MRC DFO Series User manual

Operation manual for
DFO –DFI
Series

General Overview

Main Temperature Controller
Number
Key
Description / Function
③
For setting and calling up parameters.
④
To increase the value of digits.
⑤
To decrease the value of digits.
⑥
R
Revert /STOP/Restart Timer (For machine with timer use
only)
⑦
PV
To display process value, menu symbol and error code.
⑧
SV
To display set point value, parameter value or control output
value.
⑨
C
Process Unit Indicator- Celsius
⑩
ALM 123
Indicator
Over-Heat Temperature.
Lights on when actual temperature over the set temperature
5℃, and turns off the heater.
⑪
OUT 1 2
Control output lamp 1.
Light on when heater is activated
⑫
MANU
Lamp flashes during Manual Mode operates
⑬
COMM
Communication indicator
⑭
TUNE
Lamp flashes during auto-tuning operates
⑮
Lock indicator
Setting parameter
The PV display indicates the parameter symbol, and the SV display indicates the
selected value of the selected parameter.

Setting the Temperature (Continuous mode)
Put the front switch on CONTINUES
Turn on the temperature controller/power switch. The temperature displays light up
and after a few seconds, the upper display shows the present value (PV) temperature.
The lower display shows the set value (SV) or set temperature.
Press to increase temperature gradually.
Press to decrease temperature gradually.
Setting the Temperature (timer mode)
Put the front switch on TIMER
Turn on the temperature controller/power switch. The temperature displays light up
and after a few seconds, the upper display shows the present value (PV) temperature.
The lower display shows the set value (SV) or set temperature.
Press to increase temperature gradually.
Press to decrease temperature gradually.
Press number ③twice. PV display , SV display 1.0
Press to increase or decrease time gradually. Setting time upon what you
need.
The timer will start from the temperature reach setting.
For example:
1.5 = 90 seconds (1.5 minutes), 1.0 = 60 seconds (1.0 minutes) 0.5 = 30 seconds.
Press number ③once. PV display , and SV display 1.0 →It mean the time
will counting down 1 min after temperature reach to the setpoint.
User Calibration (only if needed)
Each unit is calibrated in the factory before shipment. The user can still modify the
calibration in the field.
There are two parameters: Offset Low (OFTL) and Offset High (OFTH) for
adjustment to correct an error in the process value.
Press and hold the key until the setup Menu page is obtained.
Then, press key to scroll to the parameter .
Press key several times to scroll to the parameter OFTL to calibration low
value. Send your low signal to the sensor input of the controller, then press and
release the key. If the process value (the upper display) is different from the input
signal, the user can use and to change the OFTL value (the lower display)
until the process value is equal to the value the user needs. Press and hold the key

for 5 seconds to complete the low point calibration. A similar procedure is applied for
high scale calibration.
The two points OFTL and OFTH construct a straight line. For the
purpose of accuracy, it is best to change the value same on the two points as possible.
Auto-Tuning (only if needed)
Instrument has been set the best PID value; we suggest executing auto-calculating
when temperature is unstable. Enter auto-calculating:
Press and hold until appears on the display then release.
Press and hold at least 5 seconds. The TUNE indicator will begin to flash
and the auto-tuning procedure is beginning.
After the Auto-Tuning process is completed, the TUNE indicator will stop
flashing and the unit will revert to PID control by using its new PID values. The
PID values obtained are stored in nonvolatile memory.
Note: To enable auto-tuning the lock parameter should be set to 1000.