Bartlett Genesis LT3140, Техническое руководство, Страница: 1 / 5

GENESIS (Model LT3140) – Technical Manual
GENERAL DESCRIPTION
The Genesis, model LT3140 is Bartlett Instrument’s 8
th
generation kiln controller. We’ve
enhanced all the great features from older models and added many new ones. The Genesis kiln controller
regulates the temperatures in a kiln according to the program set by the artist. It has two different
programming modes, Novice Mode and Advanced Programming. It can control a single zone or multi-
zone kiln.
POWER SUPPLY
The LT3140 board requires a 24V center-tap transformer, as did its predecessors. It connects to
the board’s bottom three quick connects, labeled AC1, CENTER TAP, and AC2. The VA rating of the
transformer is dependent on the electrical load of the board and relays. The board requires approximately
80mA at 12V DC and a relay typically requires approximately 140mA at 12V DC. Therefore, a three-
relay system will require a transformer with a minimum rating of 6VA (500mA X 12V DC = 6 VA).
OUTPUTS
The LT3140 board has five 12V DC outputs. Four outputs are given power by a safety transistor,
outputs 1, 2, 3, and safety. The safety transistor is capacitor coupled to the microprocessor so it only
powers the output transistors when the microprocessor is operating correctly. Outputs 1, 2, and 3 respond
to their respective thermocouple inputs. All outputs are capable of driving a 500mA 12 V DC load.
Output 4 is an extra output that can be programmed to run a fan, alarm, or extra kiln section. The
maximum combined output of all outputs is 1 Amp. The safety output powers on at the beginning of a
firing and off at the end of the firing. It is used to drive a safety relay that sends line power to the
switching relays on outputs 1, 2, and 3. When using the optional current sensor, wiring one section to
each output will give an Amp reading per section for better diagnostics. See Configuration in the
controllers Menu for details on the output 4 options.
FACTORY CONFIGURATION - “HIDDEN MENU”
The “hidden” menu allows programming of options that are normally set at the factory. The
options are listed in the order they appear in the menu with a description. The “hidden” menu can be
entered by pressing “MENU”, scroll down to “Factory Configuration”, and selecting “Factory
Configuration. Then, type in the sequence 4, 4, 3, and the Factory Configuration options will be
displayed. Use the scroll bar on the right to scroll through the options found below:
TC Type, Max
Program Temperature, Max Board Temperature, SSR Mode, Cycle Time, Current Sensor Rating,
and Run Factory Diag.
TC Type
Change the thermocouple type used with the controller from Type K, Type S, or Type R. To
change thermocouple type in Factory Configuration, select the thermocouple type being used with the
controller and press “
Save
”. When changing from a Type K to a Type S or Type R, you must change the
software setting as well as placing a jumper on the circuit board. To change from a Type S or Type R to a
Type K requires changing the software setting and removing a jumper from the circuit board.
WARNING: Using a Type S thermocouple and a controller set for Type K will cause serious
over-fire. Using a Type K thermocouple and a controller set for Type S will cause an under-fire. Type S
thermocouples must use Type S extension wire. Type K thermocouples must use Type K extension wire.
If changing thermocouple type be sure to change the extension wire. Make sure the software and jumper
settings match the type of thermocouple and extension wire you are using.