Rev
A:
06/15/98 Preparation for
Use
TP04100A Interface
&
Applications
2-8
Overheat
Safety: SF1
and
SF2
Sensors
CAUTION
9: The two thermal runaway Safety sensors (SF
1
and SF2) located on the rear panel must
remain plugged in for normal operation. If SF2 is not plugged in when the system is powered On,
then an internal fuse must be replaced by qualified service personnel before normal operation can
resume. Only qualified service personnel should disconnect SF1 andlor SF2.
AVERTISSEMENT
9: Se reporter au numCro d1Avertissement ou au numCro &Attention appropriC,
dam la section
((
Consignes de s6curitC
B
au dCbut de ce manuel.
WARNUNG
9: Bitte beziehen Sie sich auf die entsprechende Warnungs- oder Vorsichtsnummer im
Abschnitt iiber Vorsichtsmal3regeln am Anfang dieses Handbuchs.
ADVERTENCIA
9: Vea el n~mero de la Advertencia o Precaucidn en la secci6n de "Precauciones de
Seguridad", a1 comienzo de este manual.
Safety regulations require there be two independent levels of protection against overheat and fire.
Thermocouple sensors Safety 1 and Safety
2
(SF1 and SF2), located on the system rear panel (see Figure 2-
8),
are designed as independent, redundant, safety protection against system thermal runaway.
Leave both SF1
and
SF2 plugged into the rear panel at all times: SF1 and SF2 are for system use only.
If SF2 (secured with a protective strap) is not plugged into the rear panel input when the system is powered
up, then an internal fuse will blow, disabling heater function. Qualified service personnel are required to
replace the internal fke.
SFl, set at
250
"C, is first activated in the unlikely event the system fails to respond to temperature control
from the microprocessor. If SF1 is activated, then the system power must be cycled Off, then On, to reset
SF1.
SF2, set at
275
"C, is activated only if SF1 fails to activate. If SF2 activates, then qualified service personnel
are required to replace the internal fuse.
The Main Air thermocouple MA TC regulates temperature using a thermocouple located in the Thermal
Wand airstream. The
MA
TC input is located on the rear panel. The two DUT thermocouples, Type
K
or
Type
T,
with inputs located on the front panel, are an alternative means of temperature control.
For thermocouple interfacing and attaching directions, see Section 2- 17.
Page
2-9
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