Specifications

NOTE

If the power to furnace is "turned off" or interrupted while in "tuning,"upon returning power to

furnace, the controller display will indicate "LinE FAIL" because sampled data could be

questionable. To restart tuning, refer to "Tuning" procedure.

If the controller cannot maintain temperature setpoint, "tunE FAIL" will appear on display.

First, correct problem responsible for not maintaining the temperature setpoint, then restart

the "tuning" procedure.

Changing Temperature Indication:

Push "SCROLL" button once, "°C" will appear. This indicates temperature measurement. (Contact

Thermolyne if control needs to be changed to °F.)

Setting the High Alarm Temperature (Over Temperature Protection OTP):

Push "SCROLL" button until "AL.SP" (Alarm Setpoint) appears. The lower display should indicate

1100°C.

NOTE

HIAL- HIGH ALARM. (over-temperature protection, OTP)

The controller is fitted with a mechanical relay which is de-energized in the alarm mode. This

relay, when de-energized, removes power from the heating elements. If the primary control

circuit fails, the OTP will control the furnace temperature at the preset value you have

entered. It does not shut off the furnace. but will maintain the chamber temperature at that

value.

Depress either the "UP" or "DOWN" button to select the OTP value you desire. Thermolyne recommends

that you set the value either at the maximum operating temperature of the furnace or a value of 20

degrees above your working temperature if you desire to provide protection for your workload.

Alarm Indications:

Over-temperature

In the event that the furnace chamber temperature exceeds the value of "AL.SP", the red "AL" lamp will

light and the alarm relay will be de-energized, cutting off power to the heating elements. When the

chamber temperature falls below the value of "AL.SP", the red "AL" lamp will extinguish and the alarm

relay will re-energize, returning power to the heating elements and allowing the chamber to heat again.

This process will repeat continuously until you rectify the problem that caused the over-temperature

situation.

Thermocouple Failure

In the event that the thermocouple circuit breaks or the thermocouple fails, the display will indicate

"SnSr FAIL" and the output power level will be decreased to 0%. When the problem with the

thermocouple circuit has been rectified, the controller will resume controlling with the same output power

level used at the moment of the break or failure.