THERMO SCIENTIFIC FD1535M (01) PDF Document

For optimum element life, it is suggested that the THERMO SCIENTIFIC FD1535M be used for applications requiring temperatures from 212°F (100°C) to 2192°F (1200°C). For maximum element life, it is recommended to operate the THERMO SCIENTIFIC FD1535M at temperatures from 212°F (100°C) to 1950°F (1066°C) for continuous use, or temperatures from 1950°F (1066°C) to 2192°F (1200°C) for intermittent use.

Continuous use is operating the THERMO SCIENTIFIC FD1535M for more than 3 hours and intermittent use is operating the furnace for less than 3 hours.

The unit consists of: 1) heating chamber, 2) a digital controller and 3) a door interlock relay for user safety.

The specifications for the THERMO SCIENTIFIC FD1535M are provided in the table below:

Operating conditions for the THERMO SCIENTIFIC FD1535M are: 17°C – 27°C; 20% to 80% relative humidity, non-condensing. Installation Category II (over-voltage) in accordance with IEC 664. Pollution Degree 2 in accordance with IEC 664. Altitude limit: 2,000 meters. Storage conditions are: -25°C to 65°C; 20% to 80% relative humidity.

To avoid electrical shock, the THERMO SCIENTIFIC FD1535M furnace must:

1. Use a properly grounded electrical outlet of correct voltage and current handling capacity.

2. Disconnect from the power supply prior to maintenance and servicing.

3. Have the door switch operating properly.

To avoid burns, the THERMO SCIENTIFIC FD1535M furnace must not be touched on the exterior or interior surfaces during use or for a period of time after use.

To avoid personal injury with the THERMO SCIENTIFIC FD1535M furnace:

1. Do not use in the presence of flammable or combustible materials; fire or explosion may result. This device contains components which may ignite such materials.

2. Refer servicing to qualified personnel.

Both the ON/OFF power switch and the digital display will illuminate when power is switched ON. The THERMO SCIENTIFIC FD1535M furnace will begin to heat to the controller’s current setpoint.

The amber cycle light on the THERMO SCIENTIFIC FD1535M will illuminate whenever the power is being applied to the heating elements. The cycle light will flicker on/off as furnace reaches setpoint.

The door safety switches on the THERMO SCIENTIFIC FD1535M remove power from the heating elements when the door is opened. Open and close the door a few times; note that the amber CYCLE light will be out when door is open. This check must be done when furnace is heating or when cycle light is illuminated. If this condition is not true, consult the Troubleshooting section before proceeding.

The digital readout of the THERMO SCIENTIFIC FD1535M continuously displays chamber temperature.

If you want to change the setpoint on the THERMO SCIENTIFIC FD1535M, press the SCROLL button until “SP1” is displayed. Press the UP or DOWN button until the desired setpoint value is displayed and then release the button. A few seconds after the button is released, the controller will accept the new value and is indicated by a brief flash of the display. Press PAGE button to return to HOME DISPLAY.

To view the display units on the THERMO SCIENTIFIC FD1535M, press SCROLL until “UNITS” is displayed. The temperature units are also shown on the HOME DISPLAY to the right of the measured value (process value). Temperature units can be changed by pressing up and down buttons. Choice of Celsius (°C), Fahrenheit (°F), Kelvin (°K), Percentage (%), or None (nonE).

The controller parameters available on the Home display for the THERMO SCIENTIFIC FD1535M are:

°C, °F, °K, %, or None: Temperature units in Celsius (default), Fahrenheit, Kelvin, Percentage (PErc), or None (nonE).

A1.DHI: Deviation high alarm.

A2.HI: High Limit alarm. Read Only.

A3.LO: Low Limit alarm. Read Only.

A.TUNE (tune): One-shot autotune enable.

WRK.OP: Working Output power. Read Only.

PV.OFS: Process Value Offset. Read Only.

SP.RAT: Ramp Rate Setpoint (default units is minutes).

DWELL: Time for dwell or delay (default units is minutes).

T.STAT: Timer Status. Active only when timer is active.

TM.CFG: Timer configuration.

The PID list parameters for the THERMO SCIENTIFIC FD1535M controller include:

PB: Proportional band (in display units).

TI: Integral time in seconds.

TD: Derivative time in seconds.

The controller on the THERMO SCIENTIFIC FD1535M will flash an alarm message in the home display if an alarm condition is detected:

A2.HI: Measured value full scale high alarm.

A1.DHI: Measured value deviation high alarm.

S.br: Sensor break: check that sensor is connected correctly.

LBR: Loop break: check that the heating circuits are working properly.

Ld.F: Heater Circuit fault: indication of either an open or short solid state relay, a blown fuse, missing supply or open circuit heater.

This controller on the THERMO SCIENTIFIC FD1535M provides sensor break protection in the event the thermocouple opens. If an open thermocouple condition occurs, the digital display will blink “S.br” and the power to the heating element will be shut OFF (Cycle light will extinguish).

The OTP on the THERMO SCIENTIFIC FD1535M will be in effect during any alarm condition when the temperature of the furnace has deviated beyond the limit. The “Deviation High” alarm is the only alarm value, which can be changed. To change it, press the SCROLL button until “A1.DHi” appears on the display. Press the UP or DOWN button to select the OTP value you desire. We recommend a value of 20° above your working temperature to provide protection for your workload. In addition to over temperature protection, units containing a single setpoint controller w/OTP feature a mechanical OTP relay device, which disconnects power from the elements in an alarm condition.

Before starting a tuning cycle on the THERMO SCIENTIFIC FD1535M:

Furnace must be at ambient temperature before starting a tune.

“Stat” and “Sp.rr” must be set to OFF or “tunE” will not initiate.

To use the tuning feature on the THERMO SCIENTIFIC FD1535M controller:

1. Start tuning with the process at ambient temperature. This allows the tuner to calculate the low cutback and high cutback values more accurately.

2. Adjust the setpoint to your desired value.

3. Press the SCROLL button until display reads, “A.TUNE.”

4. Press the UP or DOWN button to select, “on.”

5. Press the PAGE button to return to the HOME DISPLAY. The display will alternately flash between “tunE” and the HOME DISPLAY while tuning is in progress.

6. The controller will then turn the heating on and off to induce an oscillation. When the measured value reaches the required setpoint the first cycle will end.

7. Tuning will be complete after two oscillation cycles and then the tuner will turn itself off.

8. Normal control function will resume after the controller calculates tuning parameters.

Tune has completed when “tunE” stops flashing on display on the THERMO SCIENTIFIC FD1535M.

The Ramp and Dwell on the THERMO SCIENTIFIC FD1535M can be configured to five different modes:

1. Mode 1 (DWELL) The dwell time begins once the setpoint reaches the set threshold. The END TYPE action is executed when the dwell timer reaches the end.

2. Mode 2 (DELY) The timer starts immediately upon instrument power-up, or when run is selected. The instrument remains in standby until the time has elapsed. After the time has elapsed, the instrument controls up to setpoint.

3. Mode 3 (SF.ST) Starts automatically on power up. This is a soft-start function. If the PV is below the Soft Start Threshold, then the power is limited to the Soft Start Limit until the threshold is met.

The program on the THERMO SCIENTIFIC FD1535M must be stopped and the controller must be displaying the actual temperature before beginning the Setup.

To set the Ramp Rate (“SP.RAT”) for the THERMO SCIENTIFIC FD1535M:

1. Press the SCROLL button until the “SP.RAT” (Ramp Rate) is displayed.

2. Set the desired Ramp rate with the UP or DOWN buttons, if the ramp to setpoint feature is needed. If the Ramp rate is not needed, then set to “OFF” with the UP or DOWN buttons.

To set the Ramp & Dwell mode (“TM.CFG”) for the THERMO SCIENTIFIC FD1535M:

1. Press the SCROLL button until “TM.CFG” (Ramp & Dwell mode) will be displayed, select the desired mode with the UP or DOWN buttons. (DWEL, DELY, or SF.ST).

To set the Dwell time (“DWELL”) for the THERMO SCIENTIFIC FD1535M:

1. Press the SCROLL button until “DWELL” will be displayed set the desired Dwell time with the UP or DOWN buttons.

To run a program on the THERMO SCIENTIFIC FD1535M:

1. Press the SCROLL button until “T.STAT” is displayed, set to “run” with the UP or DOWN buttons; or from the HOME DISPLAY, press UP and DOWN arrows together.

2. Press the PAGE button to display Actual temperature.

To hold a running program on the THERMO SCIENTIFIC FD1535M:

1. Press the SCROLL button until “T.STAT” is displayed. Set to “hold” with the UP or DOWN buttons; or from the HOME DISPLAY, press UP and DOWN arrows together.

2. Press the PAGE button to display Actual temperature.

To stop a running program on the THERMO SCIENTIFIC FD1535M, press the SCROLL button until “T.STAT” is displayed, Set to “res” with the UP or DOWN buttons.

To clear the flashing End on the THERMO SCIENTIFIC FD1535M, press the PAGE and SCROLL buttons at the same time.

To verify a running program on the THERMO SCIENTIFIC FD1535M, press the SCROLL button until “T.STAT” is displayed. The display will show “run” if the program is running, “hold” if it is paused or “res if it is not running. Press the PAGE button to display actual temperature.

If you want to change the setpoint on the THERMO SCIENTIFIC FD1535M, press the UP or DOWN button until the desired setpoint value is displayed in the lower display and then release the button.

From the HOME DISPLAY on the THERMO SCIENTIFIC FD1535M, press the SCROLL button. The display will briefly show the temperature units in °C/F/K and then return to the HOME DISPLAY. (If you require a different temperature unit call Customer Service)

From the HOME DISPLAY on the THERMO SCIENTIFIC FD1535M, press the SCROLL button twice. Press the UP or DOWN button to display the value. This value is a read-only value and cannot be changed.

The RUN/HOLD button operation on the THERMO SCIENTIFIC FD1535M is as follows:

• Starts a program when pressed once-RUN light illuminates.

• Holds a program when pressed again—HOLD light illuminates.

• Cancels hold and continues running when pressed again-HOLD light is off and RUN light illuminates.

• Exits a program when the button is held down for two seconds-RUN and HOLD lights are off.

• At the end of a program the RUN light will flash.

• During holdback the HOLD light will flash.

The purpose of tuning for the THERMO SCIENTIFIC FD1535M is to match the characteristics of your controller to the characteristics of the process being controlled. Good control is evidenced by: stable, straight-line control of the setpoint temperature with no fluctuations; No overshoot or undershoot of the setpoint temperature; rapid restoration of the setpoint temperature when external disturbances cause deviations from the setpoint.

If the display on the THERMO SCIENTIFIC FD1535M flashes “tu.ER” if an error occurs during tuning, to clear the error and restart tuning, simultaneously press the PAGE and SCROLL buttons and follow the steps outlined in “Autotuning.”

To stop the tuning function on the THERMO SCIENTIFIC FD1535M, simultaneously press the PAGE and SCROLL buttons.

The G.SP gain schedule setpoint on the THERMO SCIENTIFIC FD1535M is factory set at 700° C. The G.SP must be adjusted to 200°C from the desired setpoint temperature when tuning.

To tune the THERMO SCIENTIFIC FD1535M furnace using autotuning:

1. Load your furnace with a load similar to your normal load and close the door.

2. Set the setpoint temperature.

3. Press the PAGE button until the display reads, “Atun LiSt.”

4. Press the SCROLL button until “tunE OFF” is displayed.

5. Press the UP or DOWN button to select “on.”

6. Simultaneously press the PAGE and SCROLL buttons to return to the HOME DISPLAY. The display will flash “tunE” while tuning is in progress.

To tune the THERMO SCIENTIFIC FD1535M furnace using adaptive tuning:

1. Load your furnace with a load characteristic of those you intend to heat in it.

2. Press the PAGE button until display reads, “Atun LiSt.”

3. Press the SCROLL button until “drA OFF” is displayed.

4. Press the UP or DOWN button to select “on.”

5. Press the SCROLL button until “drA.t” is displayed.

6. Press the UP or DOWN button until the desired trigger value is achieved.

For best results, use only the center 2/3 of the furnace chamber of the THERMO SCIENTIFIC FD1535M.

If you are heating a number of small parts, spread them throughout the center two-thirds of the furnace chamber.

Keep objects away from thermocouple.

Use insulated tongs and mittens when loading and unloading furnace.

Always wear safety glasses.

Use the hearth plates supplied to protect bottom of chamber. Part # PHX2.

Before using any cleaning or decontamination method except those recommended by Thermo Scientific, users should check with Thermo Scientific that the proposed method will not damage the equipment.

Disconnect the THERMO SCIENTIFIC FD1535M furnace from power supply before cleaning.

Opening the door of the THERMO SCIENTIFIC FD1535M for an extended period of time will cause the painted surfaces above the door to be discolored or burnt.

Clean the outside case of the THERMO SCIENTIFIC FD1535M unit by wiping with a damp cloth and mild soap solution.

If the cycle light on the THERMO SCIENTIFIC FD1535M does not illuminate, possible causes and corrective actions are:

If the THERMO SCIENTIFIC FD1535M furnace does not heat, possible causes and corrective actions are:

If the door switch on the THERMO SCIENTIFIC FD1535M does not cut power to heating elements, the possible cause is the door switch not functioning, and the corrective action is to Realign or replace door safety switch.

If the controller over-temp. does not cut power to the furnace chamber of the THERMO SCIENTIFIC FD1535M, possible causes and corrective actions are:

For slow heatup on the THERMO SCIENTIFIC FD1535M, possible causes and corrective actions are:

For repeated element burnout on the THERMO SCIENTIFIC FD1535M, possible causes and corrective actions are:

For inaccurate temperature readout on the THERMO SCIENTIFIC FD1535M, possible causes and corrective actions are:

To Replace a Heating Element on the THERMO SCIENTIFIC FD1535M:

1) Disconnect furnace from power supply.

2) Remove back terminal cover.

3) Loosen the nuts on the terminals of the element to be replaced.

4) Straighten the leads of the old element.

5) Open the door and pull the defective element out. (It may be easiest to turn the furnace so that the element to be removed is on top.)

6) Slide the new element into place, threading the leads through the insulating porcelain bushing in the back of the furnace.

7) Reverse the disassembly procedure, making sure you thread all element lead wires through the insulating porcelain bushings on the back of the furnace and cut off any excess element lead wire after securing the leads to the terminal points.

8) Replace the back terminal cover.

9) Reconnect furnace to power supply.

10) Test the operation of the furnace.

To Replace The Platinel II Thermocouple on the THERMO SCIENTIFIC FD1535M:

1) Disconnect the furnace from power supply.

2) Remove the back terminal cover. (Note placement and connection of wires.)

3) Remove the screw and washer from clip holding the thermocouple in place and remove the nuts and washers on the thermocouple terminals.

4) Remove the thermocouple.

5) Insert the new thermocouple straight through hole in the chamber until the tip extends approximately 1″ into the chamber. Make sure the thermocouple lead wire with the colored bead is connected to the terminal marked positive.

6) Secure the thermocouple extension wires to the terminals (yellow to +).

7) Secure the thermocouple with clip, screw and washer.

8) Replace the back cover.

9) Reconnect furnace to power supply.

10) Test the operation of the furnace.

To Replace Door Switch (Micro-Switch) on the THERMO SCIENTIFIC FD1535M:

1) Disconnect the furnace from power supply.

2) Remove the screws from the front dial and the three bottom screws and lock washers on the back cover of the control section.

3) Remove the back terminal cover.

4) Disconnect the two wires on terminals T1 and T2 going to the control section.

5) Slide the control section forward.

6) Remove two screws and nuts from the door switch and slide the switch from the wire rod.

7) Disconnect the wires from the door switch. Identify or mark the wires disconnected to insure proper placement and connection when reinstalling.

8) Reconnect the wires identified or marked in step 7 to the new door switch.

9) Install the new door switch while sliding it over the wire rod and secure with the screws and nuts removed in step 6.

10) Slide the control section back and replace the screws and lock washers described in step 2.

11) Connect wire marked T1 to terminal T1 and wire marked T2 to terminal T2 with nuts removed in step 4.

12) Replace the back terminal cover with screws and lock washers removed in step 3.

13) Test operation of door switch. (See next section “To Realign Door Switches” step 5.)

14) Reconnect to power supply.

To Realign Door Switches on the THERMO SCIENTIFIC FD1535M:

1) Disconnect the furnace from power supply.

2) Loosen the setscrew on the cam. Open the door approximately 1″ and rotate the cam counterclockwise until you hear a click then rotate the cam clock- wise until you hear a click, tighten the set screw on adjusting cam.

3) Open and close the door; the switch should click when the door is opened approximately 2″ and 1″ to 2″ before the door is closed.

4) Reconnect to power supply.

5) To test the operation of the door switch: turn the power switch on, set the control to a setting high enough to keep the control from cycling, open and close the door; the cycle light should turn OFF when the door is opened approximately 2” and turn back ON 1″ to 2″ before the door is closed.

To Replace the Controller on the THERMO SCIENTIFIC FD1535M:

The controller plugs into a panel mounting sleeve, which should be left permanently installed in the furnace housing. To remove the controller, release the side clips and slide the controller out. Do not attempt to dismantle this unit further; replace it with a Thermolyne loaner or a new unit.

When requesting service, replacement parts or in any correspondence concerning the THERMO SCIENTIFIC FD1535M, please refer to the Specification Plate for complete model number, serial number, and series number.

If available, please provide the date purchased, the source of purchase (manufacturer or specific agent/rep organization), and purchase order number.