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E-9
THEORY OF OPERATION
E-9
POWER WAVE 455/POWER FEED 10
OVER CURRENT
PROTECTION
If the average current exceeds 590 amps,
then the peak current will be limited to 100
amps until the average current decreases to
under 50 amps.
UNDER/OVER VOLTAGE
PROTECTION
A protective circuit is included on the
control board to monitor the voltage across
the input capacitors. In the event that a
capacitor voltage is too high, or too low, the
protection circuit will de-energize the input
contactor. Machine output will be disabled
and the “soft start” mode will be repeated.
The protection circuit will prevent output if
any of the following circumstances occur.
1. Capacitor conditioning is required.
(May be required if machine has been
off for a long period of time and is con-
nected for high input voltage operation.)
2. Voltage across a capacitor exceeds
390 volts. (High line surges or improp-
er input voltage connections.)
3. Voltage across a capacitor is under 70
volts. (Due to improper input voltage
connections.)
4. Internal component damage.
THERMAL PROTECTION
Two normally closed (NC) thermostats pro-
tect the machine from excessive operating
temperatures. These thermostats are wired
in series and are connected to the control
board. One of the thermostats is located on
the heat sink of the output rectifier and the
other is located near the fan. (On later pro-
duction machines this thermostat is located
on the output choke) Excessive tempera-
tures may be caused by a lack of cooling air
or operating the machine beyond its duty
cycle or output rating. If excessive operat-
ing temperatures should occur, the ther-
mostats will prevent output from the
machine. The yellow thermal light, located
on the front of the machine, will be illuminat-
ed. The thermostats are self-resetting once
the machine cools sufficiently. If the ther-
mostat 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 are obstructed, then
the power must be removed from the
machine, and the fan problem or air
obstruction corrected. On later production
machines (above code 10500) the cooling
fan runs only when necessary. The F.A.N.
(fan as needed) system is controlled by the
control board via a solid state relay.
PROTECTIVE CIRCUITS
Protective circuits are designed into the
Power Wave 455 to sense trouble and shut
down the machine before damage occurs to
the machine's internal components.
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