Super Systems 9120 - Manual (Page 14)

4574 - SSi 9120 Manual Rev A Page 14 Super Systems Inc
Loop 1 inc Input 2 retrans
Loop 1 dec Input 3 retrans
Loop 1 combo PV1 retrans w/ expo range
PV 2 retrans O2 offset log
Loop 2 inc SP1 retrans
Loop 2 dec SP2 retrans
Loop 2 combo DP retrans
Disassociation
Nit_Pot
Hydrogen
Combo example for carbon – 4 – 12 mA Air
12 – 20 mA Gas
Offset
This is the starting point, the Process Variable value at which you get 4 milliamps. Clicking on this value will display an
input box from which the user can select a new value. The range is –32768 to 32767.
Range
This is a Process Variable value between 4 and 20 milliamps. Clicking on this value will display an input box from which
the user can select a new value. The range is –32768 to 32767.
Note: The range, although not displayed with a
decimal point, contains a decimal point that is dependent on the process variable selected. For example, If the offset is
20 mV for 4 mA, and you want 100 mV to be 20 mA, then your range should be 80. If the process variable is
temperature, then the range will be 80, since temperature PVs do not have a decimal. If the PV is % Carbon, then the
range will need to include the two decimal points for % Carbon. So, a range of 80 will be entered as 8000
. See below
for more examples.
Current Selection
Provides the option of 4-20 mA or 0-20 mA control. Clicking on this value will display an input box with a drop-down
list from which the user can select either of the two values listed above.
Offset and Range when assigned to a control loop
Inc -- 0 = 4mA, 100 = 20mA
Dec -- 0 = 4mA, -100 = 20mA
Example: if 4 – 20 mA = 800 mV - 1200 mV and PV is Temperature
Offset = 800 (starting point)
Range = 400
Example: if 4 – 20 mA = 800 mV - 1200 mV and PV is O2
Offset = 800 (starting point)
Range = 4000 (400.0)
Example: if 4 – 20 mA = 800 mV - 1200 mV and PV is % Carbon
Offset = 800 (starting point)
Range = 40000 (400.00)
O2 Exponent Range
This menu option will allow the user to set the Oxygen exponent range. The range is 0 to 10.
The 9120 controller has the option of using eight relay outputs. All of the relays have a positive common terminal and
independent negative terminals. All of the relays are configured in a normally closed position except relay number eight,
which has both a normally closed (NC) and a normally open (NO) terminal.