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E-5 E-5
TROUBLESHOOTING & REPAIR
MULTI-SOURCE
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PROTECTION DEVICES AND CIR-
CUITS
Several thermostats protect the Multi-Source from
over temperature and /or excessive loading. High
transformer watts could cause the main transformer to
over heat so the cooling fan is activated if a thermo-
stat, located on the front of the main transformer iron,
should open.
Two additional thermostats (connected in series) pro-
tect the machine in case of fan failure or blocked air-
flow at normal output loads. The opening of either the
secondary or SCR heat sink thermostat(s) will disable
the machine's output and cause the amber thermal
light to glow.
The thermostat, located at the rear of the main trans-
former iron, senses the lamination temperature (and
thus the coil insulation temperature) and will interrupt
power to the control board causing the input contac-
tor to open until the iron cools.
A 10 amp circuit breaker protects the 120VAC fan cir-
cuit. This is located on the front panel of the machine
and may be reset if tripped.
An independent safety circuit on the control board
monitors the output voltage peaks and opens the input
contactor if the upper limit is exceeded for over 300
ms.
If the output current of the machine should exceed the
set limitations the control board will disable output for
about 75 seconds.