Vulcan-Hart 3-130, Service Manual

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6.1 SCOPE
This section gives the procedures to be used for the
calibration and specification verification of the VULCAN.
The furnace specifications are given in the Owner &
Operator’s Manual.
6.2 FACTORY REPAIR
DENTSPLY Ceramco maintains a factory repair
department for those customers not possessing the
necessary personnel or test equipment to maintain the
VULCAN. If a unit is returned to the factory for
calibration or repair, a detailed description of the
specific problem should be included to minimize
turnaround time. Call factory for PR number before
shipping at 1-800-835-6639.
6.3 ADJUSTMENT/CALIBRATION
6.3.1 TEMPERATURE
To verify the muffle temperature at a given setpoint
insert the tip of a temperature probe into the exhaust
opening far enough to reach the center of the muffle.
Connect the other end of the probe to a temperature
meter and let the meter reading stabilize. Once a steady
reading is obtained on the temperature meter divide the
setpoint (display) temperature by the meter
temperature and multiply the result by the current Tcal
value. The result will be the new Tcal temperature.
Example:
The temperature meter shows a reading of 520°C at a
setpoint of 500°C. The Tcal temperature in the setup
mode shows 1000°C.
The new setup temperature Tcal is now found by the
following calculation:
500°C
520°C
Tcal = .961 x1000 = 961°C
Note: Abort the cycle before turning off the furnace.
This is the new Tcal temperature. Turn the furnace off
and then on again, wait for Setup? on the display and
press ENTER until Tcal = 1000°C appears. Key in 961 and
press ENTER.
6.3.2 DOOR, LIFT DRAG ADJUSTMENT
The lift drag force is controlled by a set of friction
washers on each of the upper pivot arms A wave spring
should maintain a relatively constant force even after
several thousand cycles. If the drag becomes too stiff
(too hard to open and close furnace) or too loose an
adjustment can be made using the following procedure:
TOOLS REQUIRED: 5/32" Allen Wrench
- Turn the allen head screws on the upper side of the
furnace either clockwise to tighten or counterclockwise
to loosen the drag force.
Note: Equal adjustment should be made on each side.
Turn screws only 1/6 of a revolution at a time when
making adjustment.
6.4 CIRCUIT BOARD CALIBRATION
Calibration of the VULCAN circuit board is performed in
two steps: Software and hardware.
WARNING
With control drawer opened, dangerous voltage points
may be exposed. Contact with any of these points could
cause serious injury.
WARNING
Observe antistatic procedures when touching
circuit board components which can be damaged by
static electricity.
6 – 1
SECTION 6 - ADJUSTMENT/CALIBRATION - 3-STAGE