TENNEY ENVIRONMENTAL
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TempGard IV Alarm
-
-
O~tional:
1
When a preset temperature limit is reached within the Watlow 93 TempGard IV, the TGlV
alarm contacts open to deenergize Master Contactor ICON, which removes power from the
conditioning control circuitry. The NORMAL light is now extinguished, the red
ALARM light
4LT
illuminates, and the alarm buzzer sounds. The red Chamber OVERTEMP light 3LT will
illuminate when the alarm condition clears
and
the TernpGard IV alarm is cleared as detailed in
the Watlow 93 manual.
Note: The alarm
buzzer with silence switch is an optional feature for all chambers. This alarm
circuitry comes standard with the Watlow 93 TempGard
IV feature. The TempGard IV
configuration is shown in the "Watlow 93 TempGard IV Configuration And Use" section.
Svstem Reset For
Alann
Buuer
I
Silence Switch or TemoGard IV Option
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-
Important!
After an out of limit condition has been corrected, the conditioning control circuits must be
restarted by momentarily pressing the RESET button
IPB. You must remember to clear the
Watlow
93
alarm message.
A
1.5
second timer ITC, is included
in
the reset circuit to provide for automatic start when
power is applied to the chamber. This avoids the need to press the reset button each time that
power is removed and reapplied.
Alarm
Buuer
&
Silence Switch
- -
O~tional:
With this option the silence switch disables the alarm buzzer while corrective action is taken.
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When 1SS is activated, the white Silence light
5LT
will be illuminated. If the alarm buzzer was
)
disabled and the system was successfully reset with IPB, the alarm buzzer will now sound to
alert the operator to place the silence switch
1SS
in
it's normal (down) position.
Heating of the chamber is accomplished with the time proportioned output
1CI-01 of the
Watlow
942
Controller, which turns on triac ITRC to supply power to the heater elements.
These elements are open air low mass
nichrome wires, which have low thermal lag and
provide rapid response to the controller's demands. The heater elements are isolated from the
workspace to prevent direct radiation to the product. Please reference the electrical schematic
for your particular chamber's heater bank ratings.
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