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Convection Solder Reflow Ovens
Fast Fire Furnaces
High Temperature (to 1150C)
Muffle Furnaces
High Temperature Kilns, Pushers
& Vacuum Furnaces
I.R. Epoxy Curing Ovens
I.R./Convection Reflow Ovens
I.R. Solar Cell Manufacturing
Furnaces
Low Temperature Co-fired Ceramics
(LTCC)
Mid Temperature (to 1000C) Muffle
Furnaces
Multipurpose Curing Ovens
Sikama Solder Reflow Tools
Tabletop; I.R., Convection
and Conduction Solder Reflow Tools
Thick Film Dryers
Thick Film Furnace/Dryer Combination
Units
Thick Film Firing Furnaces
Additional Equipment
"Cleanroom"
Furnaces
Watkins-Johnson
CVD Tool
KIC Thermal
Profiling Equipment
Temperature
Controller Retrofits
Screen
Printers
Plate
Makers, Wire Bonders, Die Attach Machines, Ultrasonic Cleaners, Air
Dryers and Microscopes
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Temperature Controller Retrofits
Computer Based Controller System
• Technical Specifications
• Sample Upgrade Proposal
Non-computer Based Controller System
• Sample Upgrade Proposal
Why not change the controls, instead of the furnace?
If you really like the furnace you have now, except that BTU, LINDBERG,
RTC W-J (MRL) or someone else, has told you that their
controller is "obsolete" or "non-repairable."
LORAC
offers a PC based
controller retrofit that's surprisingly affordable! It usually installs
in
less than an hour! Using your 486 or better PC, the total costs are
less than $10K! Change the controls, not the furnace!
PLUS, our controller comes with free lifetime software upgrades and
is guaranteed not to ever become obsolete, for as long as you own
your furnace.
If interested, please contact us!
Technical Specifications
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BASIC DESCRIPTION
Dimensions:
Length 16.2 inches
Width 10.2 inches
Height 1.5 inches
Electrical requirements:
(power)
15-24 VDC @ 1 amp
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Inputs:
16 digital inputs (TTL, open collector or switch closure to ground)
15 Thermocouple inputs (16-bit resolution)
1 belt speed input (frequency derived from conveyor belt drive)
Outputs:
4 alarm outputs (open collector, .25 amp 50v)
16 general purpose open collector outputs (25 amp 50v)
36 Pulse Width Modulated outputs (open collector, .25 amp 50v)
- OR -
31 0-6V outputs (10 bit resolution)
1 belt speed output (0-6 V)
Communications:
RS-232, software handshake (TX, RX, signal ground only) to be used for
user interface on PC.
User interface via Personal Computer
Real-time clock, nonvolatile memory and watchdog timer included.
System can continue to operate furnace with PC down or disconnected.
PERFORMANCE
Analog inputs:
Resolution: 16 bit
Type of ADC: Dual Slope (7 power line cycles integration period)
Full scale: approximately 60 milivolts
Open circuit detection: yes (1 microamp current injected)
Instrumentation amplifiers with >75 db common mode rejection used on
all inputs.
Accuracy: @ 25 degrees C within 12 microvolts
Stability:
Drift due to ambient temperature: 18-35o C < 5 microvolts per degree
C
36-45o C < 10 microvolts per degree C
46-60o C < 10 microvolts per degree C
Drift due to time: < 30 microvolts per year
Software selectable Thermocouple types: J, K, KPII, W, S, E, and B
Cold junction compensation (within 0.2 degree)
Linearization: in software (error < .01 degree on any type TC)
Each input has it’s own gain and offset (stored in nonvolatile memory,
software calibration)
Outputs:
Pulse Width Modulation (PWM), 0.5 sec cycle time with resolution equal
to power line crossing (zero crossing solid state relays assumed to be
used).
Selectable power phases (load balancing across 3-phase power, reducing
maximum peak current).
SYSTEM PERFORMANCE
Absolute temperature control accuracy trimable to within 1oC,
Typically stable to within 0.5oC
CONFIGURATION OPTIONS
Temperature control loop:
Any thermocouple input can be assigned to any control loop (set point).
Any PWM or 0-6v output can be assigned to any control loop.
Any control loop can have up to 6 trimmed outputs.
Each control loop has the standard PID control parameters.
Controlled ramp up rates separate from PID
Maximum power limits
Alarm bands for each control loop
Alert bands for each control loop
There can be fifteen control loops on this configuration (15 thermocouples)
Any 3 thermocouple inputs can be configured for profiling operations.
Belt speed can be configured to work with opto-interrupter or magnetic
pickup for speed feedback.
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Sample Upgrade Proposal
for LINDBERG Furnace, type 47
LORAC is pleased to offer you the following budgetary proposal covering
the upgrading of the existing control instrumentation for your furnace.
This quotation features the CALCOMMS™ model 9300. This instrument
is a stand-alone individual zone controller, with a 3 year manufacturers
warranty. It can be interfaced either by a 232 port or 485 bus to a laptop
or other external PC. The PC (not included) can perform supervisory and
monitoring functions as well as remote alteration of set-point and other
variables.
The controller is a microprocessor based instrument with "auto-tuning"
capability. This feature allows it to "find" the correct control
algorithms (rate, reset and proportional band) automatically. You get
precise control from the first day of operation, with no learning curve.
It also features internal high-low alarms which can be programmed to protect
the furnace from overtemperature or to alert the operator to a undertemperature
condition. Finally, the new controller can be programmed to "ramp-to-setpoint"
a feature which can greatly extend the useful life of the furnace muffle
and heating elements.
Like other modern controllers, the CALCOMMS™ unit is designed to
operate in conjunction with a Solid-State Relay, to regulate current flow
to the heating elements. Therefore, if your furnace is equipped with older
Silicon Controlled Rectifiers replacement of these components is required.
This will eliminate them as a possible cause of problems in the future
and provide you with a number of spare parts to backup any SCR's that
may be in use on any of your other equipment.
The new instruments fit conveniently into the space vacated by the existing
controllers. The solid state relays are mounted behind the covers in the
space currently occupied by the "SCR's". All mounting bezels,
wiring devices and everything else required to complete the installation
is included.
ITEM 1: TRAVEL EXPENSES AND INSTALLATION LABOR.
ITEM 2: TEMPERATURE CONTROLLERS, model 9300 manufactured by CALCOMM™
@ $550.00 each.
ITEM 3: SOLID STATE RELAYS WITH AIR COOLED HEAT SINKS, manufactured
by CONTINENTAL INDUSTRIES @ $105.00.
ITEM 4: DRIVE SYSTEM CONTROL, manufactured by MINARIK. This new
instrument will provide a digital display of belt speed calibrated in
inches per minute. TOTAL COST, $750.00.
TERMS: All items are FOB delivered, to your facility. All charges
are NET-DUE upon completion of the installation and demonstration of the
operational status of all of the components which we install.
DELIVERY: Normally, 2 weeks or better, ARO.
Thank you very much for your interest in our services.
Very truly yours,
THE LORAC COMPANY
Kenneth F. Reynolds
President
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