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DISOCONT® Tersus (DT-9) Configuration and Operations Manual
©Schenck Process Group
34
I/O Channel Adjustment
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When setting the output channels use a meter to measure the signal on:
o
AO 1: Connected to wires 142, 143 & 144 (X6-6 and X6-7)
o
AO 2: Connected to wires 139, 140 & 141 (X6-8 and X6-9).
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When setting the input channel source the signal to:
o
AI 1: Connected to wires SIG+ & SIG- (X6-3, X6-4 or X6-3, X6-5).
Follow These Steps:
1) Press [Trim] to initiate the Trim function. Analog Output Channel 1 is always the first one
displayed. To access other channels use the arrow up or down buttons. Press [Exit] to get
back to the main screen.
2) When aligning the output channels, the minimum and maximum analog signals are sent by
the DT-9. The user measures and enters the actual values. The AO 1 values are stored in
P17.11 and P17.12, and the AO 2 values are stored in P17.13 and P17.14.
a. Press the Down arrow button to scroll to the measure mode for output channel
AO 1 Min. The DT-9 will output the minimum signal value. The display will ask for the
measured value. Enter the value measured on your meter in the “Analog value
measured” text box then press [Save] to store.
b. Press the Down arrow button to scroll to the measure mode for output channel
AO 1 Max. The DT-9 will output the maximum signal value. The display will ask for
the measured value. Enter the value measured on your meter in the “Analog value
measured” text box then press [Save] to store.
c. Repeat steps a. and b. for output channel AO 2.
d. Press the [Exit] button to exit the Trim function.
3) When aligning the input channel AI 1, the minimum and maximum analog demand signals are
applied to the input signal wires of the DT-9. The analog demand is measured then stored in
P 17.01 Analog Input 1 Min and P 17.02 Analog Input 2 Max.
a. Press [Trim] then use the arrow keys to select Analog Input 1 Min. Press [Start] to
enter the measure mode. The first value measured is the minimum analog demand
signal AI 1. Use either a precision source or, preferably, a minimum demand signal
directly from the combustion control system. The display will show the value being
measured from the source. Press [Save] to store the value.
b. Press the Down arrow button to scroll to the maximum analog demand signal AI 1
and press [Start] to enter the measure mode. Use either a precision source or,
preferably, a maximum demand signal directly from the combustion control system.
The display will show the value being measured from the source. Press [Save] to
store the value.