Dwyer 2600 - Manual (Page 19)

May, 2013 Page 19 of 52 949-1194 Rev. 7
Program Setup and Operation
Do not cool the process or add heat while the tuning is occurring. In the secondary menu
set t u n E to S E L F . Skip L E r n and check to make sure that d F A C is set to the desired value.
Back up to L E r n and set to Y E S . The control will begin the Self Tune function. While the
Self Tune function is active, the right hand decimal point on the lower display will blink.
When Self Tune is complete, the blinking will stop.
After Self Tune is complete, the t u n E setting automatically switches to P i d . This allows
examination and / or modification of the values calculated. We recommend that you do not
change the calculated values unless you have a firm understanding of the parameters
involved and their function.
OPERATION AND PROGRAMMING OF OPTIONS
Options 924, 926, 928, Analog Remote Set Point
The analog remote set point allows the control set point to be determined by an outside
analog signal. The signal may be 0 to 10 VDC (Option 924), 0 (or 4) to 20 mADC (Option
926), or 0 to 10,000 Ohms (Option 928).
Wire the input as shown on pages 8 and 9.
To set up the analog remote set point, first determine the scale range that the analog
signal will represent. The maximum span is 11,998 degrees or counts. In the Secure Menu
set r S C L for the scale value that will be represented by the low end of the analog signal (0
Volts, 0 mA, 0 Ohms). Set r S C H for the scale value that will be represented by the high
end of the analog signal (10 Volts, 20 mA, 10,000 Ohms).
If you require a suppressed scale or input, use the following equations to determine the
proper settings for r S C L and r S C H .
K = (Highest desired scale reading - Lowest desired scale reading) / (Maximum desired
analog signal - Minimum desired analog signal).
r S C H = ((Maximum possible analog signal- Maximum desired analog signal) * K) + Highest
desired analog reading.
r S C L = Lowest desired scale reading - ((Minimum desired analog signal) * K).
Make sure that a valid analog signal is available to the control. In the Secondary Menu set
the r S P t to O n . The REM indicator on the front of the control will turn on. When the control
returns to the HOME position, the displayed SV will be the value supplied from the analog
remote signal. If the analog remote signal fails or goes out of range of the S P L or S P H
settings, the control will revert to the internal S P 1 (or #S P 1 ), and flash the error message
C H E C r S P t . If S P L or S P H are set outside of r S C L or r S C H then the error will be
suppressed, and the control will attempt to work with the remote value.
To clear the error message, change r S P t to O F F .