions exist:
The machine is connected to operate at an input
voltage of 380 VAC or higher and
Power has not been applied to the machine for a
long period of time (many months). Then. . .
The Input Filter Capacitor Protection Circuit could have
been activated and prevented output. This means the
Input Filter Capacitors must be conditioned.
The Input Filter Capacitor Protection Circuit monitors
the voltage across input filter capacitors C1 and C2.
When it senses an overvoltage condition, the protec-
tion circuit will prevent the machine from operating.
To condition the Input Filter Capacitors:
1. Turn main power OFF.
2. Remove any load and do not load machine until
conditioning procedure is complete.
3. Turn main power ON.
4. Let the unloaded machine sit for 30 minutes.
5. Turn main power OFF.
6. Turn main power ON.
NOTE: The machine should be ready to operate, and
the protection circuit should have automatically reset
once the capacitors have been conditioned and capac-
itor voltage has reached the acceptable operating
level.
ENVIRONMENTAL PROTECTION
High voltage connections are covered with an RTV
sealant to prevent malfunction in severe environments.
Sealant must be applied to connections which have
been opened or otherwise lost their protection. A non-
corrosive, electronic grade sealant such as Dow
Corning 3140, 3145, or 738; Columbus Adhesives
0172; or GE RTV-162 is recommended. Sealant may
also be purchased from Lincoln Electric (order E2519
Silicone Rubber RTV Coating). Apply sealant after
machine is repaired and tested. All five terminals of the
input rectifier require this type of sealant.
TROUBLESHOOTING & REPAIR
F-78 F-78
INVERTEC STT
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