APPENDIX B: ELECTRICAL AND DATA CONNECTIONS
UNIFLOW
®
2 PULSED THERMODE CONTROL
B-2 990-228
Negative/Positive Logic Operation
Your Control is factory-configured for positive logic, active low. That is, when an input terminal is
unterminated, an internal resistor pulls the input terminal to a positive voltage and the input terminal is
considered to be inactive. When a switch connects the input terminal to common, the input terminal is
considered as active.
The voltage source may be supplied by the Control or an external source (see Automation Control Inputs
Connections, page B-15).
You may reverse the logic sense of the inputs to negative logic, active high, by rejumpering connector
J4 on the rear panel. In the rejumpered configuration, an internal resistor pulls an unterminated input
terminal to common and the input is considered as inactive. Supplying 24 volts to the input terminal will
make it become active.
NOTE: For jumper information, see pages B-4 £ B-9.
The inputs that have bipolar logic selection capability are in two groups: Input switches and control
switches. The devices within these groups are as follows:
Input Switches Control Switches
Upper Footswitch
Lower Footswitch
Firing Switch
All other inputs except
HEAT/NO HEAT
PNEUMATIC/ MANUAL
NOTE: The heat/no heat input pull-up/pull-down configuration will change along with the jumper
selection; however, the active sense will not change. Pneumatic/Manual is always positive logic with
pull-up to a positive voltage.
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